Product Description

Ronstan Series 75 Core Block stand-up Kit
Features

Class leading performance and sleek, contemporary styling

Excellent dynamic and high static load performance

Less than half the friction of the nearest competitor

Durable aluminum alloy cheek plates

Central hub hole can be used as a becket take-off or tie-up point

Accepts up to 14mm (9/16") rope

Sheave Ø - -

Max. Rope Ø - 9/16 in.

Max. Cable Ø - in

Pin Ø - in.

M.W.L. - 3300 lb.

B. L. - 6600 lb.

Weight - 15.3 oz.
Product Information
Core Blocks™ are a true all round 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 a 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
Block cheeks are manufactured from the highest quality alloy for maximum strength. Material optimisation and the cut-away design minimises weight and allows easy fresh water rinsing of salt and debris from the bearings. Cheek design has been further styled with flaring at the block throat and reduced gap between the cheek and sheave, minimising rope wear.
Applications

Ideal for use on mainsheet, spinnaker sheet, vang, halyard and backstay applications on boats up to 14m (46ft)

General applications on larger yachts

Alloy sheave models are available for use with wire

To suit RF130003, RC13012, RC13023 Series 30 Ball Bearing Traveler cars
Materials

Sheave: U.V. stabilised acetal or anodised aluminum (AW models)

Cheek plates: Aluminum alloy

Ball bearings: high compression strength carbon black acetal