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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.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.7 ★★★★★
Based on 28 reviews
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Product Reviews
★★★★★ 5
It holds all my gear and looks fantastic!!
Color: Rustic Montana, Size: 11.5" x 8" x 2", Color: Rustic Montana, Size: 11.5" x 8" x 2"
I wanted something to hold EVERYTHING. In the pic - 2 wallets, tactical flashlight, 2 personal bluetooth speakers, 2 pairs of Beats, chap stick, pocketknife. Missing are my reading glasses but they typically will fit in there too even in their protective sleeve. This would make a great gift and the leather is excellent feel and look. This is the Extra Large size and i am happy i went with the bigger one as i almost didnt. Wife thought it was a great purchased but mad that she didnt get the chance to gift it to me for Father's Day or birthday!! LOL
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Reviewed in the United States on April 9, 2024
★★★★★ 5
Unique Jewelry Holder
Color: A White, Color: A White
Beautiful jewelry holder. Great for a gift but I brought this for myself. It arrives in 2 pieces that are easy to put together. It looks great on my dresser and helps to organize my jewelry.
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Reviewed in the United States on December 22, 2025
★★★★★ 5
Nice gift
Color: A White
It was a gift . She was pleased . Decorative.
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Reviewed in the United States on April 2, 2026
★★★★★ 4
Cute
Color: A White, Color: A White
It's super cute and goes well with the decor in my room. Comes with a leather bottom and easy to put together. Only problem is that's is a easy to fall apart as well. If one side is heavier then the other it will be lopsided. Holds necklaces okay... if you have heavy charms on them they will fall off.
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Reviewed in the United States on March 19, 2025
★★★★★ 3
Disappointing
Color: A White
The plastic was a little cheaper than I thought it would be, and the whole thing was a little smaller than I was picturing, you aren't able to rest necklaces on it because it's too short. Unfortunately I got it as a gift for someone else so I can't speak to its longevity but it was a bit disappointing.
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Reviewed in the United States on April 24, 2025