Allen 40mm Single Block with Removeable Strap

The Allen 40mm Single Block with Removable Ultra Strap is a lightweight, high-performance sailing block designed for dinghies, keelboats, sports boats, and a wide range of marine control line applications. Manufactured from high-strength glass-loaded nylon and incorporating Allen’s renowned Dynamic Bearing System, this block delivers exceptional efficiency, durability, and load-carrying performance in demanding sailing conditions.

Designed for use on mainsheets, jib sheets, spinnaker sheets, and control lines, the 40mm sheave provides smooth rope handling and reduced friction, helping sailors achieve precise sail trim and effortless line management. The removable Ultra Strap attachment offers versatile installation options while maintaining strength and reliability.

Allen’s patented Dynamic Bearing Technology features twin rows of stainless-steel ball bearings running on a stainless-steel race, providing smooth operation under load and excellent long-term performance. The caged bearing design further reduces friction and wear, making this block ideal for both racing and cruising applications.

The patented Ultra Strap system undergoes a specialised coining process that strengthens the stainless-steel strap while creating a rope-friendly profile. This innovative design improves durability, reduces wear on running rigging, and offers a secure attachment point for a variety of deck layouts and rigging systems.

Whether you’re upgrading your dinghy rigging, replacing worn hardware, or optimising a keelboat control system, the Allen 40mm Dynamic Block delivers reliable performance and proven sailing efficiency.

Features

• Genuine Allen Brothers 40mm Dynamic Single Block
• High-strength glass-loaded nylon construction
• Lightweight design for reduced rigging weight
• Removable Ultra Strap attachment system
• Allen patented Dynamic Bearing Technology
• Twin rows of stainless-steel ball bearings
• Stainless-steel bearing race for smooth operation
• Low-friction performance under high loads
• Excellent load-carrying capability
• Corrosion-resistant marine-grade components
• Rope-friendly Ultra Strap design
• Suitable for mainsheets, jib sheets, spinnaker sheets and control lines
• Ideal for dinghies, keelboats, sports boats and small yachts
• Designed for both racing and cruising applications
• Durable construction for long service life in harsh marine environments

Applications

• Mainsheet systems
• Jib sheet systems
• Spinnaker sheet systems
• Cunningham controls
• Outhaul systems
• Kicker and vang controls
• General sail control line applications

Specifications

• Sheave Diameter: 40mm
• Maximum Rope Diameter: 10mm
• Length: 64mm
• Safe Working Load: 240kg
• Breaking Load: 700kg
• Material: Glass-loaded nylon with stainless-steel bearings and race
• Attachment Type: Removable Ultra Strap

Why Choose Allen Dynamic Blocks?

Allen Dynamic Blocks are trusted by sailors worldwide for their exceptional reliability, low-friction performance, and innovative bearing technology. The combination of lightweight construction, superior load handling, and marine-grade durability makes the Allen 40mm Single Block an excellent choice for both competitive sailors and recreational boat owners.

Upgrade your rigging with the Allen 40mm Single Block with Removable Ultra Strap and experience smooth, efficient sail control on every voyage.