SKU: 82847859050

Ronstan Series 45 Stand-Up Core Block - Swiveling

Sale price$119.58 Regular price$132.87
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Ships within 48 hours · Estimated delivery Jul 22 - Jul 27

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Description

Ronstan Series 45 Stand-Up Core Block - SwivelingSeries 45 Stand Up Core Block Swiveling 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,

Series 45 Stand-Up Core Block - Swiveling

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 optimization and the cut-away design minimizes 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, minimizing rope wear.

Features:
  • High dynamic and static load capacity
  • Efficient 2-stage bearing system
  • Ball bearings to counteract side thrust loads
  • Class leading performance and sleek, contemporary styling
  • Durable aluminium alloy cheek plates
  • Central hub hole can be used as a becket take-off or tie-up point
  • Features a strong cast padeye base with a swivel head post to allow full rotation and articulation
Applications:
  • Ideal for mainsheet, halyard and spinnaker sheet applications on boats to 10M (33')
  • Various control line applications on larger yachts
  • Alloy sheave models are available for use with wire
Materials:
  • Sheave: U.V. stabilised Acetal
  • Cheek body: Aluminium Alloy
  • Ball Bearings: High compression strength carbon black Acetal
  • Shackle, head post & hub: Grade 316 stainless steel
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: 82847859050

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4.4 ★★★★★
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Jay Boz
Lexington, US
★★★★★ 4
Great product! Slightly longer than I’d like to remove the ferrules
Great product works as described, mounted without any problems, only issue I ran into was removing the pre inserted ferrules from the block to utilize a larger gauge wire. Outside of that it’s a great and definitely would purchase again
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Reviewed in the United States on December 1, 2025
T
Verified Purchase
Tyson
West Palm Beach, US
★★★★★ 5
Solid Power Block — Easy Install & Works Great
This fused power distribution block was exactly what I needed for my car audio setup. It’s sturdy, easy to install, and keeps my wiring clean and organized. The fuses fit tight, the cover snaps on well, and everything feels secure. Perfect for amps or accessory add-ons. Great quality for the price!
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Reviewed in the United States on December 9, 2025
M
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Marcus
Cuba, US
★★★★★ 5
Gets the job done
Perfect for running 2 amps
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Reviewed in the United States on February 27, 2026
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Verified Purchase
Plofty
Fort Morgan, US
★★★★★ 5
Clean product
Fast shipping and nice product
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Reviewed in the United States on March 9, 2026
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Verified Purchase
scott courtenay
Chelsea, US
★★★★★ 5
Great construction & layout
Love the dual design works for my project in the space I had. Thanks!
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Reviewed in the United States on December 26, 2025

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