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Description
Ronstan Series 75 Core Block stand-up KitProduct 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 Max. Rope 9 16 in. Max. Cable in Pin in. M. W. L. 3300 lb. B. L. 6600 lb. Weight
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
Features
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
Materials
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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4.0 ★★★★★
Based on 10 reviews
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Product Reviews
★★★★★ 5
beautiful sapphic second chance
Format: Kindle
I could not put this book down, I devoured it in one day! A heartfelt sapphic romance that pulled you in from the start. Gemma and Caitlin’s dual POVs and dual timelines was done effortlessly. Seeing the struggles of a high school romance was so relatable. Then flash forward to the present when they were forced into each other’s lives after nine years because they were cast in the same movie! The cross between past, present, and the movie being filmed was full of angst, longing, regret, and hit me on every emotional level.
I could not recommend this book more!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 22, 2026
★★★★★ 3
Missed the Mark *Spoilers*
Format: Kindle
I was surprised by the author’s bio because at times it felt like this book was written by an adolescent imagining what filming a movie would be like. I really enjoyed certain parts of the book, especially the flashbacks to HS, the flirtatious note-writing and the botched Spanish terms of endearment. But the main feeling I had reading it was whiplash, in terms of all the back-and-forth between the MCs. Even at almost 30 years old, they both felt emotionally immature.
**Spoilers Ahead**
It was odd to me that when they finally confronted their past, it was in terms of the summer after their sophomore year of HS, rather than the big breakup when they were in college. Skipping ahead, the Paris ending felt very abrupt and out of character.
I also felt that certain side characters (Troy, Darbie, Emily, etc.) were very two-dimensional and discarded easily where it would’ve been interesting to see their reactions to the MCs’ relationship.
I can see where the author laid the groundwork for a good series, it definitely has potential. This book just missed the mark for me.
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Reviewed in the United States on February 17, 2026
★★★★★ 4
Fantastic Second Chance Romance
Format: Kindle
The only reason this book wasn’t a 5* was because Amazon doesn’t allow 4.5* and I felt like parts of the rekindling of their romance at the very end were slightly rushed. Aside from that, this book was INCREDIBLE. I fell in love with them as a couple from the beginning. Gemma’s back and forth emotional parkour was a little rough at spots with how quickly she changed from wanting nothing to do with Caitlin to wanting to take her home. BUT I loved the epilogue and the full circle moments of them together and their future. Can’t wait to read another book by this author!
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Reviewed in the United States on February 7, 2026
★★★★★ 5
Must buy
Format: Paperback
Support any lgbtq writer
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 26, 2026
★★★★★ 5
these are her viewpoint on a large mix of poems ... The Final Work
Format: Hardcover
helen vendler has done a magisteral job of presenting her poem selections
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 29, 2026