Allen Brothers 30mm Dynamic Tii-On Block – High Load (A2030TiiHL)
The Allen Brothers A2030TiiHL is a 30mm single Dynamic Tii-On block upgraded with a stainless steel sheave for higher load applications. Designed for soft attachment using rope or soft shackles, it combines increased load capacity with efficient alignment and low-friction performance.
With a maximum rope diameter of 8mm, it is ideal for modern high-performance control systems where both load handling and weight reduction are important.
Tii-On Soft Attachment with Enhanced Strength
The A2030TiiHL features a stainless steel head loop, specifically designed for soft attachment.
This provides:
- High strength with minimal cheek separation under load
- Reliable load transfer when used with Dyneema® lashings or soft shackles
- Consistent block orientation during use
- A lightweight, low-profile alternative to traditional metal fittings
This design allows the block to align naturally under load, reducing side-loading and improving system efficiency.
Available with or without a soft shackle, it integrates seamlessly into modern rope-based rigging setups.
Stainless Steel Sheave for Higher Load Performance
The High Load configuration includes a stainless steel sheave, delivering:
- Increased working load capability
- Reduced deformation under higher line tension
- Lower friction and faster rolling speeds
- Compatibility with both rope and wire
This makes the A2030TiiHL particularly suited to demanding applications such as:
- Heavily loaded vang systems
- High-load control lines
- Performance setups using high-modulus rope
Dynamic Bearing System for Smooth Operation
At its core, the block uses Allen’s patented Dynamic bearing system:
- Twin rows of stainless steel ball bearings
- Stainless steel bearing rail
This ensures smooth, low-friction sheave rotation, even under repeated adjustment. Compared to systems using plastic bearing races, the stainless-steel rail improves load distribution and long-term durability.
Integrated Becket for Efficient Cascade 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 control systems where efficiency and simplicity are key.
Correct Installation for Maximum Performance
To achieve full strength and performance, correct attachment is essential:
- The attachment line should pass around the central axle and through the head loop
- A crossed or through-threaded configuration is recommended wherever possible
- When using a soft shackle, crossing the load path helps keep the block cheeks compressed
- Non-crossed configurations should only be used in lower load applications
This ensures optimal load distribution and maintains structural integrity under higher loads.
A High Load Soft-Attach Solution for Modern Rigging
The A2030TiiHL builds on the Dynamic platform by combining a stainless steel sheave with a purpose-designed soft attachment system.
For sailors pushing higher loads while adopting modern Dyneema® rigging solutions, it offers a strong, efficient and highly adaptable block for advanced control line systems.
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