Allen Brothers 30mm Dynamic Multi-Function Block (A2031)
The Allen Brothers A2031 is a 30mm single Dynamic multi-function block, designed as the foundation for a wide range of block configurations within the 30mm range. With a maximum rope diameter of 8mm, it delivers the same low-friction, fast-running performance as the standard A2030, while offering greater adaptability in system design.
This block forms the core building platform for multiple variations, making it a key component within the Allen Dynamic ecosystem.
Multi-Function Head for System Flexibility
The defining feature of the A2031 is its multi-function head design, which differs from the standard A2030 strap.
This design allows:
- Attachment of swivel, fork, and cheek adaptors
- Integration into multiple block configurations
- Use as the base unit for double and triple blocks
The A2031 is used across a wide range of models, including:
- A2031F (fork head versions)
- A2031SC (swivel versions)
- All corresponding double and triple block assemblies
This makes it an essential building block for more complex control systems.
Dynamic Bearing System for Smooth Performance
At the core of the A2031 is Allen’s patented Dynamic bearing system:
- Twin rows of stainless steel ball bearings
- Stainless steel bearing rail
- Acetal sheave
This configuration provides smooth, low-friction sheave rotation, ideal for systems requiring constant adjustment. Compared to bearing systems running on plastic races, the stainless-steel rail improves load distribution and long-term durability.
Integrated Becket for Compact Systems
The large central rivet acts as a rope-friendly becket, allowing:
- Direct line termination within the block
- Cleaner, more compact cascade systems
- Reduced need for additional fittings
This is particularly useful in multi-part purchase systems where efficiency and simplicity are key.
A Core Component of the 30mm Dynamic Range
The A2031 is not just a standalone block—it is the foundation of many of the more advanced configurations within the Allen 30mm range.
For sailors and riggers building or customising control systems, it provides a flexible, modular solution that maintains consistent performance across a wide variety of setups.
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