Ronstan Block

Ronstan 55mm single Orbit RF55111



Ultra Lightweight
Low friction 2-stage Orbital ball bearing system
Highest working load in its class
Low profile and compact
High performance cleating
Easily fitted and securely retained Dyneema Link head
Ultra low profile becket

Sheave: Ø55 mm
Max. Rope: Ø10 mm

M.W.L: 500 kg
B. L: 1000 kg
Weight: 75 g


Mainsheet systems on dinghies, sportsboats and small keelboats to 9m (30ft).
Halyard, Vang and Backstay application on boats to 8m (26ft).
Control line applications on larger yachts.


Ball bearings - High compression strength carbon black Acetal
Stage 2 bearing - Carbon fibre reinforced, PTFE impregnated Nylon
Frame/Cheeks - Toughened, glass fibre reinforced Nylon
Rope Link: UV stabilised, multi-strand impregmented SK75 Dyneema®