A2Stainless Steel Single Double Pulley Rope Pully Lifting Wheel Swivel Block 304

Match the sheave groove diameter to your rope's outer diameter. As a general rule, the sheave groove should be slightly larger than the rope diameter to allow smooth travel without excessive play. For example, an M20 block is typically suited to ropes in the 4–6 mm range, while an M50 block accommodates heavier rope. Check the variant listing or contact us to confirm the groove size for your specific size selection.

Working load limits vary by size and configuration (single vs. double sheave). The double-sheave block used in a block-and-tackle arrangement effectively multiplies mechanical advantage, reducing the force needed to lift a given load. Specific WLL figures are listed in the variant details. If you need confirmation for a safety-critical application, please contact us before ordering.

304 stainless steel offers good corrosion resistance in most outdoor and freshwater environments. For prolonged saltwater immersion or highly aggressive marine environments, 316 stainless steel is generally recommended. These blocks are well-suited for occasional marine use, coastal rigging, and freshwater applications. Rinse with fresh water after saltwater exposure to extend service life.

A single-sheave pulley redirects a rope from one direction to another, useful for changing the angle of pull. A double-sheave pulley has two wheels side by side, allowing you to run two rope lines through one block — typically used in block-and-tackle systems to create mechanical advantage and reduce the effort needed to lift heavy loads.

Yes. These blocks are compatible with both wire rope and fiber rope. Ensure the wire rope diameter matches the sheave groove size for your selected variant. Using an oversized wire rope can cause binding and accelerated wear on both the rope and the sheave.

The swivel bail is designed to rotate freely to self-align with the direction of pull and prevent rope twist. It is not a locking swivel — it will continue to rotate under load. If your application requires a fixed (non-rotating) attachment point, a standard eye bolt or fixed-bail block would be more appropriate.

Order 1 piece for a single redirect point or replacement. Order 2 pieces if you're building a basic block-and-tackle system (one fixed block, one moving block). Order 5 pieces for multi-point rigging setups, workshop installations with several anchor points, or to keep spares on hand for ongoing projects. The 5-piece pack offers the best per-unit value.