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Rotary Actuators – HyRAV Rotary Actuator

The HyRAV model is Eckart’s hydraulic quarter-turn valve actuator, built for automating industrial valves in demanding environments. The series covers 12 drive sizes with torque up to 250,000 Nm at 210 bar. Rotation is offered in 0–90°, 120°, or 180°+, with positioning accuracy under 0.5° of full scale. Both double-acting and spring-return (fail-safe) versions are available, with operating times from 0.5 to 200 seconds and fail-safe response as fast as 0.1 seconds.

The valve actuator functions according to the principle of helical gears. The compact and concentric design of the valve has proven to be excellent in practice and provides the customer with space savings as well as reliability. Moreover, the HyRAV series can be applied in the most severe conditions, i.e. from high vibrations to severe environmental locations, and further, provides a powerful, safe solution for automation of valves. Additionally, the series is easily adapted to all types of valves, what is a result of the generous design of the hollow shaft and adaptable flange types.

Advantages at a Glance:

12 drive sizes with torques up to 250,000 Nm at 210 bar
Small dimensions, slim and compact style
Smallest footprint to torque ratio
By concentric design are no radial forces transmitted to the valve
Optimum cushioning protects the valve and actuator
Easy installation and adjustment to each valve
Maintenance free, no lubrication required
Suitable for on/off, control and failsafe operation
High repeat accuracy and very simple control of the flow rates
Extremely trip possible (eg. 90° in 0.2 sec.)
Robust against extreme environmental conditions
Durable against vibrations

Technical Data (Standard – Others on Request)

Valve Actuator Type	Helical gear – double acting or single acting (spring return)
Max. Allowable Operating Pressure	210 bar / 3,045 psi
Min. Operating Pressure Required	5 to 10 bar / 72.5 to 145 psi
Angle of Rotation	Quarter-turn / 0-90º, 120º, or 180º +
Position of Accuracy	< 0.5º of full scale
Medium	Standard hydraulic oil: mineral oil of group
Ambient Temperature	-25 to 70ºC / -13 to 158ºF
Protection Class	IP68
Valve Attachment Flange	EN ISO 5211
Double Acting Lifetime	>100,000 operations
Single Acting Lifetime (Fail-Safe)	Dependent on the desired spring package
Duty Rating	S1 – 100%
Operating Time Range	0.5 sec. to 200 sec.
Max. Speed Fail-Safe	As fast as 0.1 seconds (Dependent on the valve actuator size)
Certificates/Approvals	ATEX, SIL2/3, further in processing/planning, and as required
Materials, Standard	Steel, GGG
Seal Material, Standard	PU / NBR

Applications

Industries	Applications
Power	Power plants (coal, gas, oil, nuclear) Hydro electric power plants Geothermal power plants Solar thermal power plants Biogas power plants
Oil & Gas	Exploration, offshore Refineries Pipelines Tank farms
Water	Steel hydraulics construction Water treatment plants Sewage treatment plants Drinking water disruption
Industrial & Special Solutions	Shipbuilding & submarines Chemical / pharmaceutical industry Food industry Air conditioning Steel mills

Eckart is a supplier and valve rotary actuator manufacturer for various applications including construction, mechanical, marine, and industrial.

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Valve Actuators — HyRAV Rotary Actuator

HyRAV® – valve actuators, tailored perfectly to your needs. HyRAV by Eckart, comprises a full series of double-acting or spring return actuators.

Hydraulic Rotary Actuators — E1

The E1 rotary actuator with an operating pressure of up to 100 bar offers rotary movement with a compact footprint.

Hydraulic Rotary Actuators — E3

The E3 with a maximum operating pressure of 210 bar, is designed for, but not limited to, mobile applications where a flange shaft is desirable.

Hydraulic Rotary Actuators — SM4

The SM4 rotary actuator with an operating pressure of up to 250 bar offers rotary movement with a compact footprint.

Hydraulic Rotary Actuators — HSE4 Rotary-Linear Actuator

HSE4 Rotary-Linear Actuators combine an independently controllable dual acting cylinder with a rotary actuator.

Custom Rotary Actuators

With decades of experience, Eckart GmbH can design and build a quality rotary actuator to your specifications.

Home / Products / Rotary Actuators / Hydraulic Rotary Actuators — E1

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Eckart Overview

Eckart E1 Rotary Actuator

E1 Hydraulic Rotary Actuator FAQs

The E1 is more suited to lower pressure, lightweight applications than the SM4.

The E1 offers higher torque at the same pressure ratings than the SM4, but has a lower maximum pressure rating. Both models are fully customizable, but the SM4 has a maximum pressure rating of 250 bar (3,625 psi), while the E1 has a maximum pressure rating of 100 bar (1,450 psi). The actuator is still capable of precise, backlash-controlled rotation, but has a lower load capacity and a smaller footprint, suitable for light to medium duty systems.

The E1 has a maximum pressure rating of 100 bar (1,450 bar) with standard and custom angle options, meaning virtually any degree of rotation is possible.

E1 actuators offer higher torque for the same pressure ratings when compared to the SM4, but have a lower maximum pressure of 100 bar (1,450 bar). It requires a minimum operating pressure of 5 to 10 bar (72.5 to 145 psi). All standard rotation options are available (including 90º, 180º, 270º, and 360º), but intermediate angles and beyond are available upon request.

