Adjustomatic Tensioners, 53-B

Adjusto-Matic Tensioner


The Murray Series 50 Adjusto-Matic is a screw-adjustable tensioner with a spring-loaded pivot arm. The arm maintains tension on the chain or belt and automatically takes up slack due to cyclic loading or wear. The Series 50 Adjusto-Matic offers the user all the advantages of the Adjusto-Screw plus the automatic take-up feature which substantially reduces maintenance.

Constructed of structural steel, the Series 50 Adjusto-Matic is a heavy-duty tensioner available in a wide range of sizes capable of handling RC 40 to RC 200 chain. Its double-coil spring is loaded by turning the adjustment screw in the base of the unit, forcing the idler arm against the slack side of the chain.

On both the Series 50 and 60 tensioners, the pivot arm swings 90┬░from center line in either direction, however, it must be positioned to swing in the direction of the chain (or belt) travel. For reversing drives, the tensioners are used in pairs; one on slack side and one on the tight side.

Available load at idler shaft is the maximum amount of force on the chain developed by the spring loaded arm when deflected 90┬░ to either side of the neutral position.

The basic spring preload is 20% of the total capability. The load curve is a straight line proportion of load to angle of deflection.

Depending on application, please allow a service factor for spring capacity. Springs are shot-peened for longer life.

PLEASE NOTE: Standard lead time for Murray Tensioners is two weeks. Some tensioners are stocked and can be shipped within 24 hours. We also offer expedited services. Please contact us to learn how quickly we can get your parts to you.

Additional information

Weight 27 lbs
Dimensions 24 × 16 × 10 in