Allen Brothers 30mm Dynamic High Load Block – Back to Back (A2038HL)
The Allen Brothers A2038HL is a 30mm High Load back-to-back Dynamic block, designed to handle opposing control lines under higher loads. Featuring twin stainless steel sheaves mounted in opposite directions, it allows lines to operate at up to 180 degrees to each other while maintaining smooth, low-friction performance.
With a maximum rope diameter of 8mm, it is a compact and highly capable solution for demanding performance systems.
Back-to-Back Configuration for Opposing Loads
The A2038HL features two sheaves facing in opposite directions, allowing:
- Two independent control lines to run up to 180° apart
- Efficient handling of opposing loads within a single block
- Clean and compact rigging layouts
This configuration is particularly effective in systems where space is limited and load paths diverge.
Stainless Steel Sheaves for Higher Load Performance
The High Load version is fitted with stainless steel sheaves, delivering:
- Increased working load capability
- Reduced deformation under high line tension
- Lower friction and faster rolling speeds
- Compatibility with both rope and wire
This makes it ideal for applications where higher loads are present on both lines.
Reinforced Construction for Opposing Load Stability
The block is built with a strong stainless steel side strap and durable nylon mouldings, ensuring:
- Structural integrity under high opposing loads
- Resistance to separation even under extreme tension
- Long-term durability in demanding environments
The central design also allows the block to be tied around its middle in a slight V shape, increasing versatility in complex rigging systems.
Ideal for Specialist High-Load Applications
The A2038HL is particularly suited to:
- Triangle backstay systems on sports boats
- Dual pole and spinnaker launcher systems (e.g. 49er setups)
- High-load opposing control line systems
Its robust design and increased load capability make it a reliable choice for advanced performance setups.
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
This ensures smooth, low-friction performance, even under higher loads. Compared to systems using plastic bearing races, the stainless-steel rail improves load distribution and long-term durability.
A High Load Solution for Advanced Rigging Systems
The A2038HL combines the versatility of a back-to-back configuration with the strength of stainless steel sheaves.
For sailors managing opposing high-load control lines, it offers a strong, efficient and highly adaptable solution within the Allen 30mm Dynamic range.
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