Allen Swivel Jammers


Compact Self-Aligning Mainsheet Jammer


Allen Compact Self-Aligning Mainsheet Jammer

Other products by Allen

Allen Compact Self-Aligning 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 optimize mainsheet jamming.

The Allen A5266 Mainsheet Jammer is designed to prevent the sheet
from wrapping round the block resulting in extra control for faster,
smoother tacks and gybes. By moving the block outward from the swivel and
angling it away from the cleat the mainsheet system creates turning force on the
block and jammer meaning the cleat will always be forced to point away from theboom and towards the helm.

  • Self aligning to windward
  • Smooth rotation
  • Innovative light weight construction.
  • Dual ball race for maximum efficiency.
  • Optional click stops limit swivel rotation.
  • Line snags virtually eliminated.
  • Standard and high cleating angles to suit all.
  • Angle of rotations -  180, 220, 360 
NB: Block not included
Photo of Compact Self-Aligning Mainsheet Jammer
Part Description Fix hole
size mm
Centre mm
Max Work
Weight g
AL-5266-COMP Compact height aluminium arm M5 20 x 20 600






    contact us

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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