Yes, the E1 offers several standard options and can be adapted for additional features on request.

Many E1 customization options are available, including different shaft styles, mounting patterns, and options such as cams, locating pins, and inductive control switches for end-position signaling and simple angle monitoring. For more advanced feedback or special seals, materials, or flange designs, please reach out to our engineering team to confirm what is possible for a specific size.

The E1 offers a torque range of 74 to 2,450 Nm (650 to 21,680 in-lb) depending on size of the piston.

This series offers higher torque at lower pressure ratings compared to the SM4. This means that when both the SM4 and the E1 are running at 100 bar (1,450 psi), the E1 is capable of higher maximum torque of a relative size.

Hydraulic Rotary Actuators – E1

The E1 is Eckart’s entry-level hydraulic rotary actuator, designed for low-pressure systems and the successor to the popular SM1 series. It delivers 654 to 21,684 in-lb of torque across six piston sizes at operating pressures up to 100 bar. It functions with the “helical gear principle” and offers standard rotation in 90°, 180°, 270°, or 360° with intermediate angles or rotations beyond 360° available on request.

While the E1 has a lower maximum pressure rating than the flagship SM4, it produces higher torque at the same pressure. Shaft style, mounting pattern, end cushioning, and position feedback are all configurable.

Technical Data

Angle of Rotation	standard 90º/180º/270º/360º and any intermediate angle, even above 360º
Medium	recommended: mineral oil of group HLP/DIN 51524, page 2 and VDMA page 24318; others on request
Min. Operating Pressure Required	72.5 to 145 psi (5 to 10 bar)
Max. Allowable Operating Pressure	1,450 psi (100 bar) higher on request
Installation Position	as required, provided that adequate air bleeding is provided
Temperature Range	-13ºF to 158ºF (-25ºC to 70ºC) higher or lower on request

Size (Piston-Ø, in mm)	40	50	63	80	100	125
Max Torque at 1,450 psi (100 bar) lbf-in \| [Nm]	654 [74]	1433 [162]	2690 [304]	5204 [588]	11284 [1275]	21684 [2450]
Spec Torque lbf-in/psi \| [Nm/bar]	0.45 [0.74]	0.98 [1.62]	1.85 [3.04]	3.58 [5.88]	7.78 [12.75]	14.95 [24.50]
Absorption Volume / Displacement in^3/1º \| [cm^3/1º]	0.01 [0.17]	0.023 [0.38]	0.045 [0.7]	0.081 [1.43]	0.181 [2.98]	0.358 [5.86]
Max. Admissible Rotation Time per 90º (without load) [s]	0.13	0.18	0.24	0.26	0.43	0.55
Weight ca.* 90º lbs \| [kg]	8.82 [4.0]	14.33 [6.5]	22.05 [10.0]	30.20 [13.7]	52.47 [23.8]	85.98 [39.0]
Weight ca.* 180º lbs \| [kg]	10.14 [4.6]	16.53 [7.5]	26.01 [11.8]	36.16 [16.4]	63.93 [29.0]	105.82 [48.0]
Weight ca.* 270º lbs \| [kg]	11.46 [5.2]	18.74 [8.5]	25.98 [13.6]	42.11 [19.1]	75.40 [34.2]	125.66 [57.0]
Weight ca.* 360º lbs \| [kg]	12.79 [5.8]	20.94 [9.5]	33.95 [15.4]	48.06 [21.8]	86.86 [39.4]	145.41 [66.0]
Max. Radial Load FR lbf \| [KN]	132 [0.589]	418 [1.864]	771 [3.434]	1652 [7.358]	1983 [8.829]	2644 [11.772]
Max. Axial Load FAE lbf \| [KN]	330 [1.472]	550 [2.453]	1101 [4.905]	1983 [8.829]	2644 [11.772]	3966 [17.658]
Max. Axial Load FAA lbf \| [KN]	55 [0.245]	88 [0.392]	132 [0.589]	170 [0.758]	250 [1.117]	330 [1.472]

* Female construction is about 7% lighter

Ordering Code

E1 . 80 – 270º / SZ / Z1 / … / SO

1,450 psi (100 bar) series

Size (Piston-Ø)

Rotation (Standard) – 90º, 180º, 270º, 360º
Other rotations available on request.

Options – Omit for standard

Z1	end cushioning
Z2	±5º adjustable end stop
Z4	long-range adjustable end stop
Z5	cam
Z6	controls witch (ind.)
FL	flange
HW	hollow shaft
SM1	replaceable SM1
SZ	locating pin
ZN	gear hub DIN 5480
ZW	gear shaft DIN 5480

Non-Standard Options – Omit for standard
(Consult factory)

Helical Spline Hydraulic Rotary Actuators:

Our rotary actuators are the helical spline design. This means, a piston and a helix, or sliding spline, work together to convert the linear motion of the piston into rotational motion. Composed of two moving parts and some form of housing, the sliding helical splined gear concept within the actuator is used in many applications where a rotary movement is required. Helical Spline Actuators function when the piston is axially displaced using hydraulic pressure causing simultaneous rotation of the piston. Standard amounts of rotation are 90°, 180°, and 360°; but are available generally up to 720° or more. Additional rotation is created by making the spline gears longer while maintaining the same diameter. The primary benefit to this type of product compared to alternative designs such as linkages using hydraulic cylinders (linear actuators) is its compact design.

