1 1

A20404

40mm Quad Dynamic Block

40mm Quad Dynamic Block

£153.56 ex VAT £184.27 inc VAT
ex VAT £0.00 inc VAT £153.56 ex VAT £184.27 inc VAT
Sale Sold out
Shipping calculated at checkout.

Low stock - 5 left(Can be backordered)

Require larger quantities? Contact us

Stockists

Delivery

Fast UK delivery from £4.50 or FREE when spending over £100.
More Info

View full details
Product Datasheet Download Product Datasheet Download

Description

40mm Quad Dynamic Swivel Block

The 40mm Quad Dynamic Swivel Block is a high-performance, four-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 high-purchase control systems.

Ideal for applications requiring significant mechanical advantage, such as vangs, backstays, mainsheets, and other high-load control systems.

Key Features

  • Quad-sheave design for high-purchase systems and maximum mechanical advantage
  • Manufactured from durable, lightweight glass-loaded nylon
  • Ideal for mainsheet, vang, backstay, and keelboat control line applications
  • Patented Dynamic Bearing System with 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
  • 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
  • Designed for smooth, reliable performance in demanding marine environments
  • Ideal for high-load purchase systems requiring efficient line handling and compact rigging solutions
Accessories Swivel
Bearing type Dynamic
Brand Allen
Breaking load kg 1400
Configuration Quad
Height mm 82
Iges file link https://abassets.ams3.digitaloceanspaces.com/iges/a20404.igs
Length mm 95.05
Maximum line diameter mm 10
Maximum working load kg 750
Pdf GenericFileDrop
Pdf ref link https://abassets.ams3.digitaloceanspaces.com/product_files/a20404-ref_2.pdf
Pin size mm 5
Related collection CollectionDrop
Width mm 80
Swipe
SKU Title Breaking Load Kg Max Working Load Kg Hole Pitch mm Length mm Max Line Dia mm Pin Size mm Weight (g) Price
A20401S-2030

40 & 30mm Single Dynamic Blocks - Linked

 780 140 - 108 8 - 64
£50.72 ex VAT £60.86 inc VAT
ex VAT £0.00 inc VAT £50.72 ex VAT £60.86 inc VAT
A20402

40mm Double Dynamic Block

 1150 500 - 93.55 10 5 100
£76.79 ex VAT £92.15 inc VAT
ex VAT £0.00 inc VAT £76.79 ex VAT £92.15 inc VAT
A20402B

40mm Double Dynamic Block - Becket

 1150 500 - 110.05 10 5 113
£78.88 ex VAT £94.66 inc VAT
ex VAT £0.00 inc VAT £78.88 ex VAT £94.66 inc VAT
A20404

40mm Quad Dynamic Block

 1400 750 - 95.05 10 5 213
£153.56 ex VAT £184.27 inc VAT
ex VAT £0.00 inc VAT £153.56 ex VAT £184.27 inc VAT
A20401

40mm Single Dynamic Block

 780 240 - 83.38 10 4 54
£38.39 ex VAT £46.07 inc VAT
ex VAT £0.00 inc VAT £38.39 ex VAT £46.07 inc VAT
A20401B

40mm Single Dynamic Block - Becket

 780 240 - 99.88 10 4 59
£40.48 ex VAT £48.58 inc VAT
ex VAT £0.00 inc VAT £40.48 ex VAT £48.58 inc VAT
A20401B-77

40mm Single Dynamic Block - Becket, Cleat

 780 80 - 99.88 6 4 122
£94.14 ex VAT £112.97 inc VAT
ex VAT £0.00 inc VAT £94.14 ex VAT £112.97 inc VAT
A20401BF

40mm Single Dynamic Block - Becket, Fiddle

 780 240 - 126.88 10 4 73
£57.39 ex VAT £68.87 inc VAT
ex VAT £0.00 inc VAT £57.39 ex VAT £68.87 inc VAT
A20401BF-77

40mm Single Dynamic Block - Becket, Fiddle, Cleat

 780 80 - 126.88 6 4 141
£109.55 ex VAT £131.46 inc VAT
ex VAT £0.00 inc VAT £109.55 ex VAT £131.46 inc VAT
A20401BFH-77

40mm Single Dynamic Block - Becket, Fiddle, Hook, Cleat

 540 80 - 153 6 4 172
£114.77 ex VAT £137.72 inc VAT
ex VAT £0.00 inc VAT £114.77 ex VAT £137.72 inc VAT
A20401C

40mm Single Dynamic Block - Cheek

 780 240 35.5 62 10 - 36
£35.54 ex VAT £42.65 inc VAT
ex VAT £0.00 inc VAT £35.54 ex VAT £42.65 inc VAT
A20401CB

40mm Single Dynamic Block - Cheek, Becket

 780 240 62.5 X 14.6 73 10 - 41
£37.63 ex VAT £45.16 inc VAT
ex VAT £0.00 inc VAT £37.63 ex VAT £45.16 inc VAT
A20401-77

