Allen Brothers 30mm Dynamic Triple Block with Inverted Cleat (A2034-676)
The Allen Brothers A2034-676 is a 30mm triple Dynamic block with an integrated inverted cam cleat, designed for high-efficiency purchase systems where control and line holding are required in a single unit. With a maximum rope diameter of 8mm, it is ideal for demanding control systems on dinghies and performance boats.
This configuration is commonly used where higher mechanical advantage and precise adjustment are essential.
Triple Sheave Design for Maximum Purchase
The A2034-676 features a three-sheave configuration, making it ideal for:
- Cunningham systems
- Kicker / vang cascades
- High-load purchase systems requiring increased mechanical advantage
The triple layout allows greater load reduction within the system, making adjustments easier under load.
Inverted Cam Cleat with Pro-Lead
This block is fitted with an A.676 Allenite cam cleat in an inverted orientation, complete with a pro-lead.
This provides:
- Secure rope holding directly at the block
- Clean system termination without additional hardware
- Improved line entry into the cleat for reliable engagement
The inverted cleat position is ideal for setups where the control line needs to be led downwards or managed from above.
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 low-friction, fast-running performance, even under continuous adjustment. Compared to systems using plastic bearing races, the stainless-steel rail improves load handling and long-term durability.
Ultra-Strap Construction for Strength and Reliability
The A2034-676 features Allen’s patented Ultra-Strap, manufactured using a coining process to enhance strength and durability.
This results in:
- A stronger, more hard-wearing stainless steel strap
- Improved reliability under load
- A rope-friendly profile suitable for modern rigging setups
Originally developed for rope attachment, the Ultra-Strap allows for flexible rigging options across a wide range of applications.
An Integrated Solution for High-Load Control Systems
The A2034-676 combines a triple sheave block with an integrated cleat, creating a compact and efficient solution for complex control systems.
For sailors looking to maximise purchase while maintaining clean and manageable layouts, it offers a reliable, low-friction option within the Allen 30mm Dynamic range.
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