40MM QUADRUPLE BLOCK

A20404 – 40mm Dynamic Quadruple Swivel Block | Lightweight High-Performance Block for Keelboats & Dinghies

The A20404 40mm Dynamic Quadruple Swivel Block is built from high-strength, lightweight glass-loaded nylon and combines Allen's renowned dynamic bearing technology to deliver a high-performance block perfectly suited for keelboats and dinghies.

Ideal for use on main, jib and spinnaker sheets on dinghies, as well as keelboat control lines, the 40mm Dynamic range offers the perfect balance of strength, weight and performance.

Patented Bearing System – Dynamic Block Technology Dynamic Blocks feature an exclusive patented bearing system using twin rows of stainless-steel ball bearings running on a stainless-steel rail. The ball bearings are caged for further friction reduction, delivering superior load-carrying capacity and outstanding longevity compared to conventional bearing systems on the market.

Swivel Head – 360° Rotation with Rated 4mm Shackle The block features a 360-degree swivel head fitted with a 4mm shackle that is load rated higher than the block itself — compact but more than strong enough for demanding conditions.

Becket – Versatile Tie-Off Point The 40mm range features a large central hole that doubles as a becket tie-off point. Specific becket variations are also available for dedicated applications.