Hydraulic Rotary-Linear Actuator Standard Features:

Pressure rating at 1,450 psi (100 bar)

Standard rotation: 90°/180°/270°/360°

5 models of pistons Ø 40 – 125 mm

Adjustable “zero” or home position

Wear resistant slide surfaces

2-Point Bearing

Hydraulic Rotary-Linear Actuator Optional Features:

End cushioning

Rotation adjustable by ±5°

Flange mounting

Foot mounting

Position encoder output

Drive shaft configurations, such as spline shaft, tooth hub, hollow shaft, key shaft, etc.

Custom configurations available

Eckart is a supplier and rotary actuator manufacturer for various applications including construction, mechanical, marine, and industrial.

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Hydraulic Rotary Actuators — E3

The E3 with a maximum operating pressure of 210 bar, is designed for, but not limited to, mobile applications where a flange shaft is desirable.

Home / Products / Rotary Actuators / Hydraulic Rotary Actuators — E3

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Eckart Overview

Eckart E3 Rotary Actuator

E3 Hydraulic Rotary Actuator FAQs

The E3 runs up to 210 bar and covers a wide high torque range.

E3 rotary actuators are rated for 210 bar (3,045 psi) maximum operating pressure and cover a torque range from 400 Nm up to 3,600 Nm (3,540 in-lbs to 31,862 in-lbs) depending on the size of the actuator. Find the exact specifications on our E3 information sheet.

E3 offers 180º and 360º options with a through-hole shaft.

Standard rotation options of the E3 rotary actuator are 180º and 360º. The E3 also has a through-hole shaft as standard so hoses, cables, or safety pins/bolts can pass through. This is especially important for work platforms and similar applications that mount directly onto the actuator.

E3 rotary actuators feature a flange shaft for easy mounting, offer high torque and high bearing capacity, and utilize a very compact package.

The E3 is the most compact actuator in our Eckart line. It features the same helical spline design and high torque, but also offers flange shaft, cantilever style mounting, making it well suited for mobile and off-highway machinery.

The E3 emphasizes low backlash, stable support, and optional counterbalance valves.

Nearly backlash-free spline threads and the bearing design provide a steady working platform. Combined with a counterbalance valve option that can be mounted directly to the ports for load-holding, clamping, and overpressure protection, this makes the E3 suitable where platform stability and operator safety are critical.

Hydraulic Rotary Actuators – E3

The E3 is Eckart’s compact hydraulic rotary actuator for mobile and off-highway applications. It provides 3,540 to 31,862 in-lb of torque across five piston sizes at operating pressures up to 210 bar, with standard rotation in 180° or 360°. Every E3 comes with a flange shaft and through-hole as standard, allowing hoses, cables, or safety pins to pass through the actuator.

While the E3 is dimensionally interchangeable with competing actuators, three design choices set it apart: virtually backlash-free spline threads, zero play in the four-point roller bearing, and the elimination of compact seals that take stress on both sides. The result is a steady, wobble-free working platform even under lateral load.

Technical Data

Min. Operating Pressure Required	145 to 217 psi (10 to 15 bar)
Max. Allowable Operating Pressure	3,045 psi (210 bar)
Temperature Range	-13ºF to 158ºF (-25ºC to 70ºC)

Size (Piston-Ø, in mm)	70	95	125	150	170
Max Torque at 3,045 psi (210 bar) lbf-in \| [Nm]	3540 [400]	6372 [720]	11063 [1250]	22126 [2500]	31862 [3600]
Spec Torque lbf-in/psi \| [Nm/bar]	1.16 [1.90]	2.09 [3.43]	3.63 [5.95]	7.26 [11.90]	10.46 [17.14]
Angle of Rotation (+4º tolerance)	180º / 360º	180º / 360º	180º / 360º	180º / 360º	180º / 270º
Absorption Volume / Displacement in^3/1º \| [cm^3/1º]	0.032 [0.518]	0.057 [0.932]	0.120 [1.962]	0.206 [3.371]	0.306 [5.012]
Weight ca. 180º lbs \| [kg]	21.2 [9.6]	31.7 [14.4]	59.7 [27.1]	94.1 [42.7]	143.3 [65.0]
Weight ca. 360º lbs \| [kg]	27.6 [125]	42.3 [19.2]	81.6 [127.2]	127.2 [57.7]	(270º) 168.9 [76.6 ]
Max. Radial Load FR lbf \| [KN]	1798 [8.00]	4046 [18.00]	8093 [36.00]	9891 [44.00]	13038 [58.00]
Max. Axial Load Fax1 lbf \| [KN]	1798 [8.00]	4046 [18.00]	8093 [36.00]	10341 [46.00]	13038 [58.00]
Max. Axial Load Fax2 lbf \| [KN]	179.9 [0.80]	427.1 [1.90]	831.8 [3.70]	966.7 [4.30]	1326.4 [5.90]
Max. Moment Capacity M	8850 [1000]	22126 [2500]	50449 [5700]	75231 [8500]	106209 [12000]

Silver painted Eckart E3 hydraulic rotary actuator diagram for size and dimensions.

