Allen Swivel Jammers


Standard Mainsheet Jammer


Allen Standard Mainsheet Jammer


Standard mainsheet jammer.

Allen have spent many hours of research and development with various boat builders to perfect the angle and height of the cleat to optimise mainsheet jamming.

  • Innovative light weight construction,
  • Aluminium arm,
  • Dual ball race for maximum efficiency,
  • Optional click stops limit swivel rotation,
  • Line snags virtually eliminated,
  • Standard and high cleating angles to suit all.
A groove has been created in the arm for the location of the ball bearings;
this design prevents the lateral movement of the arm, significantly improving the play and friction associated with traditional jammers of this format. See diagram.

For use on:-
Sports boat, Keelboat, Etchell, SB3, Finn


Part Description Fixing Hole
Size mm
Centre mm
Max Work
Load Kg.
AL-5166 Standard height M5 19.5 x 19.5 600 368 £162.97 EACH
AL-5166-A Standard height c/w AL-2160 ratchet block M5 19.5 x 19.5 600 484 £205.80 EACH
AL-5166-F Standard height c/w AL-2160-F ratchet fiddle block M5 19.5 x 19.5 600 504 £232.80 EACH

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ISO 9001 logo ProBoat Ltd
Burnham Business Park,
Burnham - on - Crouch,

Phone - +44 (0)1621-785455
E mail - info@proboat.co.uk



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