Single CORE pulley with aluminium sheave

New product

127,75 €

127,75 € tax excl.


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



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.


 Serie 60 - RF64100AW

Serie 75 - RF74100AW

Sheave Ø

60 mm

75 mm

Max. Rope Ø

12 mm14 mm

Max. Cable Ø

5 mm

8 mm

Pin Ø

6 mm

8 mm


1000 kg

1500 kg

B. L.

2000 kg

3000 kg


292 g

432 g


Sheave Ø1 3/4 in.
Rope Ømax 1/2 in.
Wire Øpin : 3/16 in.
WLL1540 lb.
Breaking load3090 lb.
Weight3.6 oz.

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Single CORE pulley with aluminium sheave

Single CORE pulley with aluminium sheave

High quality and high efficience pulley

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