Allen Brothers 30mm Dynamic Composite Double Cheek Block (A2136M)
The Allen Brothers A2136M is a 30mm double Dynamic composite cheek block, designed for fixed mounting where efficient, low-friction line control is required. With a maximum rope diameter of 8mm, it is ideal for guiding control lines along decks, into cleats, or around corners in more complex multi-part systems.
Built on the proven Dynamic platform, it delivers smooth, reliable performance in applications requiring constant sheave movement.
Double Sheave Design for Increased Control
The A2136M features a twin sheave configuration, allowing:
- Efficient handling of multi-part control lines
- Compact routing of more complex systems
- Improved load distribution across the system
This makes it particularly useful where multiple lines or higher purchase systems need to be managed in a fixed position.
Fixed Composite Cheek Design for Secure Installation
Designed to be mounted directly onto a flat surface, the A2136M offers:
- Stable, low-profile installation
- Reliable performance in fixed positions
- Clean and controlled line routing across the deck
The block is secured using two fixing points:
- One through the centre of the sheave
- One through the countersunk hole in the head of the block
This ensures a strong and dependable connection under load.
Ideal for Deck Line Management
The cheek block format makes the A2136M particularly suited to:
- Leading lines along the deck
- Deflecting lines into cleats
- Managing multiple control lines around corners or fittings
Its fixed design ensures consistent alignment in applications where the lead angle remains relatively constant.
Dynamic Bearing System for Smooth Operation
Each sheave runs on Allen’s patented Dynamic bearing system:
- Twin rows of stainless steel ball bearings
- Stainless steel bearing rail
- Acetal sheaves
This configuration provides smooth, low-friction performance, even under continuous adjustment. Compared to systems using plastic bearing races, the stainless-steel rail improves load distribution and long-term durability.
A Reliable Solution for Fixed Multi-Line Systems
The A2136M combines the efficiency of a double Dynamic block with a robust composite cheek design.
For sailors looking to manage multiple control lines cleanly and efficiently on deck, it offers a durable, low-friction solution within the Allen 30mm Dynamic range.
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