Harken 57mm Carbo Single Ratchet Block w/Swivel

The Harken 57mm Carbo Single Ratchet Block with Swivel is a precision-engineered load-control device designed for operators who need reliable holding power without sacrificing controlled line management. Whether you're rigging a recovery winch system, securing heavy loads, or managing dynamic rope tension in demanding applications, this single ratchet block delivers the balance between mechanical advantage and operator safety. The swivel design accommodates directional changes, making it ideal for complex rigging setups where loads shift or multiple anchor points require flexibility.

Built from Harken's Carbo composite material, the 57mm block resists corrosion and UV degradation while maintaining a lightweight profile at just 0.2 lbs. The ratcheting mechanism operates via an on/off switch accessible from both sides, allowing one-handed engagement and disengagement under load—critical for safety when hands are occupied or visibility is limited. The medium-grip standard configuration provides intuitive control and reduces operator fatigue during extended use, while the ratchet design allows you to hand-hold loaded lines securely and ease them under control without mechanical slippage or lock-up.

This block excels in recovery rigging, tactical applications, and any scenario requiring compact, corrosion-resistant load management. The compact 3 x 1 x 6-inch footprint integrates seamlessly into tight rigging systems where space is limited. The swivel accommodates both vertical and angular loads, making it suitable for recovery vehicles, portable winch systems, and emergency response equipment. Operators benefit from the bilateral switch design when wearing gloves or operating in low-visibility conditions, ensuring reliable engagement regardless of hand position or environmental factors.