Lewmar 40mm Control Block - Single, Swivel

Lewmar 40mm Control Block - Single, Swivel

The Lewmar 40mm Control Block with swivel is engineered for sailors who demand lightweight performance without sacrificing load-bearing capability. MRT (Metal Replacement Technology) combined with a stainless steel central race and ball bearings provides a meaningful weight advantage over traditional metal-bodied blocks, while Long Fibre Technology in the composite cheeks offers exceptional strength and durability for demanding on-water use.

The open block design allows saltwater, sand, and debris to be flushed out effortlessly, keeping maintenance simple and extending service life. High-strength, glass-filled sheaves ensure the block can manage heavy loads, while the stainless steel ball grooves prevent deformation and maintain peak performance over time. Reduced friction from the ball-bearing design means smoother sail handling and less rope wear, translating to more precise control and a longer line life.

With a 40mm sheave diameter, the block accommodates line up to 3/8 inch (10mm) in diameter and carries a safe working load of 528 lbs (240 kg) at a featherweight 1.8 oz (52g). The swivel mounting allows the block to rotate freely and orient to load direction, making it highly versatile across a range of applications.

Key Features

• MRT (Metal Replacement Technology) for reduced weight
• Stainless steel central race and ball bearings for smooth, high-efficiency operation
• Long Fibre Technology composite cheeks for exceptional strength and durability
• Open design for easy flushing of sand and salt — low maintenance
• High-strength, glass-filled sheave handles heavy loads
• Lightweight and impact resistant construction
• Reduced friction for faster sail handling and less rope wear
• Swivel mount for versatile load-direction orientation
• Post diameter: 5/16 in. (8mm); max pin diameter: 5/32 in. (4mm)
• Accepts line up to 3/8 in. (10mm)
• Safe working load: 528 lbs (240 kg); breaking strength: 800 kg
• Ideal for medium and dynamic loads including control lines, mainsheets, spinnaker sheets, barber haulers, and genoa sheets