Size (Piston-Ø, in mm)	70	95	125	150	170
Outer Diameter (Ø A)	4.13 [105]	5.31 [135]	6.69 [170]	7.76 [197]	9.06 [230]
Shaft Through Hole (Ø E)	0.51 [13]	0.75 [19]	1.38 [35]	1.81 [46]	2.50 [63.5]
Length (K at 180º)	6.63 [168.4]	6.10 [155]	7.44 [189]	8.82 [224]	10.04 [255]
Length (K at 360º)	9.87 [227.8]	8.39 [213]	10.55 [268]	12.44 [316]	(270º) 12.10 [307.4]

Helical Spline Hydraulic Rotary Actuators:

Our rotary actuators are the helical spline design. This means, a piston and a helix, or sliding spline, work together to convert the linear motion of the piston into rotational motion. Composed of two moving parts and some form of housing, the sliding helical splined gear concept within the actuator is used in many applications where a rotary movement is required. Helical Spline Actuators function when the piston is axially displaced using hydraulic pressure causing simultaneous rotation of the piston. Standard amounts of rotation are 90°, 180°, and 360°; but are available generally up to 720° or more. Additional rotation is created by making the spline gears longer while maintaining the same diameter. The primary benefit to this type of product compared to alternative designs such as linkages using hydraulic cylinders (linear actuators) is its compact design.

Hydraulic Rotary Actuator Standard Features:

Torque output up to 31,800 in-lb (3,600 Nm)

Pressure rating at 3,000 psi (210 bar)

Standard rotation: 180°/360°

Wear resistant slide surfaces

4-Point Bearing

Through-hole (i.e. for cable pass-through)

Hydraulic Rotary Actuator Optional Features:

Integrated valve block

Custom configurations available

Eckart is a supplier and rotary actuator manufacturer for various applications including construction, mechanical, marine, and industrial.

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Custom Rotary Actuators

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Hydraulic Rotary Actuators — HSE4 Rotary-Linear Actuator

HSE4 Rotary-Linear Actuators combine an independently controllable dual acting cylinder with a rotary actuator.

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Hydraulic Rotary Actuators — E3

The E3 with a maximum operating pressure of 210 bar, is designed for, but not limited to, mobile applications where a flange shaft is desirable.

Home / Products / Rotary Actuators / Hydraulic Rotary Actuators — SM4

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Eckart Overview

Eckart SM4 Rotary Actuator — No Flange-Shaft Available

SM4 Hydraulic Rotary Actuator FAQs

The SM4 is rated up to 250 bar (3,625 psi), but can operate efficiently from low pressures.

SM4 rotary actuators are designed for a maximum operating pressure of 250 bar, but their low friction seals allow the rotary actuator to operate from as low as 10 bar (145 psi).

Standard angles include 90º, 180º, 270º, and 360º, with low, configurable backlash.

The SM4 rotary actuator can handle all standard rotations, with any intermediate angle (including >360º) available by limiting or increasing stroke length. Backlash is typically around 20 angular minutes. Custom models are available with backlash down to about 5 angular minutes for higher position accuracy.

The SM4 is designed to handle high radial and axial loads due to its four-point bearing.

The four-point bearing is designed to withstand significant radial and axial loads, making it suitable for applications where the actuator shaft carries the load directly (such as boom pivots or workplatforms). Low axial hydraulic load on the drive shaft (due to a small pressure differential) further protects the bearing and extends service life.

Use standard HLP mineral oil, typically -25ºC to +70ºC (-13ºF to 158ºF), with good filtration.

Hydraulic fluids: SM4 actuators are designed for mineral oil hydraulic fluids of group HLP as per DIN 51524 part 2 (VDMA 24318) with viscosity roughly 16 to 68 cSt in the 40ºC to 60ºC (104ºF to 140ºF) range.

Operating temperature: The typical operating temperature is between -25ºC to +70ºC (-13ºF to 158ºF) given that the above fluid specifications are met.

Filtration Levels: The system should maintain cleanliness better than ISO 4406 class 19/15, typically via ≤25 µm pressure/return filtration.

Hydraulic Rotary Actuators – SM4

The SM4 is Eckart’s flagship hydraulic rotary actuator line, and one of the most configurable units in its category.

Torque ranges from 1,593 to 752,316 in-lb across thirteen piston sizes, with operating pressure up to 250 bar or higher on request. Standard rotation is offered in 90°, 180°, 270°, or 360° as standard with intermediate angles and rotations beyond 720° built to order.

Because of its torque, angle of rotation, pressure range, positioning accuracy, stability of position, type of attachment, and its dimensions, the Eckart SM4 rotary actuator can be used in a wide range of applications. Not only is the SM4 a compact and robust unit, but it is also wear-resistant and efficient. The SM4 can be configured with an industry-leading fine and controllable end cushioning curve. Additionally, the SM4 unit can be driven via “black and white” or with proportional, control, and servo valves. For the purpose of subsequent driving, the piston end-positions at the linear cylinder and at the rotary actuator can be scanned via electronic end-position acknowledgement mechanisms. Ultimately, with the SM4, you have a high-performing product that is both robust and compact, allowing for optimal adaptation depending on your specific requirements. If your application calls for lower pressure, the E1 rotary actuator offers the same range of customization. Need more than the E1 or SM4 can offer? Explore our custom rotary actuators.

