Ronstan 40mm Orbit Ratchet Blocks

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 competition.

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 minimizes rope wear. These faces are offset from the radial line, to draw the rope down into the gripping area when under load.

Applications:

• Dinghy mainsheet systems.
• Mainsheet fine tune systems on sportboats & small keel boats.
• Mainsheet systems on sportboats using RF7 mainsheet swivel cleat unit.
• Spinnaker and jib sheets on dinghies – especially modern asymmetric classes.
• Control line applications on larger yachts.