Ronstan's award-winning Series 45mm Core Blocks have a tuned two-stage bearing system that provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle dynamic or static loads.
Under moderate loads, the Acetal ball bearings ensure minimum friction. Under heavy loads, stage two kicks in and the sliding Acetal bearing on a polished stainless steel race takes over to maintain low-friction performance.
The Series 45 Core Blocks are ideal for mainsheet, halyard, and spinnaker sheet applications on boats up to 33' (10m) and general applications on larger yachts.
The central hub hole can be used as a becket take-off or tie-up point. Recommended accessories for this single block include standard Dee shackles with 3/16 in pin diameter slotted or coined pin heads. You may also want to purchase a RF6170 snap shackle head adapter, or a RF6171 trunnion snap shackle head adapter.
|Breaking Load (lbs)||3090|
|Breaking Load (kg)||1400|
|Clevis Pin (in)||3/16|
|Max Line Size (in)||1/2|
|Max Line Size (mm)||12|
|Safe Working Load (lbs)||1540|
|Safe Working Load (kg)||700|
|Shackle Pin (in)||3/16|
|Shackle Pin (mm)||5|
|Sheave Diameter (in)||1 3/4|
|Sheave Diameter (mm)||45|