Quite simply, Ronstan Ratchet Orbit blocks™ have the highest holding power available. The sophisticated NC-machined sheave features Generation 2 of our patented sheave cross-hole geometry. The Series 40 delivers up to 14:1 holding power, almost double that of our nearest competititor.
The unique sheave design has 8 gripping faces which directly resist loaded line movement. Traditional designs have an angled resistance to line movement. Our Generation 2 design has straight resistance faces which both distribute the load and minimise rope wear. These faces are offset from the radial line, to draw the rope down into the gripping area when under load.
Smooth easing of sheets
With auto models the sheet runs out smoothly and freely as soon as the ratchet mechanism disengages. When engaged, and with manual models, the sheave cross-hole geometry eliminates the 'shuddering' ease-out that you can expect from traditional v-groove ratchet blocks.
Technical Information
Applications
Dinghy mainsheet systems.
Mainsheet fine tune systems on sportsboats & small keel boats.
Mainsheet systems on sportsboats using RF7 mainsheet swivel cleat unit.
Spinnaker and job sheets on dinghies - especially modern asymmetric classes.
Control line applications on larger yachts.
Materials
Sheave: Anodised Aluminium
Ball Bearings: High compression strength carbon black Acetal
We would love to keep in touch with you! Sign up to our quarterly newsletter and receive news, tips, and updates right in your inbox.
Newsletter
This website uses cookies to improve your experience. By clicking “Accept”, you consent to the use of ALL the cookies. However you may visit Cookie Settings to provide a controlled consent.
Ball Bearing 
