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Description
Ronstan Orbit Series 40 Cheek BlockProduct Description Ronstan Orbit Series 40 Cheek Block Features Ultra Lightweight Low friction 2 stage Orbital ball bearing system Highest working load in its class Easily fitted and securely retained Dyneema Link head Low profile and compact High performance cleating Recessed underside to suit curved mounting surface Low mounting points for maximum strength Sheave 1 9 16 in. Max. Rope 5 16 in. Max. Wire in. Pin in. Max. Working Load 715 lb B. L.
Product Description
Ronstan Orbit Series 40 Cheek Block
Features
Ultra Lightweight
Low friction 2-stage Orbital ball bearing system
Highest working load in its class
Easily fitted and securely retained Dyneema® Link head
Low profile and compact
High performance cleating
Recessed underside to suit curved mounting surface
Low mounting points for maximum strength
Sheave Ø - 1 9/16 in.
Max. Rope Ø - 5/16 in.
Max. Wire Ø - in.
Pin Ø - in.
Max. Working Load - 715 lb
B. L. - 1540 lb
Weight - 1.1 oz
Product Information
Lightweight
Kilogram for kilogram of working load, BB and RT Orbit Blocks™ are the world’s lightest. To gain peak performance, we engineered out the heavy steel load straps, head post, shackle, full-length fasteners, and cleating accessories. Through extensive research and development, we replaced virtually all metal components with high-tech polymers and fiber equivalents.
The unique orbital design allows the bearing to only be in the active areas of the floating sheave. This minimizes the mass of the inactive return race and hub.
Weight and bulk are further reduced in the different block configurations. The ball bearing single and becket block has a through-sheave becket arrangement. The result? The lowest weight possible.
Multi-sheave blocks have only single intermediate cheeks and an ultra-light and efficient head arrangement. This gives a 30% weight saving advantage over the nearest competitor. Other brands just link together their single blocks. This results in unnecessary double cheeks between each sheave, held together by a heavy steel channel across the top of the block.
Highest working load in its class
The orbital ball-bearing arrangement gives the largest possible bearing race diameter. This maximizes load performance. The proven Ronstan 2-stage bearing system features high compression grade acetal ball bearings and a secondary full-contact bearing. This gives minimum friction across the full working load range.
The floating sheave and bearing system is supported by a fiber-reinforced load frame. The design was computer modeled to be stress optimized. The Dyneema Link is produced from FSE Robline SK75 fiber, which is 10 times stronger and lighter than steel, and provides the final connection from the block to the load point.
Simple and secure attachment
The Dyneema Link is easily fitted and is retained securely by a molded retainer clip. The flexible link can be left with one end attached to the block when fitting - no more lost shackle pins.
The system is compatible with Dyneema Spectra strops, webbing and carbon connection points - much more so than steel loop tops or shackles.
Low profile and compact
The flexible Dyneema Link provides controlled rotation and 0° or 90° orientation. It connects directly to the head of the block rather than to an intermediate head post. This reduces weight and gives the lowest possible profile while allowing full articulation. Beckets have been carefully designed to minimize height.
Fiddle block flexibility
Becket fiddle blocks use a Dyneema® Link attachment for the sheet termination and are suitable for both spliced and unspliced lines. If you need additional purchase, a becket take-off can be simply added to any fiddle block version just by adding a Dyneema® Link.
Applications
Mainsheet systems on spinnaker sheet on dinghies to 5m (16ft)
Spinnaker sheets on dinghies, sportsboats and small keel boats to 5m (16ft)
Halyard, vang and backstay applications on boats to 8m (26ft)
Control line applications on larger yachts
Materials
Ball Bearings - High compression strength carbon black Acelta.
Stage 2 Bearing - Glass fiber reinforced, MoS2 impregnated Nylon
Frame/Cheeks - Toughened, glass fiber reinforced Nylon
Rope/Link - UV stabilized, multi-strand impregnated SK75 Dyneema®
Sheave - Carbon fiber reinforced, PTFE impregnated Nylon
Features
Sheave Ø - 1 9/16 in.
