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Description
Ronstan 45mm Single/Swivel Halyard Core BlockProduct Description Ronstan 45mm Single Swivel Halyard Core Block 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 aluminum alloy cheek plates Central hub hole can be used as a becket take off or tie up point Measurements Sheave 1 3 4 in. (45mm) Max. Rope 1 2 in. (12mm) Max. Cable in (mm) Pin 3 16 in. (5mm) M.
Product Description
Ronstan 45mm Single/Swivel Halyard Core Block
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 aluminum alloy cheek plates
Central hub hole can be used as a becket take-off or tie-up point
Measurements
Sheave Ø - 1 3/4 in. (45mm)
Max. Rope Ø - 1/2 in. (12mm)
Max. Cable Ø - in (mm)
Pin Ø - 3/16 in. (5mm)
M.W.L. - 1540 lb. (700kg)
B. L. - 3090 lb. (1400kg)
Weight - 4.2 oz. (121g)
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 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.
Applications
Ideal for mainsheet, halyard and spinnaker sheet applications on boats to 10m (33ft).
Various control line applications on larger yachts.
Alloy sheave models are available for use with wire.
Materials
Sheave: U.V. stabilized Acetal
Cheek body: Aluminum Alloy
Ball Bearings: High compression strength carbon black Acetal
Shackle, head post & hub: Grade 316 stainless steel
Features:
Measurements
Sheave Ø - 1 3/4 in. (45mm)
Max. Rope Ø - 1/2 in. (12mm)
Max. Cable Ø - in (mm)
Pin Ø - 3/16 in. (5mm)
M.W.L. - 1540 lb. (700kg)
B. L. - 3090 lb. (1400kg)
Weight - 4.2 oz. (121g)
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 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.
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
4.4 ★★★★★
Based on 19 reviews
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Product Reviews
★★★★★ 5
The only phone mount for a taco
This is a really quality product. So quality that I wish they made this for some of my other cars, I don't ever wanna use another phone holder. I was a bit skeptical on the longevity of the spring that holds it open, but a few months later and it feels just as sturdy as new. Fit is immaculate, the phone stays put. Worth the price. You will see when you see the machine finish on this product.
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Reviewed in the United States on March 25, 2025
★★★★★ 5
Fantastic Mount especially on rough Roads
Robust and discretely positioned mount. This mount is the real deal. It is by far the highest quality most stable mount that I've ever had in my Tacoma pickup. I also really like that it's positioned closer to the steering wheel in instead of in the windshield, making it easier to view. Very highly recommended!!
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Reviewed in the United States on January 27, 2026
★★★★★ 5
Perfecto Product!!
I rarely write reviews, however on this product I need too. This clearly is a pricey phone mount, but after reading so many reviews I went for it & purchased. After opening, I immediately could see & feel the quality of material used. Installation was surprisingly easy & quick to my Tacoma. The mount is very firm, sturdy, very adjustable, perfectly designed product. For as costly as this was, I have absolutely no regrets! Totally can recommend this product to anyone with a Tacoma within the stated production years. So as so many others have said accurately in reviews, I am beyond satisfied even with the cost in mind.
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Reviewed in the United States on June 8, 2023
★★★★★ 5
Perfect fit for my 2018 sr5 Tacoma. Great quality!
Extremely well made. Doesn't rattle or slide off. Holds the phone tightly. Finally found a phone mount that works great for my Tacoma (2018 sr5). I highly recommend this product.
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Reviewed in the United States on December 5, 2025
★★★★★ 5
5 Stars with 1 Call-Out….
SOLID built like a tank! Really like the all-metal design. No vibration on the road and minimal if any off road, extremely stable. 360 adjustability = endless options on positioning your phone. Overall a good buy considering fit, form and functionality as compared to the less expensive composite holders that shake move and rattle (Drives me nuts). The ONLY negative…. I have a pro max iphone with a case and there’s no way one-handed operation works to insert and remove the phone into the holder. You can use one hand to adjust the angle and positioning but not otherwise. An OFI for OffRoam, incorporate a tension adjustment into the design for ease of insertion and removal of the phone (without breaking the bank). Taking all things into consideration the pros far outweigh the cons! Best unit out there for Gen 3 Tacoma owners.
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Reviewed in the United States on February 14, 2026