SKU: 88697114385

Ronstan Series 75 Core Block™ - Single

Sale price$138.47 Regular price$153.85
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Ships within 48 hours · Estimated delivery Aug 15 - Aug 20

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Description

Ronstan Series 75 Core Block™ - SingleSeries 75 Core Block Single 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

Series 75 Core Block™ - Single

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.

Universal head
The head assembly incorporates a brass bearing washer to provide smooth 360™ rotation of the post and shackle. A set screw arrangement allows the head to be locked at 0™ or 90™.

Shackles are high quality forged grade 316 stainless steel.

Features:
  • Class leading performance and sleek, contemporary styling
  • Excellent dynamic and high static load performance
  • Less than half the friction of the nearest competitor
  • Universal head with full 3-axis articulation
  • Head posts can be locked at 0 or 90 degrees, by using a 2.5mm Hex/Allen Key
  • Central hub hole can be used as a becket take-off or tie-up point


Applications:
  • Ideal for mainsheet, halyard and spinnaker sheet applications on boats to 14M (46')
  • Various control line applications on larger yachts


Materials:
  • Sheave: U.V. stabilized Acetal
  • Cheek body: Aluminium Alloy
  • Ball Bearings: High compression strength carbon black Acetal
  • Shackle, head post & hub: Grade 316 stainless steel


Specifications:
Sheave Ø: 75mm(3")
Max. Rope Ø: 14mm(9/16")
Pin Ø: 8mm(5/16")
M.W.L.: 1,500kg(3,300lbs)
B. L.: 3,000kg(6,600lbs)
Weight: 354g(12.5oz)


Manufacturer : Ronstan
Manufacturer Part No : RF74100
UPC : 9316800413225
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. 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
SKU: 88697114385

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anonymous
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★★★★★ 5
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Size: X-Small, Color: Navy Blue, Size: X-Small, Color: Navy Blue
Beautiful suit and it fit great based on the chart measurements! Will be buying the same suit next size up when the time comes.
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Reviewed in the United States on May 4, 2026
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Dre
Lexington, US
★★★★★ 5
Great quality, better than a rental.
Size: 4X-Large, Color: Navy Blue, Size: 4X-Large, Color: Navy Blue
This suit was a pleasant surprise in quality! Just note, sizing isn’t perfect since it’s a set, so the pants were really long and the waist slightly bigger than my husband’s actual size, as we had to fit for his chest and shoulders. However, we were able to hem the pants quite easily and he just wore a belt which worked perfectly. For the price and quality you receive, well worth it. We ended up using a different tie than given so it would match my dress. Worth every cent even if worn once since rentals are way more expense. This held up for a full 8hrs of schmoozing and dancing and is still in great shape.
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Reviewed in the United States on March 23, 2025
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Things that I love
Lexington, US
★★★★★ 5
Definitely worth it
Size: Small, Color: Navy Blue, Size: Small, Color: Navy Blue
If I could give 10 starts I would. Really good quality, fits super well and color matches perfectly how is advertised. Delivery quick.
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Reviewed in the United States on April 2, 2026
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Alwann Noel
Massapequa, US
★★★★★ 5
Sharp Fit & Great Quality
Size: Medium, Color: Red
Great suit — fits well and looks even better in person. The material feels high quality, the cut is clean, and it gives a sharp, professional look. Perfect for business settings, meetings, or any occasion where you want to stand out. Definitely a solid choice if you’re looking for style and confidence at a great value.
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Reviewed in the United States on April 1, 2026
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Birmingham, US
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