RONSTAN 45mm Core Stand-up Block - Swivel, RF44140

Core Blocks™ is a true all-around solution. A tuned 2-stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks, and stainless fixings complete the durable package. For reliability and long service life, these blocks are the right choice for sheets, halyards, and control line applications for cruising and racing.

Universal Bearing: Dynamic and high static load performance. The Ronstan Universal Bearing incorporates our proven 2-stage bearing system.

• Stage 1: Under moderate loads, Acetal ball bearings ensure minimum friction.
• Stage 2: Under heavy loads, where deformation of ball bearings alone would result in increased friction, a sliding Acetal bearing on a polished stainless steel race takes over, maintaining low friction performance.

Additionally, the ball bearings are configured to act as a thrust bearing between the sheave and cheeks, preventing the sheave from rubbing on the cheeks and causing friction when the line lead in and out of the block isn’t perfect. Particularly important for cheek blocks.

Alloy cheek plates: cheeks are manufactured from the highest quality alloy for maximum strength. Material optimization and the cut-away design minimize weight and allow easy fresh water rinsing of salt and debris from the bearings. The cheek design has been further styled with flaring at the block throat and reduced the gap between the cheek and sheave, minimizing rope wear.

Note: Special Order Only

• High dynamic and static load capacity.
• Efficient 2-stage bearing system.
• Ball bearings to counteract side thrust loads.
• Class-leading performance and sleek, contemporary styling.
• Durable aluminum alloy cheek plates.
• Central hub can be used as a becket take-off or tie-up point, Max 11.5mm line Features a strong cast padeye base with a swivel head post to allow full rotation and articulation