Harken 2136 57mm Carbo Ratchet Block with Swivel and Becket

The Harken 2136 57mm Carbo Ratchet Block with Becket is a high-performance sailing block designed to allow sailors to hand-hold loaded lines while maintaining an ideal balance between holding power and controlled easing. Featuring a swivel base and integrated becket, this block is well-suited for mainsheet systems, jib sheets, spinnaker sheets, traveler controls, and foreguys on dinghies and keelboats alike.

Key Features:

• On/Off Switchable Ratchet: Provides precise control with accessible, easy-to-operate switches on both sides of the block — switch the ratchet on when you need holding power, off when you want a free-running line
• Up to 10:1 Additional Holding Power: The 57mm ratchet sheave with eight facets grips the line securely under load, dramatically reducing hand fatigue
• Glass-Fiber Reinforced Nylon Sideplates: Densely packed long-glass fibers replace traditional stainless steel reinforcing straps, delivering a compact block with an outstanding strength-to-weight ratio
• Hardkote Anodized Machined Aluminum Sheave: Provides superior strength and long-term corrosion resistance in harsh marine environments
• UV-Stabilized Components: Ball bearings, sheave, and sideplates are UV-stabilized with carbon black for maximum protection against sun degradation
• Free-Rolling Ball Bearings: Ensure smooth, efficient line movement when the ratchet is disengaged
• Swivel Base with Becket: Allows multi-directional lead angles and provides an attachment point for additional purchase systems

Specifications:

• Sheave Diameter: 2-1/4 in (57 mm)
• Block Length: 4-15/16 in (125 mm)
• Weight with Shackle: 3.3 oz (94 g)
• Maximum Line Diameter: 3/8 in (10 mm)
• Shackle Pin Diameter: 3/16 in (5 mm)
• Maximum Working Load: 500 lb (227 kg)
• Breaking Load: 2,000 lb (907 kg)

For the ultimate mainsheet system, pair this switchable ratchet block in the cockpit with a boom-mounted Harken Ratchamatic® directly above — delivering double holding power in heavy air and a free-running mainsheet in light conditions. Manufacturer Part Number: 2136.