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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 rotary actuator is Eckart’s entry-level actuator and is the successor to the popular SM1 series. The E1 works well with low-pressure hydraulic systems with typical pressure ratings of 580 psi (40 bar) – 1,450 psi (100 bar). The E1 rotary actuator functions according to the “helical gear” principle and, due to its compact design, only requires a minimum amount of space while delivering high performance and flexibility.

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.

E1 Hydraulic Rotary Actuator FAQs

Hydraulic Rotary Actuators – E1

Technical Data

Ordering Code

Helical Spline Hydraulic Rotary Actuators:

Hydraulic Rotary-Linear Actuator Standard Features:

Hydraulic Rotary-Linear Actuator Optional Features:

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