Allen Aluminium Arm Mainsheet Swivel Jammer

Special Price £128.25 Regular Price £142.50
In stock
The A5166 suits large dinghies and features an aluminium arm with alloy A..76 cleat.


Allen Brothers A5166 Aluminium arm mainsheet swivel jammer suits large dinghies and the range uses an updated bearing system which has a ball locating groove for smooth rotation whilst preventing the lateral movement of the arm. The angle and height of the cam cleat has been carefully designed to optimise mainsheet jamming and release when required. The angles of rotation can be set to 180, 220 or 360 degrees.

Allen's design team spent many hours of research and development improving the range of their aluminium mainsheet jammers.


  • Fixing Centres: 20 x 20mm
  • Max Load 600Kg
  • Fixing Hole Size: M5
  • Limit rotation to 180, 220 or 360 degrees.

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SKU AL-A5166

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  1. Jon bowler asks 1 Jan 1970

    What diameter main sheet will pulley take

    1. David Shilling answers 19 Sep 2017

      Hi Jon,
      The block and the cleat have a maximum line size of 10mm.
      I hope that helps

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