Swivel Jammers


Mainsheet Jammers


Other products by Allen

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.
  • 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.
AL-5166 Sports boat, Keelboat, Etchell, SB3, Finn
AL-5166-COMP Fireball, Merlin Rocket, 470, Solo,
Contender, Cadet, Mirror
Photo of Mainsheet Jammers
Part Description Fixing Hole
Size mm
Centre mm
Max Work
Load Kg.
Usage Photo
AL-5166 Standard height aluminium arm M5 20 x 20 600 - - Photo of AL-5166
AL-5166-COMP Compact aluminium arm M5 20 X 20 600 - - Photo of AL-5166-COMP
AL-5166-DUAL Dual Arm with
lower cleat
M5 4 x 20 352 323.5 Etchell, Fireball Photo of AL-5166-DUAL






    contact us

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

Phone - +44 1621 78 54 55
Fax - +44 1621 78 54 67
E mail - info@proboat.co.uk



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We reserve the right to alter specifications without notice. The purchaser is responsible for choosing the correct product for it's particular application.
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