This Series 55 Ratchet Orbit quad block has single intermediate cheeks and an ultra- light and efficient head arrangement to provide you with a 30% weight savings advantage over the nearest competitor. It offers you the highest working load in its class and ultra, low-profile integrated beckets.
This block utilizes Ronstan's orbital ball-bearing arrangement to create the largest possible race diameter and maximize load performance. It also takes advantage of Ronstan's two-stage bearing system to provide minimum friction across the full working load range.
Use it for mainsheet and spinnaker systems on dinghies, sportboats, small keelboats, and multihulls.
When paired with RF56330B and RF35101 lashed to the becket, this system produces a powerful 8:1 mainsheet system for catamarans up to 18' (5.5m). This can be increased to 9:1 by replacing the RF35101 with a RF35202.
|Breaking Load (lbs)||3300|
|Breaking Load (kg)||1500|
|Max Line Size (in)||3/8|
|Max Line Size (mm)||10|
|Note||SWL = Total block load. Load on becket not to exceed 33% of block load. MWL - 250g (550lbs) & Breaking Load - 500kg (1,100lbs).|
|Safe Working Load (lbs)||1650|
|Safe Working Load (kg)||750|
|Sheave Diameter (in)||2 5/32|
|Sheave Diameter (mm)||55|