Stainless Steel 15-75mm Single/Double Pulley Block for Wire Rope Lifting Rigging

A single-wheel (single sheave) block is used to change the direction of a wire rope with a 1:1 mechanical advantage. A double-wheel (double sheave) block allows you to run two parts of a line through the same block, which — when combined with a second block — creates a 2:1 or greater mechanical advantage system. Choose single-wheel for simple direction changes and double-wheel when you need to reduce the pulling force required to lift or tension a load.

The wheel (sheave) diameter should be matched to the diameter of your wire rope. As a general guideline, the sheave diameter should be at least 16–20× the wire rope diameter to minimize rope fatigue. For example, a 4 mm wire rope typically pairs well with a sheave of 64 mm or larger. Refer to the specific variant listing or contact us to confirm the groove dimensions for each size before ordering.

Yes. The stainless steel construction provides strong resistance to rust and corrosion, making these blocks well-suited for marine rigging, outdoor cable systems, and environments with regular moisture exposure. For saltwater applications, rinse the block with fresh water periodically and inspect the swivel hook for any signs of wear.

These pulley blocks are designed and grooved specifically for wire rope (steel cable). Using fiber rope may result in accelerated rope wear due to groove geometry mismatch, and chain is not compatible with sheave-style blocks. For fiber rope applications, look for blocks with a wider, rounded groove profile designed for synthetic or natural fiber lines.

The working load limit varies by size and configuration. Larger wheel diameters and double-wheel configurations generally support higher loads. Please refer to the specific variant details or contact us to confirm the WLL for the size you need before using in any load-bearing application. Never exceed the rated WLL, and always apply an appropriate safety factor for your application.

No, wire rope is not included. These listings are for the pulley blocks only. You will need to source wire rope separately, sized to match the groove dimensions of your chosen block. If you need help selecting compatible wire rope or rigging accessories, feel free to contact us.

A basic 2:1 block-and-tackle system requires a minimum of two pulley blocks — one fixed (anchor) block and one moving (load) block. For a 3:1 system, you typically need two blocks with one being a double-wheel. Multi-pack options (2, 5, or 10 pieces) are available to help you build out a complete rigging system at a better per-unit value.