Harken 40mm Carbo Single Ratchet Block w/Swivel Becket & Cam Cleat

The Harken 40mm Carbo Single Ratchet Block with Swivel Becket and Cam Cleat is a precision line-handling component engineered for sailors and marine professionals who need controlled mechanical advantage under heavy load. This 40mm carbo ratchet block delivers the critical balance between holding power and smooth, hand-controlled easing that experienced sailors demand when working loaded lines on deck.

Built with a 40mm (1-9/16 inch) sheave diameter, the block accepts line up to 6mm (1/4 inch) diameter and is rated for a maximum working load of 150 pounds (68 kg). The ratchet mechanism allows one-handed operation—operators can hold a loaded line under tension while applying precise control, then ease it smoothly when needed without requiring a second crew member or complex rigging adjustments. The integrated swivel becket simplifies attachment to deck hardware and maintains alignment under load, while the cam cleat provides positive holding power to lock the line in place when released.

This block is designed for cruising sailors, racing crews, and marine operators who rely on dependable line control during sail trim, furling operations, and line management in variable sea conditions. The carbo ratchet design is particularly valuable for sailors working single-handed or in short-handed crews where efficiency and controlled line handling reduce fatigue and improve safety. The swivel becket configuration minimizes twisting and reduces wear on both the block and attached lines during extended use.

Harken ratchet blocks are standard equipment across the sailing industry, known for reliable performance in demanding marine environments. The 40mm single ratchet represents the practical middle ground for most cruising and mid-range racing applications—providing sufficient mechanical advantage for typical working loads while remaining compact enough for flexible deck placement and easy crew operation.