Hydraulic & Pneumatic Systems
Parker Hydraulics and Pneumatics Ltd, Unit 5, Ashbourne Estate, Mile Cross Lane, Norwich, NR6 6RY

7283Ace MA33-MA64 Shock Absorbers.

Ace Controls


This adjustable shock absorber from ACE is unique. The innovative Ace MA33-MA64 shock absorbers MAGNUM series model provides the next generation of deceleration technology to meet the needs of the future. The latest seal technology , a hardened main bearing and the integrated positive stop provide a significant increase in operating lifetime. Other innovations such as the front and rear adjuster, clamping flanges and the fully threaded outer body provide many new options in installation and mounting. Exploit the advantages of this series in your applications with its 505 increased energy capacity and a much wider effective weight range. The effective weight range extends from 9 kg up to 80 000 kg. The MA range models cover the majority of standard applications, whilst the ML range is specially designed for low velocity/high effective weight applications from 300 kg up to 500 000 kg effective weight.

Adjustment: Turning the front stop collar or rear adjuster towards 0 makes the unit harder. Turning towards 9 makes the unit softer.

Impact velocity range: Type ML: 0.02 up to 0.46 m/s, type MA: 0.15 up to 5 m/s, (up to 20 m/s on request).

Operating Fluid: Automatic Transmission Fluid (ATF) at 42cSt.

Material: Shock absorber body: Nitride hardened steel. Accessories: Steel with black oxide finish or nitride hardened. Piston rod: Steel hardened and chrome plated. Rod end button: Hardened steel with black oxide finish. Return spring: Zinc plated or plastic-coated. For optimum heat dissipation do not paint shock absorber.

Capacity rating: For emergency use only applications, it is sometimes possible to exceed the published max. capacity ratings. Please consult us for further details. If your application exceeds the tabulated W4 figures (max. energy per hour Nm/hr), consider additional cooling. Ask us for further details.

Mounting: In any position.

Operating temperature range: -12° C to 70° C. Higher temperatures, please consult us.

On request: Plated finishes. Weartec finish (seawater resistant), special oils. mounting inside air cylinders and other special options are available on request.

Noise Reduction: 3 to 7 dB when using the impact buttons with urethane insert.

For further information regarding this product or any of our other range of items, please call us on 01603 403 190 or alternatively, email us at sales@parkerhydraulics.co.uk today to request a free quotation or to purchase any of our products.

Part Number Max. Energy Capacity Effective Weight me Min Return Force (N) Max Return Force (N) Rod Reset Time (S)
W3 W4 Self Compensating
Nm/Cycle Nm/H me min. Kg me max. Kg
MA3325EUM 170 75 000 9 1 700 45 90 0.03
MA3350EUM 170 85 000 13 2 500 45 135 0.06
MA4525EUM 390 107 000 40 10 000 70 100 1.14
MA4550EUM 780 112 000 70 14 500 70 145 1.36
MA4575EUM 1 170 146 000 70 15 000 50 180 1.59
MA6450EUM 2 040 146 000 220 50 000 90 155 0.12
MA64100EUM 4 080 192 000 270 52 000 105 270 0.34
MA64150EUM 6 120 248 000 330 80 000 75 365 0.48
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