Hydraulic Rotary Actuator Standard Features:

Torque output to 750,000 in-lb (85,000 Nm)

Pressure rating at 3,625 psi (250 bar)

Standard rotation: 90°/180°/270°/360°

Externally adjustable end stop ± 5°

Wear resistant moving parts

Four-point contact bearing to withstand extreme radial and axial loads

Adjustable home position

Tight backlash of 20 angular minutes

Hydraulic Rotary Actuator Optional Features:

End cushioning including sophisticated damping curves

Tighter backlash as low as 5 angular minutes

Position indication through encoders or proximity switches

Drive shaft configurations, such as spline shaft, tooth hub, hollow shaft, key shaft, etc.

SM4 Configurations

The SM4 rotary actuator can be customized to your exact application with options like single or dual-end drive shafts, rotation past 360°, reversed turning direction, corrosion-resistant materials and protection suitable for sea or saltwater environments.

Refer to the charts below to configure drive shaft, mounting, valve plate, bottom configuration, and accessories.

Custom drive shaft options for Eckart SM4 hydraulic rotary actuators.

Drive Shaft	Reference
Shaft, smooth
Shaft, with keys
Splined shaft
Gear shaft
Shaft with polygon (conical)
Hollow shaft with keyways
Hollow shaft with gear hub or with multiple- splined hub
Hollow shaft with square end
Flanged shaft (E3 ONLY)

Custom mounting options for Eckart SM4 hydraulic rotary actuators.

Foot Type	Reference
With foot
Flange-flattened
Flange with fixing grooves
Flange according to DIN ISO 5211

Custom valve plate options for Eckart SM4 hydraulic rotary actuators.

Valve Plate Type	Reference
Valve (1) and valve plate (2)
Stop valve plate (1), cushioning plate – all other types of thread possible (2), standard connection bores – all other types of thread possible (3)

Custom accessory options for Eckart SM4 hydraulic rotary actuators.

Accessory Type	Reference
Proximity switch – pressure resistant (to approx. 25º)
Pressure absorber
Measuring connection
Bleed valve with hose liner
Locking screw

Custom bottom options for Eckart SM4 hydraulic rotary actuators.

Bottom Type	Reference
Angle sensor, potentiometer with coupling and mounting housing
Locating pin smooth (A) or locating pin with thread (B), cam (1), clamping ring with proximity switch (c) or clamping ring with mechanical switch
Angular adjustment (ex. from 90º to 180º)
Agraduated adjustment (ex. from 0º to 90º)
With second flange, on base, with foot on base
With large flange at center
With adjusting cylinder for intermediate angles of rotation
With second exit shaft (also possible with the types a to j), see SM4 catalog on pg. 4
With outside square end for manual operation

Technical Data

Angle of Rotation	standard 90º/180º/270º/360º and any intermediate angle, even above 360º
Medium	recommended: mineral oil of group HLP/DIN 51524, page 2 and VDMA page 24318; others on request
Min. Operating Pressure Required	72.5 to 145 psi (5 to 10 bar)
Max. Allowable Operating Pressure	3,625 psi (250 bar) / higher on request
Installation Position	as required, provided that adequate air bleeding is provided
Temperature Range	-13ºF to 158ºF (-25ºC to 70ºC) / higher or lower on request

Size (piston-Ø)	40	50	63	80	100	125	140
Max Torque lbf-in \| [Nm]	1593 [180]	3319 [375]	6505 [735]	11505 [1300]	23896 [2700]	47792 [5400]	74346 [8400]
Spec Torque lbf-in/psi \| [Nm/bar]	0.44 [0.72]	0.92 [1.50]	1.79 [2.94]	3.17 [5.2]	6.59 [10.8]	13.18 [21.6]	20.48 [33.6]
Absorption Volume in^3/1º\| [cm^3/1º]	0.010 [0.170]	0.021 [0.352]	0.041 [0.669]	0.160 [2.624]	0.314 [5.154]	0.477 [7.819]	0.723 [11.846]
Max. Admissible Rotation Time Per 90º (without load) [s]	0.13	0.18	0.24	0.26	0.43	0.55	0.63
Weight ca. 90º lbs \| [kg]	12.13 [5.5]	19.40 [8.8]	25.35 [11.5]	46.30 [21.0]	81 [37]	143 [65]	202 [92]
Weight ca. 180º lbs \| [kg]	13.23 [6.0]	21.16 [9.6]	28.66 [13.0]	50.71 [23.0]	92 [42]	163 [74]	233 [106]
Weight ca. 270º lbs \| [kg]	14.33 [6.5]	22.05 [10.0]	30.86 [14.0]	56.22 [25.5]	103 [47]	185 [84]	264 [120]
Weight ca. 360º lbs \| [kg]	15.43 [7.0]	24.47 [11.1]	34.17 [15.5]	60.62 [27.5]	114 [52]	211 [96]	295 [134]
Max. radial load FR lbf \| [KN]	3250.0 [1.45]	696.9 [3.10]	1079.0 [4.80]	2203.1 [9.80]	3821.7 [17.00]	5745.1 [25.60]	7193.9 [32.00]
Max. radial load FAE lbf \| [KN]	1353.4 [6.02]	2839.5 [12.64]	3299.3 [14.55]	5472.3 [24.35]	8829.9 [39.27]	13785.8 [61.35]	20564.0 [91.50]
Max. radial load FAA lbf \| [KN]	224.8 [1.00]	472.1 [2.10]	854.3 [3.8]	1111.2 [4.95]	1281.4 [5.70]	1550.2 [6.90]	2023.3 [9.00]

