Ronstan 75mm Core Block, Halyard
Ronstan's award-winning 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. Their alloy cheek plates have a flaring block throat and reduced gap between the cheek and the sheave to minimize rope wear.
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 is suited for direct attachment to the mainsail headboard for 2:1 halyards. It has a removable 5/16 in (8mm) threaded stainless steel pin at the head. Its central hub hole can be used as a becket take-off or tie-up point.
|Breaking Load (lbs)||6600|
|Breaking Load (kg)||1500|
|Clevis Pin (in)||5/16|
|Max Line Size (in)||9/16|
|Max Line Size (mm)||14|
|Max Wire Size (in)||5/16|
|Max Wire Size (mm)||8|
|Safe Working Load (lbs)||3300|
|Safe Working Load (kg)||1500|
|Shackle Pin (in)||5/16|
|Shackle Pin (mm)||8|
|Sheave Diameter (in)||3|
|Sheave Diameter (mm)||75|