13mm - 48mm Steel Single/ Double Pulley Block Traction Wheel Swivel Lifting Rope

A single-sheave block simply redirects a rope from one direction to another — useful for changing the pull angle on a hoist or anchor point. A double-sheave block allows a two-part line (one end fixed, one end pulled), which creates a 2:1 mechanical advantage and halves the force needed to lift a load. Choose single for direction change only; choose double when you need to reduce pull effort.

The sheave diameter should be at least 6–8× the rope diameter for fiber rope, and at least 12× for wire rope, to avoid excessive bending stress. As a practical guide: a 13 mm sheave suits ropes up to approximately 4–5 mm; a 20 mm sheave suits ropes up to approximately 6 mm; a 25 mm sheave suits ropes up to approximately 8 mm; a 32 mm sheave suits ropes up to approximately 10 mm; a 36 mm sheave suits ropes up to approximately 12 mm; and a 48 mm sheave suits ropes up to approximately 16 mm. Always verify against the rope manufacturer's recommendation.

The zinc-plated or galvanized steel finish provides a meaningful level of corrosion resistance for damp workshop environments, light outdoor rigging, and occasional marine use. For continuous saltwater exposure, inspect the block regularly for surface rust and apply a corrosion-inhibiting lubricant to the sheave axle. For heavy-duty marine applications, consider stainless-steel blocks.

The working load limit varies by sheave size and block type (single vs. double). Please refer to the variant listing details or contact us to confirm the WLL for your specific size before use in any load-bearing application. Never exceed the stated WLL, and always apply an appropriate safety factor for overhead lifting.

Yes, these steel sheave blocks are compatible with wire rope, provided the sheave diameter is at least 12× the wire rope diameter to prevent kinking and fatigue. For example, a 48 mm sheave is suitable for wire rope up to approximately 4 mm diameter. Using an undersized sheave with wire rope will accelerate wire fatigue and reduce the effective WLL.

Apply a light machine oil or grease to the sheave axle/pin periodically, especially after exposure to water or heavy use. Inspect the swivel hook latch (if present) for free movement and check the hook throat for deformation before each use. Clean off dirt and grit from the sheave groove to prevent rope abrasion. Store in a dry location when not in use to extend service life.

Single-piece packs are ideal for replacing a single block in an existing rigging setup or for a one-off DIY project. Multi-packs (2, 5, 10, or 20 pieces) offer a lower per-unit cost and are suited for contractors, riggers, or makers building complete block-and-tackle systems that require multiple pulleys at different anchor points.