Allen 40mm Dynamic Ball Bearing Blocks


40mm Triple Block Swivel Head Becket & Cleat


Allen 40mm Triple Block Swivel Head Becket & Cleat


40mm Triple Block Swivel Head Becket & AL-0077 Cleat

Made from high-strength, lightweight glass-loaded nylon and featuring Allen’s dynamic bearing technology for a high-performance block suitable for keelboats and dinghies.

40mm dynamic blocks are perfect for use on main, jib and spinnaker sheets on dinghies and keelboat control lines.

Bearings – Dynamic blocks feature Allen patented bearing system which uses twin rows of stainless-steel ball bearings running on a stainless-steel rail. The ball bearings are caged for further friction reduction. These features provide a superior load-carrying ability and longevity when compared to other bearing systems.

Swivel Head – Featuring a 360-degree swivel head with a 4mm shackle.
The shackle is load rated higher than the block, so although it might look small, it’s plenty strong enough!

Swivel Lock – This block comes with a swivel lock moulding. The moulding allows the shackle to be locked in 90-degree orientations. It can be removed by undoing the shackle and removing it from the swivel pin.

Becket – This block has a specific becket (tying) moulding. The becket allows you to make a purchase system. Ideal for backstay. cunningham, outhaul and vang controls.

Cam Cleat – The AL-0077, small aluminium cam cleat, is mounted to an adjustable stainless steel arm. The arm can be adjusted to suit your sheeting angle by simply loosening the nut and bolt through the centre of the block, loosening the side plates and retightening everything at the required angle.


Part Description Length
Line Ø
Shackle Pin
Load Kg
Max Work
Load Kg
AL-20403-B-77 Triple block swivel head becket & AL-0077 cleat 109 6 5 1400 750 242 £202.79 EACH






contact us

ProBoat Ltd
Burnham Business Park,
Burnham - on - Crouch,

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



Although great care is taken to ensure the information in this website is accurate, all information is given for guidance only and is not contractual.
We reserve the right to alter specifications without notice. The purchaser is responsible for choosing the correct product for it's particular application.
All goods are supplied according to our conditions of sale.