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Description
Ronstan 45mm Stand-Up Core BlockProduct Description Ronstan 45mm Stand Up 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. (mm) M. W. L. 1540
Product Description
Ronstan 45mm Stand-Up 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. (mm)
M.W.L. - 1540 lb. (700kg)
B. L. - 3090 lb. (1400kg)
Weight - 5.3 oz. (151g)
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. (mm)
M.W.L. - 1540 lb. (700kg)
B. L. - 3090 lb. (1400kg)
Weight - 5.3 oz. (151g)
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
4.2 ★★★★★
Based on 6 reviews
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Product Reviews
★★★★★ 3
Alot of work to assemble
Color: Black, Number of Items: 2
I love the table but it is a nightmare to put together. Just beware
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Reviewed in the United States on February 22, 2026
★★★★★ 5
Wonderful
Color: Black, Number of Items: 2, Color: Black, Number of Items: 2
I.love them
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Reviewed in the United States on March 16, 2026
★★★★★ 1
Dont like them
Color: Black, Number of Items: 2
Too small
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Reviewed in the United States on March 24, 2026
★★★★★ 5
Very Nice!
Color: Black, Number of Items: 1
This end table is very well made and uses good quality hardware throughout. It is assembled using cam lock nuts, wooden dowels, and Allen head bolts, which I personally prefer over standard wood screws. Cam locks stay tight over time and do not slowly work themselves loose like screws can on furniture that gets regular use, so that was a big plus for me right away.
The table arrives fully disassembled. For someone comfortable with furniture assembly, it took just over an hour to put together. The instructions are clear, well laid out, and easy to follow. I would rate the overall assembly difficulty around a 2 to 3 out of 5. Most of the process is straightforward and logical. There is only one frustrating step where you need to tighten eight bolts with an Allen wrench in a very tight space near the bottom tray. There is not enough clearance to fully rotate the wrench, so tightening those bolts takes a lot longer than it should. Other than that one section, the rest of the build went smoothly.
Once assembled, the table feels very solid and sturdy with no wobble. The finish held up well during assembly and I did not experience any scratching or chipping, which tells me it is fairly durable. The design is sturdy enough that it works well as an everyday end table without feeling delicate.
Functionally, the built in charging station works great. The power cord and outlets are convenient, and the charging base is very handy for phones and other devices. My only minor complaint is that I wish the power cord routed through the bottom of the stand instead of exiting straight out the back of the middle tray. It is not a deal breaker, but a bottom exit would make cable management a bit cleaner.
Storage space on the shelves is somewhat limited due to the design, but there is still enough room to be functional. It works well for books, small baskets, remotes, or decorative items. Just do not expect oversized storage.
Overall, this is a high quality, well designed piece with solid hardware and a clean look. If this style fits your space, I would absolutely recommend it. I am very happy with mine and would buy it again.
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Reviewed in the United States on January 28, 2026
★★★★★ 5
Beautiful end table that works well anywhere.
Color: Black, Number of Items: 1
The JUSTOGO end table immediately stands out thanks to its unique, modern design and practical features. Its rectangular shape makes it surprisingly versatile. You can position it to showcase the three open shelves for easy access and display, or use it as a narrower separation piece or traditional end table. That flexibility makes it adaptable to different rooms and layouts.
One of the most thoughtful design choices is the placement of the built-in USB ports and power outlets. Located on the middle shelf, they don’t crowd the tabletop and still remain easily accessible for charging devices. This keeps the top surface clean and fully usable while ensuring cords aren’t stretched too far.
The black finish is another plus. It’s neutral, clean-looking, and blends easily with a wide range of décor styles.
If there’s a downside, it’s the assembly process. The instructions could be clearer, and while the advertised setup time is 20 minutes, it realistically takes closer to 40. That said, assembly is a one-time task, and once it’s complete, you’re left with a sturdy, functional, and visually appealing piece of furniture. Overall, it’s a smart combination of style and utility.
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Reviewed in the United States on February 13, 2026