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Description
Ronstan 75mm Double, Non-Swivel Head Core BlockProduct Description Ronstan 75mm Double, Non Swivel Head Core Block 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 Removable threaded pin at shackle head Central hub hole can be used as a becket take off point. Measurements
Product Description
Ronstan 75mm Double, Non-Swivel Head Core Block
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
Removable threaded pin at shackle head
Central hub hole can be used as a becket take-off point.
Measurements
Sheave Ø - 3 in. (75 mm)
Max. Rope Ø - 9/16 in. (14 mm)
Max. Cable Ø - in (mm)
Pin Ø - in. (mm)
M.W.L. - 330 lb. (1500 kg)
B. L. - 6600 lb. (3000 kg)
Weight - 17.9 oz. (506 g)
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 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.
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.
Materials
Sheave: U.V. stabilized acetal or anodized aluminum (AW models).
Cheek plates: Aluminum alloy
Ball Bearings: High compression strength carbon black acetal.
Pin: 2205 stainless steel
Features
Measurements
Sheave Ø - 3 in. (75 mm)
Max. Rope Ø - 9/16 in. (14 mm)
Max. Cable Ø - in (mm)
Pin Ø - in. (mm)
M.W.L. - 330 lb. (1500 kg)
B. L. - 6600 lb. (3000 kg)
Weight - 17.9 oz. (506 g)
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 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.
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
4.2 ★★★★★
Based on 17 reviews
Sort
Product Reviews
★★★★★ 5
LOVE. Ordering more colors.
Size: Medium, Color: Porpoise, Size: Medium, Color: Porpoise
I absolutely LOVE this sweater.
This sweater is so flattering and comfortable. Great quality and the material is cozy and soft. I will be ordering this in more colors for sure! I just got it today but I know this will be my go to this season for lounging as well as being out and about. It could easily be dressed up or down and I love the Porpoise color I got (see photos). Originally I thought this came in a set but I still thinks its worth the price for just the sweater and I plan to order the shorts anyway. I got the medium and it fit true to size and so flattering. I am 5ft 2 and about 140lbs being heavier in my legs/hips. I generally wear a small/medium on top depending on the style and a large/XL on bottom. Definitely will be getting more colors!!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 1, 2023
★★★★★ 5
beautiful Perfect Sweater! Highly Recommend!
Size: 3X, Color: Zephyr Pink
Gorgeous color. Soft and snuggly. Cool enough in summer for office wear. My office sometimes gets cold even in the summer and this sweater is perfect. I wear it with brown slacks and it looks very professional but could be dressed down for casual affairs. The cut is generous and maybe even runs a little large however, I like the loose fit. I still can't get over the neutral pink color. It is just amazing and was a real steal as it was on sale when I ordered it!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 22, 2025
★★★★★ 4
Stylish and comfortable
Size: 3X, Color: Porpoise
I love the slit in the back, it elevates the sweater well. It’s comfortable and made out of a thick, quality material. The only downside is that the sleeves are quite long and don’t roll up well. Otherwise I love it!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 18, 2026
★★★★★ 3
Cute but pills
Size: 3X, Color: Chocolate
Runs a little big. I’m good with that. The style and brown color are great! I love the wide sleeves. The material is very soft and cozy…but I wore it once for 3 hours and the sides and stomach area pilled. I am disappointed. I am going to hand wash it and see what it looks like. I may need to return it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 27, 2022
★★★★★ 5
Perfect little set! Get both
Size: Small, Color: Porpoise
Such a soft sweater! You have to get the matching set! The quality is amazing and the material is nice and thick for those chilly days! The set feels like a more expensive brand so you get a good deal! I washed it and it did not shrink and the color did not fade. I hung to dry and the fabric still looks perfect!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 7, 2025
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