Max. Rope Ø - 5/16 in.
Max. Wire Ø - in.
Pin Ø - in.
Max. Working Load - 715 lb
B. L. - 1540 lb
Weight - 1.1 oz
Product Information
Lightweight
Kilogram for kilogram of working load, BB and RT Orbit Blocks™ are the world’s lightest. To gain peak performance, we engineered out the heavy steel load straps, head post, shackle, full-length fasteners, and cleating accessories. Through extensive research and development, we replaced virtually all metal components with high-tech polymers and fiber equivalents.
The unique orbital design allows the bearing to only be in the active areas of the floating sheave. This minimizes the mass of the inactive return race and hub.
Weight and bulk are further reduced in the different block configurations. The ball bearing single and becket block has a through-sheave becket arrangement. The result? The lowest weight possible.
Multi-sheave blocks have only single intermediate cheeks and an ultra-light and efficient head arrangement. This gives a 30% weight saving advantage over the nearest competitor. Other brands just link together their single blocks. This results in unnecessary double cheeks between each sheave, held together by a heavy steel channel across the top of the block.
Highest working load in its class
The orbital ball-bearing arrangement gives the largest possible bearing race diameter. This maximizes load performance. The proven Ronstan 2-stage bearing system features high compression grade acetal ball bearings and a secondary full-contact bearing. This gives minimum friction across the full working load range.
The floating sheave and bearing system is supported by a fiber-reinforced load frame. The design was computer modeled to be stress optimized. The Dyneema Link is produced from FSE Robline SK75 fiber, which is 10 times stronger and lighter than steel, and provides the final connection from the block to the load point.
Simple and secure attachment
The Dyneema Link is easily fitted and is retained securely by a molded retainer clip. The flexible link can be left with one end attached to the block when fitting - no more lost shackle pins.
The system is compatible with Dyneema Spectra strops, webbing and carbon connection points - much more so than steel loop tops or shackles.
Low profile and compact
The flexible Dyneema Link provides controlled rotation and 0° or 90° orientation. It connects directly to the head of the block rather than to an intermediate head post. This reduces weight and gives the lowest possible profile while allowing full articulation. Beckets have been carefully designed to minimize height.
Fiddle block flexibility
Becket fiddle blocks use a Dyneema® Link attachment for the sheet termination and are suitable for both spliced and unspliced lines. If you need additional purchase, a becket take-off can be simply added to any fiddle block version just by adding a Dyneema® Link.
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
4.7 ★★★★★
Based on 6 reviews
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Product Reviews
★★★★★ 5
Pokemon Slip on Shoes
Size: 3 Big Kid, Color: Black
My grandson loved the shoes, however, the size I ordered was too small.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 6, 2024
★★★★★ 5
Great shoes!
Size: 1 Big Kid, Color: Grey
This is my granddaughter’s second pair. She wore out and grew out of her first pair. Loves them. Was so excited to get a brand new pair.
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Reviewed in the United States on April 25, 2025
★★★★★ 5
Great Hose
Size: 100ft, Color: Black
amazing product, exactly as described, nossle attached and ready for use. Hose fills up easily and expands , no issues, very light weight
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 3, 2026
★★★★★ 5
The perfect hose?
Size: 50ft, Color: Black
I bought two cheaper hoses prior to this hose, and both of them were unusable. One so stiff it could barely uncoil and the other was soft, but would tangle and kink as soon as turned on.
This hose is perfect and has neither of those problems - it doesn’t kink or get tangled and it is soft and pliable and lightweight. It’s small when not in use and expands when turned on. The fact that it contracts when turned off, makes it easy to get the water out of the hose.
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Reviewed in the United States on May 8, 2026
★★★★★ 5
Best water hose to buy
Size: 150ft, Color: Black
excellent sprayer included and best hose to buy...flexible & expands even further than advertised, Sturdy and allows full stream of water flow without any kinks in hose line. good buy! easy to use..made of strong material to handle outdoor environment over time. I BOUGHT 3 MORE!
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Reviewed in the United States on May 14, 2026