Harken Radial 20 Self-Tailing Winch, Chrome, One Speed
- Brand:
- Harken
- Part no:
- 20STCCC
Image: mauripro.com
Where to buy
Specifications
- Size
- 20
- Power ratio
- 19.2
- Speeds
- 1
- Self-tailing
- Yes
- Max line diameter
- 12 mm
- Drive
- Manual
- Base diameter
- 137 mm
- Gear ratio
- 2.76
- Weight
- 3.9 kg
The Harken Radial size 20 is a chrome winch with one speed and a self-tailing mechanism, so one crew member can trim or raise sails alone. The drum grips with diagonal ribs rather than an abrasive texture, aimed at maximum gripping power. Its power ratio is 19.2 and its gear ratio is 2.76. It accepts line up to 12 mm across and weighs 3.9 kg.
Our take
With one speed and a 19.2 power ratio, this winch has a single fixed mechanical advantage and no low gear to drop into. Its 12 mm maximum line size also caps the rope it can take, so check your sheet diameter against that.
From our buying guide
A winch's size number sits close to its top power ratio, though not exactly, and first-gear ratios vary more between brands. Each maker publishes its own sizing chart, so use the chart from the maker you're buying.
Check before you buy:
- It fits your existing holes, since same-size winches from different makers need not share a bolt circle.
- The self-tailing jaws take your rope, since they have a range.
- You have the right bolts. Harken does not supply them, and the makers disagree about countersunk heads.
Photo: Egor Myznik on Unsplash

