Harken Carbo Ratchamatic Block with Swivel 2625 - 57mm

The Harken 57 mm Carbo Ratchamatic Block for 10 mm sailing rope with aluminium sheave and frame comes with swiveling shackle that can be locked in place stopping it from twisting if desired. The Carbo Ratchamatic is a load sensing block that feeds rope in both directions. It can trim and ease the sheets under pressure with complete control.

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.

Standard grip: medium/light air; 10:1 holding power.

Harken 57 mm Blocks feature Cam-Lock or U-Lock locking systems to lock the shackle in front or side positions, or swivel to keep line from twisting.

Harken Ratchamatic, Carbo Ratchet, and Hexaratchet blocks are lightweight, strong, and run exclusively on ball bearings for fast trimming under any load.

Harken ratchet blocks hold part of the sheet's load, let you trim and ease with complete control, and enable higher trimming speeds. Ratchets make it much easier to hand-hold higher loads by only allowing the sheave to turn in the trimming direction. When you are holding or releasing the load, the faceted sheave grips the line to reduce fatigue and give you more control. Also, ratchets make faster trimming possible because you don't have to hold the full force of the sheet while shifting your grip.

Options include ratchet blocks with beckets, adjustable cams, multiple sheaves, adjustable automatic load-sensing mechanisms, and footblock and fiddle configurations. Harken offers ratchet blocks in sizes between 40 and 75 mm (1 9/16" - 3").

Where should I use ratchet blocks?

Harken Ratchet blocks are great for any system that is normally adjusted by hand, including mainsheets, jib sheets, spinnakers, vangs, and backstays on everything from dinghies to large keelboats. In addition to increasing the loads you can manage without a winch, they reduce shock loading on your hands and your equipment for example, a ratchet block can stop an unanticipated gust from yanking the line through your hands or from putting too much load on your cam cleats. Some dinghies and sportboats even use two Ratchamatic blocks in series for turns less than 90 degrees per ratchet block.

What are Harken Hexaratchet and Carbo Ratchet blocks?

Hexaratchets and Carbo Ratchets have sheaves that turn only in the trimming direction when the ratchet is turned on. Carbo Ratchets are built with the same lightweight and strong materials as other Harken Carbo blocks, while Hexaratchets come in the stainless steel-reinforced Classic style. Hexaratchets and Carbo Ratchets increase holding power by as much as 15:1.

What is a Harken Carbo Ratchamatic?

The load-sensing Harken Ratchamatic Block has a ratchet that instantly engages when a predetermined load is reached. When unloaded, the ratchet pawl seamlessly disengages to allow the sheet to run out instantly during mark roundings and jibes. The Ratchamatic allows lightly-loaded sheets to run freely in both directions for fingertip control. The preset load threshold can be fine-tuned with an Allen wrench to suit different applications, sailing styles, and body types.

Specifiactions

• Sheave diameter: 2 1/4" (57 mm)
• Length: 4 1/16" (103 mm)
• Weight: 3.7 oz. (104 g)
• Shackle pin diameter: 3/16" (5 mm)
• Maximum line diameter: 3/8" (10 mm)
• Maximum working load: 500 lb (227 kg)
• Breaking load: 2000 lb (907 kg)
• Holding power: 10:1

Technical File

Instruction Manual