Harken 57 mm Ratchamatic Block — Swivel 2625

Harken 57mm Ratchamatic® Block – Swivel 2625

The Harken 57mm Ratchamatic® Block 2625 is an innovative load-sensing ratchet block that automatically switches between free-running and ratchet modes as loads change. Featuring Harken's patented Ratchamatic® technology and 10:1 holding power, it delivers effortless trimming, reduced sheet loads, and smooth performance across a wide range of sailing conditions.

The Harken 57mm Ratchamatic® Block 2625 combines the convenience of a free-running block with the holding power of a ratchet block in one intelligent, automatic system. Designed to improve sail handling and reduce crew fatigue, the patented Ratchamatic® mechanism automatically engages the ratchet when sheet loads increase and disengages when loads decrease.

Under light loads, the block rolls freely in both directions with minimal friction, allowing sheets to run smoothly during tacks, gybes, and sail adjustments. As loads increase, the internal mechanism automatically activates the ratchet function, providing additional holding power and reducing the effort required to maintain sheet tension.

The transition between free-running and ratchet modes is seamless and requires no manual adjustment, making the block particularly effective in changing wind conditions where loads fluctuate frequently. This intelligent load-sensing design helps sailors maintain precise sail control while reducing arm fatigue during extended sailing sessions.

Built with Harken's lightweight and durable Carbo construction, the 2625 offers excellent strength-to-weight performance and reliable operation in demanding marine environments. The integrated swivel allows the block to align naturally with the load, improving line handling and reducing twisting.

With 10:1 holding power, the Harken 57mm Ratchamatic® Block is ideal for mainsheets, spinnaker sheets, gennaker sheets, and other trimming systems where efficient load management and smooth operation are essential.

Key Features

• Patented Harken Ratchamatic® technology
• Automatically engages ratchet under load
• Free-running operation in light-air conditions
• Seamless transition between modes
• 10:1 holding power
• Reduces trimming effort and crew fatigue
• Lightweight Carbo composite construction
• Swivel head for improved alignment
• Smooth, low-friction performance
• No manual switching required
• Ideal for dynamic sail trimming applications

Ideal For

• Dinghy sailing
• Skiff racing
• Sportsboat sailing
• Keelboat racing
• Mainsheet systems
• Spinnaker sheets
• Gennaker sheets
• High-performance sailing
• One-design racing

Technical Specifications

• Model: 2625
• Block Type: Ratchamatic® Ratchet Block with Swivel
• Sheave Diameter: 57mm
• Length: 103mm
• Weight: 104g
• Shackle Pin Diameter: 5mm
• Maximum Line Diameter: 10mm
• Maximum Working Load: 227kg
• Breaking Load: 907kg
• Holding Power: 10:1
• Construction: Harken Carbo Composite

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