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Description
Ronstan 100mm Single Core BlockProduct Description Ronstan 100mm Single Core Block Features High dynamic and static load capacity High load 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 Also available in Series 45, 60 & 75 Universal head with full 3 axis articulation Head posts can be locked at 0 or 90
Product Description
Ronstan 100mm Single Core Block
Features
High dynamic and static load capacity
High load 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
Also available in Series 45, 60 & 75
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
Alloy Rope/Wire sheave version also available
Central hub hole can be used as a becket take-off or tie-up point
Specifications:
Sheave Ø - 4 in. (100mm)
Max. Rope Ø - 3/4 in. (18mm)
Max. Cable Ø - in (mm)
Pin Ø - 3/8 in. (10mm)
M.W.L. - 7150 lb. (3250 kg)
B. L. - 16500 lb. (7500 kg)
Weight - 31.8 oz. (900 g)
Applications:
Ideal for mainsheet, spinnaker sheet, vang, halyard and backstay applications on boats to 16m (53ft).
General applications on larger yachts.
Materials:
Bearings: High compression strength, self-lubricating acetal
Head post: Grade 2205 stainless steel
Shackles: Grade 17-4PH stainless steel
Padeye: Grade 15-5PH stainless steel
Other fixtures: Grade 316 stainless steel
Shackle, post & hub: Grade 316 stainless steel.
Features
Specifications:
Sheave Ø - 4 in. (100mm)
Max. Rope Ø - 3/4 in. (18mm)
Max. Cable Ø - in (mm)
Pin Ø - 3/8 in. (10mm)
M.W.L. - 7150 lb. (3250 kg)
B. L. - 16500 lb. (7500 kg)
Weight - 31.8 oz. (900 g)
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
4.5 ★★★★★
Based on 22 reviews
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Product Reviews
★★★★★ 3
Better options for the price
Color: Black Watch-G5010, Color: Black Watch-G5010
While having a striking appearance, the band has many rough edges and pulls your arm hairs. It is a good size and looks good at the surface level, but it is very light almost to the point that it feels cheap or not durable. This makes the price feel unnecessary, especially when compared to other more substantial or quality feeling options at this price point and below. If you just need a watch, it’ll do but I felt that it fell short in places, especially the band.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 18, 2025
★★★★★ 5
Beautiful Watch, and easy to set up.
Color: 5535-ZP-blue
Looks classy, very easy to set the time, day of the week, and date. It is a class cover so it can break if dropped (my kids broke my first one), but it's inexpensive so it wasn't a huge deal. It's easy to read. Battery hasn't died for months. It's easy to put on and the size works for me.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 27, 2026
★★★★★ 5
Runs like a Rolex
Color: 5535-ZP-blue
What a watch!! A very nice watch. Everyone asks if it is a Rolex!! I say NO but it keeps me on time like a Timex. The band is wearing a little quickly but otherwise thumbs up!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 4, 2025
★★★★★ 1
Most important review for this watch and company.
Color: 5566-ZP-blue face, Color: 5566-ZP-blue face
I bought two and they both broke. Customer service has ignored my e-mail. What more do you need to know about a company? I personally wrote them through their own website, so they could keep Amazon out of it. It makes me angry that they won't even reply to my e-mail. I was nice. Both watches broke, neither one if actually water proof. The band is exceptionally thin and it WILL break on you once it arrives. It's so poor, that my body moisture is what got into the face of the watch. What the heck? I've had better 9 dollar watches from Walmart. Zero out of zero for the COMPANY who doesn't care about their customers, and zero out of ten for watch quality. Useless. I wasted 60-80 bucks on two of these! BOTH BROKE! and in more than one way!!!!! Terribly marked up (this is less than a 10 dollar Walmart watch - quality is LOWER than the lowest 3 dollar watches off Temu, Shien, Walmart), customer service is non-existent, and the band WILL BREAK on you. It's worthless. Take your money somewhere else. Attached pictures show the moisture leak from my sweat, but in real life, it's actually much worse. Worthless, not usable. Two of them folks. TWO!
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Reviewed in the United States on May 2, 2026
★★★★★ 5
Quality Watch
Color: 5566-ZP-white face
A very nice looking inexpensive watch for work if you are in a job that you don't want to wear an expensive watch.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 15, 2026
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