Single CORE pulley Mast base, clevis pin head

New product

62,69 €

62,69 € tax excl.


- Class leading performance and sleek, contemporary styling

- Excellent dynamic and high static load performance

- Less than half the friction of the nearest competitor

- Suits attachment to 14mm (9/16”) wide mast collar post

- Removable 8mm (5/16”) clevis pin at head

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

- * Full block rated load can only be achieved with uniformly distributed load across full length of clevis pin. ie. 14mm (9/16") diameter mast collar post or 14mm (9/16") wide mast collar plate/tang



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 - RF64108A

Serie 75 - RF74108A

Sheave Ø

60 mm

75 mm

Max. Rope Ø

12 mm14 mm

Max. Cable Ø



Pin Ø

8 mm

8 mm


1000 kg

1500 kg

B. L.

2000 kg

3000 kg


182 g

230 g



Sheave Ø60 mm / 75 mm
Rope ØMax 12 mm / 14 mm
Cable Ø-
WLL1000 kg / 1500 kg
Breaking load2000 kg / 3000 kg
Weight182 g / 230 g

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Single CORE pulley Mast base, clevis pin head

Single CORE pulley Mast base, clevis pin head

High quality and high efficience pulley

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