Harken 57mm Ratchamatic® HTE Block — Swivel, 1.5x Grip

Harken 57mm Ratchamatic® HTE Block — Swivel, 1.5x Grip

The Carbo Ratchamatic® is a load-sensing ratchet block that rolls freely in both directions under low loads and automatically engages the ratchet as loads increase. Shifting between ratchet and light-air modes is seamless, giving sailors precise control across a wide range of conditions. Under low loads, the block spins freely in both directions for minimal friction and smooth trimming; as load increases beyond the higher engagement threshold, the ratchet automatically activates to hold the line securely.

The HTE (high-threshold engage) version features a stiffer spring that delays the point where the ratchet engages, allowing the block to run free more of the time. The ratchet function engages at higher loads to allow the kite sheet to run free for crisper gybes, making this block especially well-suited to spinnaker and mainsheet systems where clean, fast line release is essential. The 1.5x grip is tuned for breeze-on and puff conditions, providing 15:1 holding power for improved line handling and confident trimming.

Power3 ratchet blocks provide sailors racing small one-designs with multiple holding-power options to handle a variety of wind and sea conditions, allowing fine-tuning of set-ups in tandem with the purchase to achieve the ideal level of power, responsiveness, and grip. The swivel head ensures optimal alignment under changing loads, while the lightweight Carbo construction delivers strength and durability without adding unnecessary weight. This block is suitable for dinghies, sportboats, and small keelboats where reliable high-performance sailing hardware is required.

Key Features

• HTE (High Threshold Engage) system delays ratchet engagement for freer running
• Ratchamatic® load-sensing technology automatically engages under higher loads
• 1.5x grip for enhanced control in breeze-on and gusty conditions
• 15:1 holding power for improved line handling
• Rolls freely under low loads for smooth trimming and fast line release
• Ideal for spinnaker sheets and systems requiring clean gybes
• Swivel head for optimal alignment under changing loads
• Lightweight Carbo construction for strength and durability
• Seamless shifting between ratchet and light-air modes
• Suitable for dinghies, sportboats, and small keelboats