Pay in installments of $17.20 with
,
and
Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 17 - Jul 22
Promo Codes Available:
For Your Every Summer RSVP, with Code: SUMMER15
Description
Ronstan 60mm Mast Base, 8mm (5/16") Clevis Pin Head Core BlockProduct Description Ronstan 60mm Mast Base, 8mm (5 16") Clevis Pin 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 Suits attachment to 14mm (9 16) wide mast collar post Removable 8mm (5 16) clevis pin at head
Product Description
Ronstan 60mm Mast Base, 8mm (5/16") Clevis Pin 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
Suits attachment to 14mm (9/16”) wide mast collar post
Removable 8mm (5/16”) clevis pin at head
Measurements
Sheave Ø - 2 3/8 in. (60 mm)
Max. Rope Ø - 1/2 in. (12 mm)
Max. Cable Ø - in (mm)
Pin Ø - 5/16 in. (8 mm)
M.W.L. - 2200* lb. (1000* kg)
B. L. - 4410* lb. (2000* kg)
Weight - 6.4 oz. (182 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 mainsheet, halyard and spinnaker sheet applications on boats to 12m (40ft).
Various control line 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 - 2 3/8 in. (60 mm)
Max. Rope Ø - 1/2 in. (12 mm)
Max. Cable Ø - in (mm)
Pin Ø - 5/16 in. (8 mm)
M.W.L. - 2200* lb. (1000* kg)
B. L. - 4410* lb. (2000* kg)
Weight - 6.4 oz. (182 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 23 reviews
Sort
Product Reviews
★★★★★ 4
Well worth the read
Format: Paperback
Good read.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 9, 2021
★★★★★ 5
Great vitamin capsules
Most multivitamins have an awful odor that turns me off from using them. Each of these capsules encases the contents in a lining that blocks the smell and is easy to swallow, which then dissolves in the stomach. It's a great solution for me.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 23, 2025
★★★★★ 5
Life changing for me!
I never write reviews but these are AWESOME! I have had low iron for about 10 years and nothing I’ve tried in the past (changing my diet, other multi-vitamins, prescribed iron supplements, etc.) has ever gotten rid of the fatigue that comes with it. I started taking these about a month ago and I feel like a brand new person! I can get through the day without taking a nap or multiple, which has bettered not only my sleep schedule but my productivity all around! I could not recommend enough. They do have a nasty smell but I just breathe through my mouth until I’ve swallowed it lol. The smell is 100% worth the outcome in my opinion.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 16, 2025
★★★★★ 5
Ordered multiple times and am pleased!
I got these when one a day stopped making the gelcap minis that I loved and used for years. I prefer gelcaps over tablets for better absorption, and these don't disappoint at all. They're good quality, as I notice the difference when I don't take them. They're easy to swallow despite being a somewhat larger capsule, and very comparable in contents and values to the ones I took before. I feel better when I take them, and that's enough for me. Shipping was fast and they arrived undamaged, every time I've ordered them.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 30, 2025
★★★★★ 5
The Perfect Liquid Gel-Cap Multivitamin
My doctor asked me to take a multivitamin in liquid form, as the vitamins are absorbed so much better than with a pressed-powder tablet. These are not easy to find locally! I have been using these vitamins for quite a while and order more when I am getting close to running out. I was pleased to find them on Amazon at a good price. I had bought others online, but the price was considerably more for a comparable product. There is no aftertaste, and they are easy for me to swallow. They are large, so they may not be for everyone, but they solved a problem for me.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 2, 2026
recommand products
U03155 John Deere 7R 350 with front loader and trailer
80.64
New Holland T7.315 tractor with horse trailer
35.33
Bill Moose Skowron Autographed Baseball - Player's Closet Project
100.00
Frank Robinson Autographed Baseball - Player's Closet Project
200.00
Hyundai Genuine (Mobis) Part No.: 865672W000 Part Name PAD-REAR BUMPER,UPR
381.50