Size (Piston-Ø)	160	180	200	225	250	300
Max Torque lbf-in \| [Nm]	113290 [12800]	173475 [19600]	230120 [26000]	303490 [34300]	424836 [48000]	752316 [85000]
Spec Torque lbf-in/psi \| [Nm/bar]	31.25 [51.2]	47.83 [78.4]	63.59 [104.2]	83.66 [137.2]	117.17 [192.0]	207.48 [340.0]
Absorption Volume in^3/1º\| [cm^3/1º]	0.723 [11.846]	1.058 [17.342]	1.466 [24.014]	1.961 [32.162]	2.731 [44.767]	4.821 [79.028]
Max. Admissible Rotation Time Per 90º (without load) [s]	0.73	1.00	1.24	1.50	1.78	2.10
Weight ca. 90º lbs \| [kg]	315 [143]	434 [197]	539 [245]	753 [342]	1190 [540]	2151 [976]
Weight ca. 180º lbs \| [kg]	363 [165]	496 [225]	630 [286]	868 [394]	1399 [635]	2503 [1136]
Weight ca. 270º lbs \| [kg]	412 [187]	588 [267]	720 [327]	983 [446]	1567 [711]	2858 [1296]
Weight ca. 360º lbs \| [kg]	458 [208]	665 [302]	811 [368]	1097 [498]	1757 [797]	3408 [1546]
Max. radial load FR lbf \| [KN]	9350.7 [41.60]	11915.9 [53.00]	14002.7 [62.30]	14634.3 [65.10]	15392.4 [68.50]	19604.6 [87.20]
Max. radial load FAE lbf \| [KN]	28255.1 [125.65]	34914.5 [155.25]	41922.2 [186.50]	42595.6 [189.40]	44539.7 [198.10]	57599.2 [256.25]
Max. radial load FAA lbf \| [KN]	3822.7 [17.00]	4945.8 [22.00]	6069.8 [27.00]	6513.5 [29.00]	7193.9 [32.00]	9216.2 [41.00]

Ordering Code

SM4 . 80 – 270º / SZ / Z1 / … / SO

3,625 psi (250 bar) series

Size (Piston-Ø)

Rotation (Standard) – 90º, 180º, 270º, 360º
Other rotations available on request.

Options – Omit for standard

Z1	end cushioning
Z4	long-range adjustable end stop
Z5	cam
Z6._	controls witch (1-mech. / 2-ind.)
SZ	locating pin
ZW	gear shaft DIN 5480
ZN	gear hub DIN 5480

Non-Standard Options – Omit for standard
(Consult factory)

Helical Spline Hydraulic Rotary Actuators:

Like all Eckart hydraulic rotary actuators, the SM4 is designed with helical spline technology. The actuator operates with a piston and a helical or sliding spline mechanism, which work in tandem to transform the piston’s linear motion into rotational movement.

High torque in a compact profile

Helical spline actuators deliver impressive torque within a compact construction, making them ideal for applications where space is limited.

Less risk of contamination and physical damage

Protective housing keeps all moving parts safe from debris and moisture, ensuring consistent operation in demanding environments, especially for mining applications.

Low maintenance and wear-resistant moving parts

All internal components are fully immersed in oil ensuring preventative wear.

Extended-period nitriding ensures a long service life of the rotary actuator.

Helical gears feature excellent sliding characteristics.

Reduced pinch points

Helical spline rotary actuators offer safer alternatives to linkages for the operator, since there are no exposed parts.

Standard Rotations:

Standard rotations are 90°, 180°, 270°,and 360°. Other rotations can be supplied on request by using the model with the next standard rotation up and limiting the stroke of the piston in accordance. Also available are special models with rotations in excess of 360°. Additional rotation is created by making the spline gears longer while maintaining the same diameter. The primary benefit to this type of product compared to alternative designs such as linkages using hydraulic cylinders (linear actuators) is its compact design.

Eckart is a supplier and rotary actuator manufacturer for various applications including construction, mechanical, marine, and industrial.

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Pneumatic Rotary Actuators — PSM2

The PSM2 Pneumatic Rotary Actuator is most suited to applications in small installation spaces and with low weight requirements.

Custom Rotary Actuators

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Hydraulic Rotary Actuators — HSE4 Rotary-Linear Actuator

HSE4 Rotary-Linear Actuators combine an independently controllable dual acting cylinder with a rotary actuator.

Hydraulic Rotary Actuators — SM4

The SM4 rotary actuator with an operating pressure of up to 250 bar offers rotary movement with a compact footprint.

Hydraulic Rotary Actuators — E3

The E3 with a maximum operating pressure of 210 bar, is designed for, but not limited to, mobile applications where a flange shaft is desirable.

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Eckart Overview

Eckart HSE4 Rotary Actuator-Cylinder

Hydraulic Rotary Actuators – HSE4 Rotary-Linear Actuator

The Eckart HSE4 rotary-linear actuator is a combination of a rotary actuator and a dual-action linear cylinder, allowing for full flexibility in a minimal amount of space. The HSE4 offers torque up to 266,000 in-lb (30,000 Nm), lifting power up to 850,000 N, and operating pressure up to 1,450 psi (100 bar). Consequently, both a rotary movement and a linear movement can be executed even when operated in an extremely small area. Additionally, since the rotary actuator and the linear cylinder are hydraulically-driven separately, any movement sequences can be selected: for example, rotating to the left and right, extending linearly, and retracting.

