Runner Block

The Lewmar Runner Block is engineered to manage the extreme and highly dynamic loads generated in modern running backstay and rig-control systems. Designed for performance cruising and racing yachts alike, it provides dependable, precise load handling where rig integrity and responsive control are critical to sailing performance and safety.

Optimised Runner Geometry

Specifically developed for runner and backstay applications, the block’s geometry ensures clean, predictable alignment under load. This optimised design supports efficient force transmission through the rig, helping maintain consistent mast support while allowing accurate adjustment during sail changes, manoeuvres, and varying wind conditions.

Heavy-Duty Marine Construction

Manufactured from high-strength, marine-grade materials and engineered to withstand sustained tension and shock loading, the Lewmar Runner Block is built for longevity in demanding offshore environments. Robust side plates, a high-load sheave assembly, and precision tolerances deliver exceptional structural integrity and resistance to wear under repeated high-cycle use.

Smooth, Controlled Performance

Designed to minimise friction even under extreme loads, the block delivers smooth rope movement and predictable response during loading and easing. This controlled performance reduces peak stress on running rigging and hardware, helping protect rope, fittings, and the rig as a whole while improving trimming accuracy and crew confidence.

Installation & Application

Well-suited to running backstays, checkstays, and other high-load rig-control systems, the Lewmar Runner Block integrates seamlessly into modern performance deck and rig layouts. Whether specified for new builds or professional refits, it represents a reliable, professional-grade solution backed by Lewmar’s long-standing expertise in load-critical sailing hardware.