40mm Single Dynamic Block - Cleat

 750 80 - 83.38 6 4 118
£92.07 ex VAT £110.48 inc VAT
ex VAT £0.00 inc VAT £92.07 ex VAT £110.48 inc VAT
A20401F

40mm Single Dynamic Block - Fiddle

 780 240 - 108.38 10 4 68
£50.96 ex VAT £61.15 inc VAT
ex VAT £0.00 inc VAT £50.96 ex VAT £61.15 inc VAT
A20401F-77

40mm Single Dynamic Block - Fiddle, Cleat

 780 80 - 108.38 6 4 136
£104.58 ex VAT £125.50 inc VAT
ex VAT £0.00 inc VAT £104.58 ex VAT £125.50 inc VAT
A20401H

40mm Single Dynamic Block - Hook

 540 250 - 109 10 - 73
£43.60 ex VAT £52.32 inc VAT
ex VAT £0.00 inc VAT £43.60 ex VAT £52.32 inc VAT
A20401BFH

40mm Single Dynamic Block - Hook, Becket, Fiddle

 540 240 - 153 6 4 91
£62.60 ex VAT £75.12 inc VAT
ex VAT £0.00 inc VAT £62.60 ex VAT £75.12 inc VAT
A20401FH

40mm Single Dynamic Block - Hook, Fiddle

 540 240 - 134 6 4 86
£56.18 ex VAT £67.42 inc VAT
ex VAT £0.00 inc VAT £56.18 ex VAT £67.42 inc VAT
A20401FH-77

40mm Single Dynamic Block - Hook, Fiddle, Cleat

 540 80 - 134 6 4 154
£109.80 ex VAT £131.76 inc VAT
ex VAT £0.00 inc VAT £109.80 ex VAT £131.76 inc VAT
A20401SR

40mm Single Dynamic Block - Removable Strap

 700 240 - 64 10 - 41
£37.55 ex VAT £45.06 inc VAT
ex VAT £0.00 inc VAT £37.55 ex VAT £45.06 inc VAT
A20401SLZ

40mm Single Dynamic Block - Stand Up

 700 240 36.25 74 10 - 45
£38.88 ex VAT £46.66 inc VAT
ex VAT £0.00 inc VAT £38.88 ex VAT £46.66 inc VAT
A20401S

40mm Single Dynamic Block - Strap

 700 240 - 64.5 10 - 41
£33.74 ex VAT £40.49 inc VAT
ex VAT £0.00 inc VAT £33.74 ex VAT £40.49 inc VAT
A2040Tii

40mm Single Dynamic Block - Tii-On

 800 180 - 58 10 - 36
From £33.74 ex VAT £40.49 inc VAT
ex VAT £0.00 inc VAT From £33.74 ex VAT £40.49 inc VAT
A20401HL

40mm Single High Load Block

 780 360 - 83.38 10 4 77
£59.18 ex VAT £71.02 inc VAT
ex VAT £0.00 inc VAT £59.18 ex VAT £71.02 inc VAT
A20401CHL

40mm Single High Load Block - Cheek

 780 360 35.5 62 10 - 54
£54.85 ex VAT £65.82 inc VAT
ex VAT £0.00 inc VAT £54.85 ex VAT £65.82 inc VAT
A20401SRHL

40mm Single High Load Block - Removable Strap

 700 360 - 64.5 10 - 64
£56.45 ex VAT £67.74 inc VAT
ex VAT £0.00 inc VAT £56.45 ex VAT £67.74 inc VAT
A2040TiiHL

40mm Single High Load Block - Tii-On

 800 360 - 58 10 - 41
£54.50 ex VAT £65.40 inc VAT
ex VAT £0.00 inc VAT £54.50 ex VAT £65.40 inc VAT
A2040XHL-B

40mm Single XHL Block

 1500 650 - 54 8 - 73
£161.40 ex VAT £193.68 inc VAT
ex VAT £0.00 inc VAT £161.40 ex VAT £193.68 inc VAT
A20403

40mm Triple Dynamic Block

 1400 750 - 93.35 10 5 159
£115.18 ex VAT £138.22 inc VAT
ex VAT £0.00 inc VAT £115.18 ex VAT £138.22 inc VAT
A20403B

40mm Triple Dynamic Block - Becket

 1400 750 - 110.05 10 5 163
£117.20 ex VAT £140.64 inc VAT
ex VAT £0.00 inc VAT £117.20 ex VAT £140.64 inc VAT
A20403B-77

40mm Triple Dynamic Block - Becket, Cleat

 1400 750 - 110.5 6 5 240
£183.50 ex VAT £220.20 inc VAT
ex VAT £0.00 inc VAT £183.50 ex VAT £220.20 inc VAT
A20403-77

40mm Triple Dynamic Block - Cleat

 1400 750 - 93.35 6 5 240
£181.47 ex VAT £217.76 inc VAT
ex VAT £0.00 inc VAT £181.47 ex VAT £217.76 inc VAT
ATII-LOCK-40

Tii-Lock-40

 - - - - - - -
£3.75 ex VAT £4.50 inc VAT
ex VAT £0.00 inc VAT £3.75 ex VAT £4.50 inc VAT