Furthermore, if both components are driven evenly, then both types of movement will be executed synchronously. The directional valve controls the movement of rod rotation and linear stroking. Because of its torque, angle of rotation, pressure range, positioning accuracy, stability of position, type of attachment, and its dimensions, the Eckart HSE4 rotary actuator can be used in a wide range of applications.

Common applications for the HSE4 include lifting and turning. Not only is the HSE4 a compact and robust unit, but it is also wear-resistant, efficient, and cushioning. Additionally, the HSE4 unit can be driven via “black and white” or with proportional, control, and servo valves. For the purpose of subsequent driving, the piston end-positions at the linear cylinder and at the rotary actuator can be scanned via electronic end-position acknowledgement mechanisms. Ultimately, with the HSE4, you have a high-performing product that is both robust and compact, allowing for optimal adaptation depending on your specific requirements.

Hydraulic Rotary-Linear Actuator Standard Features:

Operating pressure up to 1450 psi (100 bar)

Torques up to 266,000 in-lb (30,000 Nm)

Lifting power up to 850,000 N

4 standard rotation angle 90°/180°/270°/360°

Angle adjustment ± 5°

Wear resistant sliding surfaces

Hydraulic Rotary-Linear Actuator Optional Features:

End cushioning

Locating pin on the end of the shaft

Switching elements for angular interrogation

Various shaft types, such as DIN5480 gear shaft, gear hub, hollow shaft

Special designs according to the request of the customer

Eckart is a supplier and rotary actuator manufacturer for various applications including construction, mechanical, marine, and industrial.

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Hydraulic Rotary Actuators — E1

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Hydraulic Rotary Actuators — E3

The E3 with a maximum operating pressure of 210 bar, is designed for, but not limited to, mobile applications where a flange shaft is desirable.

Hydraulic Rotary Actuators — SM4

The SM4 rotary actuator with an operating pressure of up to 250 bar offers rotary movement with a compact footprint.

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Custom Rotary Actuators

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Eckart Overview

Eckart SM4 Rotary Actuator

Custom Hydraulic Rotary Actuator FAQs

In many cases, custom actuators are based on a modified Eckart model.

After selecting a base Eckart model, a wide variety of aspects can be customized such as bearings, mountings, shaft, or valve blocks.

Pressure, torque/moment, rotation, loads, environment, and any special considerations.

Provide us with operating pressure, required torque and moment, rotation angle, expected side and axial loads, fluid type, temperature range, mounting style, and any special considerations. For example, if the actuator will be subjected to a lot of saltwater or contaminants.

Additional information that may be helpful if it is applicable would be seal compatibility for non-mineral oil based hydraulic fluids, custom mounting requirements, or necessity for position sensors.

Drawings or models of your interface or existing actuator can help this process immensely.

Custom Rotary Actuators

Eckart GmbH is the leader in manufacturing helical-spline hydraulic rotary actuators, with more than 70% of all units shipped as custom orders. All actuators are built to specification in Germany. Customize the rotation angle, operating pressure, mounting style, and drive shaft. Add sensors, end cushioning, certifications (ATEX, DNV, ABS), and protective coatings for maritime environments. Custom angles above 360° and operating pressures above 250 bar (3,625 psi) are available.

With 40 years of experience in the rotary actuator field, Eckart GmbH provides outstanding production quality provided by experienced specialists. Over the decades Eckart GmbH rotary actuator components have gained a firm foothold in automation and drive technology applications.

Tell us about your project and we will present you with a customized optimum solution.

Customizations Built to Your Requirements

1. Drive shaft and bottom configurations

Select from a diverse range of drive shaft options including smooth, rectangular, geared, and more. Additionally, choose from a large selection of bottom configurations.

2. Mounting options

Mounting options include foot or flange with fixing grooves, flattened surfaces, or configurations per DIN ISO 5211.

3. Operating pressure above 250 bar (3,625 psi)

For high force applications, you can configure an actuator rated for operating pressures above 250 bar (3,625 psi).

4. Change of rotation direction

While anti-clockwise rotation is standard, actuators can be specially configured clockwise.

5. Angle adjustment over the entire rotary range

If you need greater extension past the standard ±5º of adjustment, you can equip the actuator with a long-range end stop.

6. Custom and intermediate angles

Standard rotations include 90º, 180º, 270º, and 360º. Intermediate angles can be achieved by adding a spacer within the model’s housing. A 100º actuator, for example, would use a 180º housing. Angles above 360º can also be achieved by making the helical gears longer.

Custom actuator bodies are available for large quantity orders.

7. Position monitoring and feedback

Any position encoders, proximity switch, and sensors for better control, safety, and diagnostics, perfect for automation and testing applications where exact positioning is essential.

8. Additional bearing support

If the actuator is used for supporting loads, additional radial bearing can be added.

9. Direct connection of valves

Valves can be directly mounted to the top of the actuator to provide better control.

10. Modify end cushioning

The cushioning curve is highly customizable to the application and can be fine-tuned by utilizing up to 10 individual orifices plus throttling valves. (Not available for E3, optional other models).

