Description
SeaSure 25mm Double Block w/V-Jam | Boat Supply Store
This double block system is engineered to provide superior control and mechanical advantage for running rigging applications. Its construction features marine-grade stainless steel side plates and rivets, ensuring longevity in harsh saltwater environments, and a durable 25mm Arnites sheave capable of handling ropes up to 8mm in diameter. With a breaking load of 1000kg and an integrated V-jammer, it allows for secure locking of the line, making it suitable for establishing efficient 4:1 or 5:1 purchase systems on sailboats or dinghies.
Key Features
- Robust 25mm plain bearing block for versatile rigging
- Durable marine-grade stainless steel side plates and rivets
- Wear-resistant Arnites (plastic) sheave for smooth operation
- Secure V-jammer mechanism for positive rope locking
- Efficient system building for 4:1 or 5:1 purchase ratios
- Compact design with a 1000kg breaking load rating
- Accommodates rope diameters up to 8mm
- Cost-effective solution for essential deck hardware
Specifications
| Product Specifications | |
|---|---|
| Sheave Diameter | 25mm |
| Bearing Type | Plain Bearing |
| Side Plates Material | Marine-grade stainless steel |
| Rivets Material | Marine-grade stainless steel |
| Sheave Material | Arnites (plastic) |
| Maximum Rope Diameter | 8mm |
| Breaking Load | 1000kg |
| Purchase System Capability | 4:1 or 5:1 |
Who This Is For
Sailors and marine enthusiasts requiring a reliable block with integrated rope holding capability for improving sail trim or creating lifting systems. DIY boaters will find this a practical component for rigging and repair tasks.
How It Compares
| Feature | SeaSure 25mm Double Block w/V-Jam | Competitor |
|---|---|---|
| Sheave Diameter | 25mm | — |
| Max Rope Diameter | 8mm | — |
| Breaking Load | 1000kg | — |
| V-Jammer Feature | Yes | No, No |
| Bearing Type | Plain Bearing | Carbo Ratchomatic, Plain Bearing |
Common Concerns Answered
Will the plain bearing be efficient enough for my high-speed halyard?
While this SeaSure block features a plain bearing, optimized for durability and cost-effectiveness, it performs admirably for many common applications. For exceptionally high-speed or high-load operations where maximum efficiency is paramount, roller bearing blocks may offer an advantage, but this block's 1000kg breaking load and robust construction make it suitable for a wide range of rigging tasks.
Can the V-jammer reliably hold my specific rope type?
The V-jammer is designed to securely lock standard marine ropes within its specified diameter range of up to 8mm. Its effectiveness depends on the rope's cover and core construction. For extremely stiff or unusually coated lines, testing in a safe environment is always recommended to ensure optimal grip.
How does this block compare in performance to more expensive options?
This SeaSure block provides excellent value, offering a durable stainless steel and Arnites construction with the critical V-jammer feature at a competitive price point. While higher-end blocks may feature advanced bearing systems or lighter materials for specific racing applications, this model delivers reliable performance and secure rope management essential for cruising and general marine use.
Frequently Asked Questions
What is the maximum rope diameter this SeaSure block can accommodate?
This SeaSure 25mm Double Block w/V-Jam can accommodate a maximum rope diameter of 8mm.
What is the breaking load of the SeaSure 25mm Double Block w/V-Jam?
The breaking load of the SeaSure 25mm Double Block w/V-Jam is 1000kg.
What materials are used in the construction of the SeaSure 25mm Double Block w/V-Jam?
The SeaSure 25mm Double Block w/V-Jam is constructed with marine-grade stainless steel side plates and rivets, and features an Arnites (plastic) sheave.
Can the V-jammer on this block be used to secure a rope?
Yes, the integrated V-jammer on this block is specifically designed to securely lock off ropes, preventing them from slipping under load.
What types of systems can be created using this SeaSure block?
This SeaSure 25mm Double Block w/V-Jam is suitable for creating 4:1 or 5:1 purchase systems, commonly used for halyards, control lines, or lifting applications on various watercraft.
