We use cookies, which are small text files, to improve your experience on our website and to show you personalised content. You can allow all or manage them individually. You can find out more on our Cookie Page at any time.

Skip to Content

🎄 Our Christmas Shop Is Open →

Boat Care & Maintenance
Books & Gifts
- View All
- Books
- Charts
- Gift Ideas
- Calendars
- DVDs
- Model Boats
Chandlery
Clothing
Boat Covers
Sails
- View All
- Sail Accessories
- Enterprise
- Fireball
- Flying Fifteen
- GP14
- Heron
- Laser
- Laser 2
- Laser Pico
- Mirror
- Miracle
- National 12
- Optimist
- RS Feva
- Sport 14
- Streaker
- Topper
- Topper Topaz Sails
- Wayfarer
Trailers & Trollies
Dinghy Classes
Customer Services

Sign In Create an Account

Boat Care & Maintenance
Books & Gifts
Chandlery
Clothing
- Buoyancy Aids & Lifejackets Dinghy Tops Drysuits Footwear Gloves Hats & Caps Hifits / Waterproof Trousers Holdall, Kit Bags & Dry Bags Knee Pads Rash Vests Sunglasses Thermalwear Trapeze Harness Watches
- Wetsuits Clothing Maintenance Sailing Knives Accessories
Boat Covers
- Dinghy Boats Covers
  
  See All Dinghy Boat Covers
  
  Inflatable Dinghy Covers
  
  Made To Measure Boat Covers
  
  Spares And Maintenance
- Popular Boat Covers
  
  Falmouth Bass Boat Covers
  
  GP14 Boat Covers
  
  Heron Boat Covers
  
  Laser Boat Covers
  
  Laser 2 Boat Covers
  
  Laser 2000 Boat Covers
  
  Laser Pico Boat Covers
  
  Mirror Boat Covers
  
  Optimist Boat Covers
  
  RS200 Boat Covers
  
  RS Aero Boat Covers
  
  RS Feva Boat Covers
  
  RS Tera Boat Covers
  
  Scow Boat Covers
  
  Topper Boat Covers
  
  Wanderer Boat Covers
  
  Wayfarer Boat Covers
Sails
Trailers & Trollies
Dinghy Classes
- Enterprise Catalogue GP14 Catalogue Laser & ILCA Catalogue Mirror Catalogue Optimist Catalogue RS200 Catalogue RS Feva RS Tera Topaz Catalogue Topper Catalogue Wayfarer Catalogue
Customer Services

Search

Loading...

FREE SHIPPING
Free for most orders over £100*
UK Manfacturing
Manufacturing and Repairs in the UK
Free Returns*
Free Royal Mail returns, conditions apply
Feefo Reviews
2800+ positive reviews

My Cart

Loading...

Customer Login

Checkout using your account

Email Address

Password

Forgot Your Password?

Checkout as a new customer

Creating an account has many benefits:

See order and shipping status
Track order history
Check out faster

Create an Account

Home
Chandlery
Blocks
Allen Blocks
Allen 20mm Dynamic Blocks

Shop By

Active filtering (1)

Brand Allen

Brand

Allen

Sheave Size (mm)

18-21mm

Block Type

Single
Double
Triple

Block Options

Becket
Becket Through Axle
Cam Cleat

Attachment Method

Cheek Block
Fixed Head
Hook
Removable Head
Rope
Shackle
Stand Up Base
Surface Mount
Swivel
Through Deck

Bearing Type

Ball Bearing

Pin Diameter (mm)

3
4

Price

£0.00 - £100.00
£100.00 - £200.00

On Sale

On Sale

Allen - Allen 20mm Dynamic Blocks

Shop By

Allen 20mm Dynamic Block

£15.24
Allen 20mm Dynamic Ezi-Tii Block

£15.24
Allen 100mm X 1.5mm Type 2 Dyneema Soft Shackle

£14.27
Allen 20mm Extreme High Load Block Blue

Special Price £117.25 Regular Price £134.14

-13%
Allen 20mm Dynamic Block On Saddle And Spring

£24.83
Allen 20mm Dynamic Block With Swivel Shackle Head

£37.28
Allen 20mm Dynamic Composite Cheek Block

£24.61
Allen 20mm Dynamic Cheek Block

£22.30
Allen 20mm Micro Through Deck Or Stand Up Block

£22.07
Allen 20mm Multi Function Dynamic Block

£14.12
Allen 20mm Dynamic Block With Fork Head

£23.68
Allen 20mm Dynamic Hook Block

£22.98
Allen 20mm Dynamic Block And Swivel Fork Head

£33.88
Allen 20mm Dynamic Double Block

£37.36
Allen 20mm Dynamic Double Block And Becket

£39.34
Allen 20mm Dynamic Triple Block

£53.84
Allen 20mm Dynamic Triple Block And Becket

£59.51
Allen 20mm Dynamic Triple Block, Cleat & Becket

Special Price £111.90 Regular Price £128.47

-13%
Allen 20mm Dynamic Back to Back Block

£33.50
Allen Micro Through Deck Block With 20mm Sheave

£30.24
Allen 20mm Micro Through Deck Block

£26.20

21 Items

Show

We’re happy to help

View our advice centre, read about our services, get the information you need or get in touch with any question you might have.

Follow us

About Us

Our Story
Manufacturing in the UK
Meet the Team
Supplying Sailing Clubs, Scouts and Schools
Working with Industry
Feefo Reviews
Green Policy
Contact Us

Customer Services

My Account
Order Status
Shipping Charges
International Shipping and Customs
Returns & Exchanges
Multi Buy Discounts

Info

Privacy Policy
Opening hours
Cookies
Terms & Conditions

Visit TridentUK Store

Trident Quay
6 South Shore Road
Gateshead
Tyne And Wear
NE8 3AE
0191 4901736
Get Directions

Family owned and run business
Manufacturing in Gateshead, UK
Since 1986
Passionate about sailing

Privacy Policy | Terms & Conditions

Loading...

Loading...