11. Add second drive pivot

A second drive pivot can be added to the base of the actuator. This is useful in tipping applications where the load needs dual support.

12. Additional customizations

Further customizations can include but are not limited to special paints, colors, lake and saltwater resistance, as well as materials options, servo valve mounting plates, port configurations, and various certifications such as ATEX, DNV, ABS, etc.

For the full range of customizations, download the Eckart brochure.

Helical Spline Hydraulic Rotary Actuators:

Our rotary actuators are the helical spline design. This means, a piston and a helix, or sliding spline, work together to convert the linear motion of the piston into rotational motion. Composed of two moving parts and some form of housing, the sliding helical splined gear concept within the actuator is used in many applications where a rotary movement is required. Helical Spline Actuators function when the piston is axially displaced using hydraulic pressure causing simultaneous rotation of the piston. Standard amounts of rotation are 90°, 180°, and 360°; but are available generally up to 720° or more. Additional rotation is created by making the spline gears longer while maintaining the same diameter. The primary benefit to this type of product compared to alternative designs such as linkages using hydraulic cylinders (linear actuators) is its compact design.

Eckart is a supplier and rotary actuator manufacturer for various applications including construction, mechanical, marine, and industrial.

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Hydraulic Rotary Actuators — E3

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Hydraulic Rotary Actuators — SM4

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Eckart Overview

Eckart PSM Pneumatic Rotary Actuator

Pneumatic Rotary Actuators – PSM2

The Eckart PSM2 pneumatic rotary actuator is a heavy-duty pneumatic rotary actuator. The PSM2 offers torque up to 690 in-lb (78 Nm) at a standard operating pressure of 87 psi (6 bar) with a maximum of 145 psi (10 bar). Standard rotation degrees include 90°, 180°, and 360°. Additional advantages of the PSM2 include its wear-resistant sliding surfaces and adjustable drive shaft datum. Ultimately, because of its torque, angle of rotation, pressure range, positioning accuracy, stability of position, type of attachment, and dimensions, the Eckart PSM2 rotary actuator is highly adaptable. With the PSM2, you have a high-performance product that is robust but still compact, allowing for adaptations depending on your specific requirements.

Pneumatic Rotary Actuator Standard Features:

Torque output to 690 in-lb (78 Nm)

Pressure rating at 87 psi (6 bar)

Operating pressure up to 145 psi (10 bar)

Standard Rotation – 90°/ 180° / 360°

Angle adjustment ± 5°

Wear resistant sliding surfaces

Pneumatic Rotary Actuator Optional Features:

Locating pin on the end of the shaft for cams or other control equipment

Proximity switches

Custom configurations available

Eckart is a supplier and rotary actuator manufacturer for various applications including construction, mechanical, marine, and industrial.

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Hydraulic Rotary Actuators — E1

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Hydraulic Rotary Actuators — E3

The E3 with a maximum operating pressure of 210 bar, is designed for, but not limited to, mobile applications where a flange shaft is desirable.

Hydraulic Rotary Actuators — SM4

The SM4 rotary actuator with an operating pressure of up to 250 bar offers rotary movement with a compact footprint.

Hydraulic Rotary Actuators — HSE4 Rotary-Linear Actuator

HSE4 Rotary-Linear Actuators combine an independently controllable dual acting cylinder with a rotary actuator.

Custom Rotary Actuators

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Eckart Overview

Eckart PSM Pneumatic Rotary Actuator

Pneumatic Rotary Actuators – PHSE Rotary-Linear Actuator

The Eckart PHSE pneumatic rotary-linear actuator is a combination of a rotary actuator and a dual-action linear cylinder. It features torque up to 690 in-lb (78 Nm), lifting power up to 7,400 N, and operates at pressures up to 145 psi (10 bar). Standard rotation is offered in 90°, 180°, or 360°. Consequently, with the PHSE, a rotary movement and a linear movement can be executed in an extremely small space, making this compact and robust actuator ideal for many applications. Since the rotary actuator and the linear cylinder are pneumatically-driven separately, any movement sequences can be selected, such as rotating to the left and right, linearly extending and retracting, etc. If both components are driven evenly, then both types of movement will be executed synchronously. For the purpose of subsequent driving, the piston end-positions at the linear cylinder and at the rotary actuator can be scanned via electronic end-position acknowledgement mechanisms. Furthermore, this actuator offers great precision for freely selectable motion sequences. Additional advantages of the PHSE include its wear-resistant sliding surfaces and adjustable drive shaft datum. Ultimately, because of its torque, angle of rotation, pressure range, positioning accuracy, stability of position, type of attachment, and dimensions, the Eckart PHSE rotary-linear actuator is highly adaptable. With the PHSE, you have a high-performance product that is robust but still compact, allowing for adaptations depending on your specific requirements.

Pneumatic Rotary-Linear Actuator Standard features:

Operating pressure up to 145 psi (10 bar)

Torques up to 690 in-lb (78 Nm)

Lifting power up to 7400 N

3 standard rotation angle 90°/180°/360°

Angle adjustment ± 5°

Wear resistant sliding surfaces

Pneumatic Rotary-Linear Actuator Optional features:

Locating pin on the end of the shaft

Switching elements for angular interrogation

Special designs according to the request of the customer