Description
SeaSure 25mm Double Block w/Shackle | Boat Supply Store
This SeaSure 25mm double block with shackle is engineered for efficient mechanical advantage in demanding marine environments. Its robust marine-grade stainless steel side plates and rivets ensure exceptional longevity, while the hard-wearing Arnite sheave minimizes friction for smooth operation. With a 1000kg breaking load and a maximum rope capacity of 8mm, it is ideally suited for constructing 4:1 purchase systems for sail control or other rigging applications.
Key Features
- Durable 25mm plain bearing block construction
- Corrosion-Resistant Marine-grade stainless steel side plates and rivets
- Smooth Operation Arnite (plastic) sheave for reduced friction
- Integrated Includes a convenient shackle for immediate use
- Versatile Suitable for creating purchase systems
- Multi-Purpose Can be used for lifting and general mechanical advantage
- Reliable 1000kg breaking load capacity
- Capacity Accommodates up to 8mm rope diameter
Specifications
| Product Specifications | |
|---|---|
| Sheave Diameter | 25mm |
| Bearing Type | Plain Bearing |
| Side Plate Material | Marine-grade Stainless Steel |
| Rivet Material | Marine-grade Stainless Steel |
| Sheave Material | Arnite (Plastic) |
| Shackle Included | Yes |
| Max Rope Diameter | 8mm |
| Breaking Load | 1000kg |
Who This Is For
Sailors and boaters seeking to create efficient rigging systems, as well as DIY enthusiasts requiring a dependable block for lifting or mechanical advantage tasks. This product offers a cost-effective solution for those needing robust marine-grade hardware.
How It Compares
| Feature | SeaSure 25mm Double Block w/Shackle | Becket |
|---|---|---|
| Sheave Diameter | 25mm | — |
| Bearing Type | Plain Bearing | Ball Bearing |
| Max Rope Diameter | 8mm | — |
| Breaking Load | 1000kg | — |
| Shackle Included | Yes | No |
Common Concerns Answered
Will the plain bearing be sufficient for my high-performance sailing needs?
For extremely high-speed or high-load sailing applications where minimal friction is paramount, some users might prefer a ball-bearing system. However, this SeaSure block's plain bearing offers a balance of durability and performance suitable for many recreational sailing and general rigging tasks, providing excellent value.
How durable is the Arnite sheave?
Arnite is a robust, high-performance thermoplastic known for its excellent wear resistance and low coefficient of friction, making it a suitable and durable material for sheaves in marine environments. This contributes to the longevity and reliable performance of the block.
Is this block suitable for heavier loads than standard rigging blocks?
With a breaking load of 1000kg and marine-grade stainless steel construction, this block is designed for significant loads and demanding marine use, providing confidence in its structural integrity for rigging, lifting, and mechanical advantage systems.
Frequently Asked Questions
What is the maximum rope diameter this block can accommodate?
This SeaSure 25mm double block is designed to accommodate a maximum rope diameter of 8mm.
What is the breaking load of the SeaSure 25mm Double Block w/Shackle?
The breaking load for the SeaSure 25mm Double Block w/Shackle is 1000kg.
What materials are used in the construction of this block?
The block features marine-grade stainless steel side plates and rivets, combined with a durable Arnite (plastic) sheave.
Can this block be used for a 4:1 purchase system?
Yes, this 25mm double block is ideally suited for creating 4:1 purchase systems, effectively doubling the mechanical advantage for your rigging needs.
What are some alternative uses for this type of block beyond sailing?
Beyond sailing, this block is versatile for applications such as garage door mechanisms, lifting light loads in workshops, creating storage solutions, or any system requiring a reliable mechanical advantage with a rope.
