Allen Brothers 30mm Dynamic Linked Blocks (A2039)
The Allen Brothers A2039 is a pair of 30mm Dynamic single blocks supplied in a linked configuration, designed for compact and efficient multi-part control systems. Based on the proven A2030 platform, these blocks deliver low-friction, fast-running performance for control lines up to 8mm.
Lightweight and strong, they are ideal for dinghies and performance boats where efficient load handling and clean system layouts are essential.
Linked Block Configuration for Compact Systems
The A2039 features two single Dynamic blocks linked together, allowing:
- Efficient multi-part purchase setups
- Compact system design with reduced spacing between blocks
- Consistent alignment within cascade systems
This configuration is particularly useful where space is limited but multiple sheaves are required.
Built on the Proven A2030 Platform
Each block in the A2039 is based on the standard A2030, known for its:
- Low friction performance
- Fast rolling sheave action
- Lightweight yet strong construction
This makes the linked configuration a natural extension of a widely trusted block design.
Dynamic Bearing System for Smooth Performance
Each sheave runs on Allen’s patented Dynamic bearing system:
- Twin rows of stainless steel ball bearings
- Stainless steel bearing rail
- Acetal sheaves
This ensures smooth, low-friction operation, even under continuous adjustment. Compared to systems using plastic bearing races, the stainless-steel rail improves load handling and long-term durability.
Integrated Becket for System Flexibility
Each block features a large central rivet that acts as a rope-friendly becket, allowing:
- Direct line termination within the block
- Flexible rigging options in cascade systems
- Cleaner and more efficient layouts
A Practical Solution for Multi-Part Control Systems
The A2039 combines the simplicity of single Dynamic blocks with the efficiency of a linked configuration.
For sailors building compact and effective purchase systems, it offers a reliable, low-friction solution that integrates seamlessly into modern rigging setups.
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