Description
SeaSure 25mm Treble Block w/Shackle | Boat Supply Store
Construct reliable purchase systems with the SeaSure 25mm Treble Block and integrated shackle. This block features marine-grade stainless steel side plates and rivets for superior corrosion resistance, complemented by a hard-wearing arnite sheave engineered for longevity under load. With a maximum rope capacity of 8mm and a breaking load of 1250kg, it is a cost-effective component for enhancing mechanical advantage in various marine applications, such as implementing a 6:1 block and tackle system for lifting on smaller vessels.
Key Features
- 25mm sheave diameter for efficient rope travel
- Plain bearing design for simplicity and cost-effectiveness
- Marine-grade stainless steel side plates and rivets ensure durability
- Hard-wearing arnite sheave resists abrasion and UV degradation
- Integrated shackle simplifies attachment to existing rigging
- Maximum 8mm rope capacity suits common sailing lines
- 1250kg breaking load provides substantial safety margin for its class
- Ideal for creating purchase systems to multiply force
Specifications
| Product Specifications | |
|---|---|
| Sheave Diameter | 25mm |
| Bearing Type | Plain bearing |
| Side Plate Material | Marine-grade Stainless Steel |
| Rivets Material | Marine-grade Stainless Steel |
| Sheave Material | Arnite (plastic) |
| Maximum Rope Diameter | 8mm |
| Breaking Load | 1250kg |
| Shackle Included | Yes |
Who This Is For
Sailors and DIY boaters seeking to establish or upgrade their rigging and purchase systems will find this block a practical solution. It's well-suited for individuals needing to create mechanical advantage for tasks like halyard hauling or general lifting on sailboats.
How It Compares
| Feature | SeaSure 25mm Treble Block w/Shackle | Harken |
|---|---|---|
| Sheave Diameter | 25mm | — |
| Bearing Type | Plain Bearing | Ball Bearing |
| Max Rope Diameter | 8mm | — |
| Breaking Load | 1250kg | — |
| Side Plate Material | Marine-grade Stainless Steel | Composite |
| Sheave Material | Arnite (Plastic) | Composite |
| Shackle Included | Yes | No |
Common Concerns Answered
Is a plain bearing block as efficient as a ball bearing block?
While plain bearing blocks like the SeaSure 25mm Treble Block are simpler and more cost-effective, ball bearing systems generally offer lower friction, particularly under very high loads. For most typical purchase systems and general sailing applications, the plain bearing is more than adequate and provides excellent value.
Is the breaking load sufficient for heavy-duty lifting?
The SeaSure 25mm Treble Block has a breaking load of 1250kg, making it suitable for a variety of rigging and lifting tasks on recreational boats, including creating purchase systems. For extremely heavy-duty industrial applications or critical lifting scenarios that exceed this rating, a block specifically designed for those loads would be recommended.
What makes this block a good value for money?
Customers consistently appreciate the durability offered by the marine-grade stainless steel construction and the hard-wearing arnite sheave, combined with the integrated shackle, all at a competitive price point. This makes it an economically sound choice for enhancing a boat's rigging capabilities.
Frequently Asked Questions
What is the maximum rope diameter this block can accommodate?
The SeaSure 25mm Treble Block is designed to accommodate a maximum rope diameter of 8mm.
What is the breaking load of the SeaSure 25mm Treble Block?
The breaking load for this SeaSure 25mm Treble Block is rated at 1250kg.
What materials are used in the construction of this block?
The block features marine-grade stainless steel for its side plates and rivets, and a hard-wearing arnite (plastic) sheave.
Can this block be used for lifting heavier objects?
With a breaking load of 1250kg, this block is suitable for creating purchase systems that multiply force for lifting moderate loads on a sailboat or for general utility. For extremely heavy objects, consult the load rating carefully.
What kind of purchase system can be created with this block?
This treble block is ideal for creating mechanical advantage systems. For example, when used in conjunction with other blocks and a suitable rope, it can form a 6:1 purchase system for lifting halyards or other tasks requiring increased leverage.
