Single block 22-40mm | Master Windrider
Windrider is a series of ball-bearing blocks designed with competitive sailing in mind, but they are also an affordable option for the cruising sailor. The high-performance composite side plates are designed to ensure optimal performance even under high loads. The blocks have high weather resistance, which prevents the blocks from failing in all types of sailing conditions and ensures long-lasting durability.
AREA OF APPLICATION
The single block is suitable for mainsail systems, headsails and spinnakers, halyards, vangs and backstays, as well as control lines on boats of all sizes. Choose the size based on line diameter and working load according to the table below.
TECHNICAL SPECIFICATIONS
Material
- Sheave: self-lubricating acetal composite
- Ball bearings: self-lubricating acetal composite
- Side plates/frames: reinforced fiberglass nylon composite with UV stabilization
- Shackle: Forged stainless steel, grade A4/AISI316
Applications
- Mainsail systems, headsails and spinnakers
- Halyards, vangs and backstays
- Control lines for boats of all sizes
Dimensions and loads
| Sheave Ø (mm) | 22 | 29 | 40 |
| Max. line Ø (mm) | 6 | 8 | 10 |
| Weight (g) | 8 | 17 | 34 |
| Working load (kg) | 100 | 160 | 230 |
| Breaking load (kg) | 390 | 500 | 800 |
FREQUENTLY ASKED QUESTIONS (FAQ)
How do I choose the right size block?
Base your choice on the line diameter and the load the block will carry. The 22 mm sheave is suitable for lines up to 6 mm, the 29 mm up to 8 mm, and the 40 mm up to 10 mm. The working load must always be higher than the actual load.
What is the difference between working load and breaking load?
The working load is the load the block is designed to handle continuously. The breaking load is the load at which the block will break and should never be used as a design specification.
Do the ball bearings need lubrication?
No, the sheave and ball bearings are made of self-lubricating acetal composite. We recommend rinsing the block with fresh water after use in salt water.