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Ronstan Series 75 Core BlocksRonstan
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RONRF74100 - Ronstan Series 75 Core Block, Single
Code: RONRF74100
Original Price: $125.95
Price: $107.06
RONRF74100AW - Ronstan Series 75 Core Block, Single, Alum. Rope/Wire Sheave
Code: RONRF74100AW
Original Price: $169.95
Price: $144.46
RONRF74108 - Ronstan Series 75 Core Block, Halyard
Code: RONRF74108
Original Price: $115.45
Price: $98.13
RONRF74108A - Ronstan Series 75 Core Block, Mast Base, 8mm Clevis Pin
Code: RONRF74108A
Original Price: $84.45
Price: $71.78
RONRF74110 - Ronstan Series 75 Core Block, Single, Becket
Code: RONRF74110
Original Price: $149.95
Price: $127.46
RONRF74140 - Ronstan Series 75 Core Block, Stand-Up
Code: RONRF74140
Original Price: $225.95
Price: $192.06
RONRF74151 - Ronstan Series 75 Core Block, Foot
Code: RONRF74151
Original Price: $136.45
Price: $115.98
RONRF74202 - Ronstan Series 75 Core Block, Double, Non-Swivel Head
Code: RONRF74202
Original Price: $226.95
Price: $192.91
RONRF74251 - Ronstan Series 75 Core Block, Double Foot
Code: RONRF74251
Original Price: $226.95
Price: $192.91

RONSTAN Blocks - Core Blocks Size 75 - Overview


Ronstan Core Blocks™ Series 75 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.


  • Ronstan Series 75 Core Blocks


    We at Layline strive to be your source for Ronstan Series 75 Core Blocks and all sailboat hardware, rigging, and sailing gear. With our focus on one design and handicap racing we can offer advice and reviews of what you need to compete. If you need any assistance selecting the appropriate Ronstan Series 75 Core Blocks please contact us. Our crew is ready to help!
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