Control Block Double

Precise Line Management

The Lewmar Control Block Double is engineered to deliver smooth, efficient handling of control lines where accuracy and responsiveness are essential. Designed for modern sailing systems, I provide dependable mechanical advantage and refined load management, supporting confident trimming and adjustment in both cruising and performance applications.

Compact Double-Sheave Design

Featuring a twin-sheave configuration, the Control Block Double enables increased purchase within a compact footprint. This efficient arrangement allows loads to be shared evenly across the system, reducing effort at the line while maintaining clean, organised deck layouts, ideal for control lines that require frequent, precise adjustment.

Marine-Grade Construction

Manufactured from durable, marine-grade materials, the Control Block Double is built to withstand the demands of the onboard environment. Precision-engineered sheaves and robust side plates ensure strength, dimensional stability, and resistance to wear, delivering consistent performance under repeated load and exposure to saltwater conditions.

Smooth, Reliable Performance

Designed to minimise friction and promote efficient rope flow, the block delivers predictable, controlled movement during trimming and easing. Its stable geometry helps maintain alignment and consistent load transfer, supporting accurate sail control and reducing fatigue during extended sailing or high-workload manoeuvres.

Installation & Application

Well-suited to a range of control-line systems, including sail controls, cascades, and fine-tuning applications, the Lewmar Control Block Double integrates easily into both new builds and professional refits. Its balanced deign and proven reliability make it a versatile professional-grade solution backed by Lewmar’s long-standing deck-hardware expertise.