Ronstan's award-winning Series 75mm 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 75 Core Blocks are ideal for mainsheet, halyard, and spinnaker sheet applications on up to 46' (14m) and general applications on larger yachts.
This Core Block has less than half the friction of its nearest competitor. This is a fully articulated stand-up model with a low-profile linkage that provides full rotation and articulation. A high-strength precision cast pad eye minimized the footprint and a dedicated rubber boot ensures the block is held upright when not rotated.
|Breaking Load (lbs)||6600|
|Breaking Load (kg)||1500|
|Max Line Size (in)||9/16|
|Max Line Size (mm)||14|
|Safe Working Load (lbs)||3300|
|Safe Working Load (kg)||1500|
|Sheave Diameter (in)||3|
|Sheave Diameter (mm)||75|