Ronstan RF41171 Series 40 Single Upright Lead Block

The Ronstan Series 40 All Purpose Block with Single Upright Lead provides a low-profile solution for leading halyards and other rig sail controls back to cleats or jammers. Engineered for high-load applications, this lead block features a wear-resistant sheave made from lightweight, self-lubricating polymer suitable for use with both rope and wire.

Key Features:

• Low-profile design ideal for space-constrained installations
• UV-stabilized acetal sheave resists sun damage and wear
• Grade 316 stainless steel load housing for maximum corrosion resistance
• Self-lubricating polymer sheave reduces maintenance requirements
• Compatible with both rope and wire applications

Typical Applications:

• Halyard control at mast base
• Sail control line redirection
• High-load marine rigging systems

Ronstan's Series 40 blocks are built to withstand the demanding marine environment while providing smooth, reliable operation for critical sail control systems.