Footblocks and wire blocks

Turning Blocks and Cable Pulleys: The Complete Guide

Turning blocks and cable pulleys are crucial elements for any sailboat's running rigging system. Their primary function is to redirect lines and cables, minimizing friction and allowing for efficient power transfer. A well-chosen block not only simplifies maneuvers but also helps extend the lifespan of your lines and cables by reducing wear and tear.

Choosing the right block depends on several factors, including the anticipated workload, the diameter of the line or cable, the type of maneuver, and the environment in which it will be used. Our blocks are available in various sizes, materials (nylon, aluminum), and with different breaking loads to meet the needs of every type of boat and sailing condition. We also offer many sheaves for cables.

Nautica Basile offers turning blocks and cable pulleys from the best brands in the industry, including Osculati, Pfeiffer, Seasure, and Viadana. These brands are synonymous with quality, reliability, and durability. Whether you're looking for a block for your halyard, sheet, vang, or mainsail control system, you'll find the perfect model for your needs. We stock many wire rope pulleys.

How to Choose the Right Block?

• Breaking Load: Ensure the block has a breaking load suitable for the forces involved. It's always best to slightly oversize the block to ensure a safety margin.


• Sheave Material: Nylon is suitable for general use and moderate loads, while aluminum offers greater strength and durability for higher loads and intensive use.


• Line/Cable Diameter: Verify that the sheave groove is compatible with the diameter of the line or cable you intend to use. An incorrect diameter can cause premature wear and compromise safety.


• Type of Block: Choose from single, double, triple blocks, with becket, with soft attachment, low friction, depending on your specific needs. Consider the working angle and the need for orientation.


• Body Material: AISI 316 stainless steel offers maximum corrosion resistance in the marine environment.

Useful Tips from Nautica Basile

A block that shows signs of wear, squeaks, or has difficulty rotating should be replaced immediately. Block failure during sailing can cause damage to equipment and endanger the safety of the crew. Periodically check the condition of the blocks, lubricate moving parts with a marine-specific lubricant, and replace worn sheaves. Consider upgrading to cable pulleys for increased durability.

• Fast and secure shipping throughout Italy.


• Satisfaction or refund guarantee.


• Specialized technical support before and after sales.

Complete your running rigging system with our high-tenacity ropes, our shackles and snap hooks in AISI 316 stainless steel, and our rope clutches.

How can I tell if a block is undersized?

If the block visibly deforms under load, if the sheave has difficulty rotating, or if you notice signs of excessive wear, it is likely undersized and should be replaced with a more robust model.

What is the difference between a low-friction block and a standard block?

Low-friction blocks use ball or roller bearings to minimize friction between the sheave and the block body. This results in greater efficiency and less wear on lines and cables. They are particularly suitable for maneuvers that require precision and sensitivity.

Can I use a cable pulley with a textile rope if I change the sheave?

No, even if you change the sheave, the body of the cable pulley is designed to withstand the specific stresses of a wire cable. Using it with a textile rope, even with the correct sheave, could compromise the safety of the system.

How often should I replace the blocks on my boat?

The lifespan of blocks depends on several factors, including frequency of use, environmental conditions, and the quality of materials. In general, it is advisable to regularly inspect the blocks and replace them every 5-10 years, or sooner if you notice signs of wear or damage.

How can I tell if a block is undersized?

If the block visibly deforms under load, if the sheave has difficulty rotating, or if you notice signs of excessive wear, it is likely undersized and should be replaced with a more robust model.

What is the difference between a low-friction block and a standard block?

Low-friction blocks use ball or roller bearings to minimize friction between the sheave and the block body. This results in greater efficiency and less wear on lines and cables. They are particularly suitable for maneuvers that require precision and sensitivity.

Can I use a cable pulley with a textile rope if I change the sheave?

No, even if you change the sheave, the body of the cable pulley is designed to withstand the specific stresses of a wire cable. Using it with a textile rope, even with the correct sheave, could compromise the safety of the system.

How often should I replace the blocks on my boat?

The lifespan of blocks depends on several factors, including frequency of use, environmental conditions, and the quality of materials. In general, it is advisable to regularly inspect the blocks and replace them every 5-10 years, or sooner if you notice signs of wear or damage.