20ST Orbit Winch™, 1-Speed

Lightweight aluminium winch with self-tailer and Power Ribs™ ensures a controlled grip on the line at all times.


Sprung self-tailing jaws to accept 6 - 10mm line.

Proven Andersen winch gearing configuration.

Power Rib™ ensures a controlled grip on the line at all times, whether trimming or easing. Minimal rope wear compared to more abrasive drum surface finishes.

No tools required for configuration and servicing.

Machined aluminium drum – stronger and lighter than traditional cast aluminium drums.

Aluminium centre stem, lighter weight compared to bronze stems.

Low line entry due to gearing configuration geometry.

DAME Category Award Winner



Full disassembly and reassembly can conveniently be performed without the need for any tools. To remove the drum, pull back the spring-loaded release latch and a slight anti-clockwise rotation will allow the self-tailing arm to be lifted from the winch. From there, the drum can be removed from the winch centre stem. When completing reassembly in reverse order, an audible click confirms positive engagement between the self-tailing arm and bayonet notches on the centre stem. These notches allow the self-tailing arm to
be locked in one of 8 positions at rotational increments of 45 degrees.


Inspired by the distinctive drum profile of Andersen winches, Power Ribs™ have been incorporated into the fully machined drums of Ronstan’s Orbit Winches™ to deliver the same impressive line handling with maximum grip and minimal rope wear. The exceptional grip provided by the Power Ribs™ offers a multitude of benefits: requiring fewer wraps around the drum, reducing the load held in the self tailer, and encouraging the line to slide easily upward on the drum to avoid riding turns. The nonabrasive drum surface extends the service life of running rigging and allows for smooth and controlled easing, even under high loads.

Technical Information

Specification Details

Specification Details
Base "B" Ø (in)4 3/4"
Drum "D" Ø (in)3"
Height "H" (in)4 7/8"
Line Entry "L" (in)1 5/8"


  • Genoa Sheets
  • Spinnaker Sheets
  • Main Sheets
  • Genoa Halyards
  • Spinnaker Halyards
  • Main Halyards
  • Reef Lines



  • Hard anodised aluminium drum and centre stem, aluminium self-tailing arm.
  • Grade 316 stainless steel shaft and pawls.
  • Grade 2205 stainless steel axle pins.
  • Aluminium bronze gears.
  • Glass-filled nylon self tailer.
  • Self-lubricating acetal bearings.


Resource Files

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