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Harken Ratchet Pulley

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Harken Ratchet Pulley

Availability: In stock

Quick Overview

Harken® Hexaratchets® grip loaded sheets with up to 8:1 holding power, yet allow line to be eased instantly with complete control.
Cost $333.85
Part No.StyleSheave SizeBL KGMax Rope Size Cost
HA 1549 Harken Ratchet Pulley 75mm 2000 14mm $333.85





Sheave Length Weight       
in mm in mm oz g          
3 76 6 1/8 156 14 397
Maximum Shackle Maximum Breaking Turns
Line Ø Pin Ø Working Load Load
in mm in mm lb kg lb kg  
9/16 14 5/16 8 1250 567 5000 2268 Clockwise




Hexaratchet features an eight-sided sheave for 8:1 holding power with a 180-degree wrap.

Material Constructs

 Ratchets feature Hardkote-anodized, Teflon®-impregnated, eight-sided sheaves machined from solid aluminum for strength and corrosion resistance.

Free-rolling Delrin® ball bearings, sheave, and sideplates are UV stabilized with carbon black for maximum protection.

High-strength stainless steel straps reinforce the pulleys.

 Ratchet SheaveSheave Design

Every brand of ratchet block has a signature shape for its sheave. When designing a sheave, there is a tradeoff between holding power, line chafe, and control. In heavy air a sheave with too much holding power will cause the sheet to suddenly slip and jerk through your hands. In light wind and low loads, the line gets stuck in the sheave. Also, sheaves with sharp edges are overly aggressive and destroy line quickly. We’ve tested many different designs, like sheaves with more facets or more holding power, but Harken has kept nearly the same sheave design for years. Sailors keep telling us it’s great—not only does the shape treat lines well, it offers the perfect mix of holding power and easing ability.

Ratchet Line Diameter

Line Diameter
The diameter and nature of your line has an impact on the effectiveness of your ratchet blocks. Be sure to use line sized to match the block. Line that is too large or two small won’t hold well due to a lack of contact with the facets. Hard, smooth lines don't offer the holding power of soft lines.

Ratchet Selection

Angle of DeflectionWhen selecting a ratchet block, it's important to match the block size to the load. Sizes are available to cover applications on a wide range of boats, but there's a tendency to undersize ratchets. Remember, a 180 degree turn doubles the loads. Use the Block Loading vs Angle of Deflection table when you refer to the Maximum Working Load (MWL) or Safe Working Load (SWL) specifications.

There's another practical reason for choosing a larger block—the holding power of a ratchet is partially dependent on the amount of contact between the sheave and the line. A larger diameter sheave presents more surface contact for the same amount of line wrap. Even when the load allows a smaller ratchet, a larger one provides better holding power. You'll often see pretty big ratchets on the jib sheets of dinghies to improve holding power without the use of a cleat. For the same reason, a ratchet is more effective when the line turns 180 degrees around the sheave. As a result, they are better used as transom blocks for spinnaker sheets than as deflector blocks forward where the line wrap might only be 90 degrees.