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Allen Brothers  |  SKU: ALNA20403-77

Allen Brothers 40mm Dynamic Triple Block with Swivel and A..77 Cleat

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Sale price $232.40 Regular price $243.83

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DELIVERY AND RETURN INFO

Allen Brothers 40mm Dynamic Triple Block with Swivel and A..77 Cleat

40mm Triple Dynamic Swivel Block With Cam Cleat

The 40mm Triple Dynamic Swivel Block With Cam Cleat is a high-performance, triple-sheave pulley designed for keelboats and dinghies. Manufactured from durable, lightweight glass-loaded nylon and featuring Allen's advanced Dynamic Bearing Technology, it delivers smooth, efficient line handling for mainsheets, jib sheets, spinnaker sheets, and control line systems.

Combining a triple-sheave purchase system, 360° swivel head, and integrated cam cleat, this block is ideal for high-load control applications requiring increased mechanical advantage and secure line adjustment.

Features:

  • Triple-sheave design for high-purchase systems and increased mechanical advantage
  • Manufactured from durable, lightweight glass-loaded nylon
  • Ideal for mainsheet, vang, cunningham, backstay, and keelboat control line applications
  • Patented Dynamic Bearing System featuring twin rows of stainless-steel ball bearings running on a stainless-steel rail
  • Caged ball bearings for reduced friction and enhanced rolling performance
  • Superior load-carrying capability and long service life
  • 360° Swivel Head fitted with a 5mm shackle for flexible attachment and optimal load alignment
  • Shackle is load-rated higher than the block for added reliability
  • Swivel Lock System allows the shackle to be locked in 90° orientations when required
  • Swivel lock can be removed easily by undoing the shackle and removing it from the swivel pin
  • Integrated Cam Cleat provides secure rope holding and quick adjustment of control lines
  • Ideal for applications requiring both purchase and cleating functionality in a compact assembly
  • Low-friction, fast-rolling performance for smooth operation under load
  • Designed for reliable performance in demanding marine environments
  • Perfect for high-load control systems requiring efficient purchase, secure adjustment, and precise line control

Technical Description

Accessories Cleat, Swivel
Bearing Type Dynamic
Configuration Triple
Length 93.35 mm
Height 92 mm
Width 60 mm
Maximum Line Diameter 6 mm
Breaking Load 1400 kg
Maximum Working Load 750 kg
Sheave Material Acetal
Sheave Diameter 40 mm
Pin Size 5 mm
Weight 240 g
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