Ronstan Series 40 Ball Bearing Orbit Block, Single,Swivel
Shipping and Delivery
Enjoy free shipping on qualifying orders of $145 or more delivered within the 48 contiguous United States. Alaska, Hawaii, Puerto Rico, and other U.S. territories are excluded.
Delivery for qualifying free-shipping orders takes 8 to 10 business days.
Free shipping does not apply to:
- Orders containing only clearance items
- Customized special orders made to your detailed requirements
- Sails and boats
- Long tracks, spinnaker poles, whisker poles, and large tubes
- Oversized or heavy items, including items that require less-than-truckload (LTL) freight shipping
Standard Shipping
- UPS and FedEx Ground: Delivery usually takes 2 to 5 business days for in-stock orders.
- USPS: Allow an additional 3 business days beyond the standard shipping time.
- Saturday delivery: UPS and FedEx deliver on Saturdays only for overnight shipments sent on Friday. Additional charges may apply.
Oversized Items and Freight Shipping
Oversized items, such as whisker poles, spinnaker poles, and tracks longer than 8 feet, require freight shipping. The estimated shipping cost is $500, depending on the destination.
For freight deliveries, provide a commercial address, such as the marina, yacht club, or boatyard where your sailboat is located. The recipient must sign for the shipment upon delivery.
International Orders
International customers are responsible for all applicable import duties, fees, and taxes.
Ronstan Series 40 Ball Bearing Orbit Block, Single,Swivel
The new Series 40 ball bearing Orbit Blocks provide the perfect balance of strength, performance, and reliability. They offer class-leading dynamic and static load ratings, the highest available in this size of performance blocks. Lightweight and strong toughened glass fibre reinforced nylon cheeks replace stainless steel straps used in traditional utility blocks - the perfect balance of performance and reliability.
The RF48100 Single Block features a 40mm (1 9/16") sheave and incorporates our 2-stage bearing system. Ball bearings minimise friction while a secondary full-contact bearing maintains low friction across the full working load range. This product does not have a locking headpost, which is only available in the multiple sheave variants. RF48100 is free swivel rotation only. The RF48100 can accommodate a maximum rope diameter of 10mm (3/8").
Specifications:
- Max. Rope diameter (in): 3/8
- Sheave diameter (in): 1 9/16
Applications:
- Mainsheet systems and spinnaker sheets on dinghies, off-the-beach catamarans and sportsboats to 8m (26ft).
- Halyard, vang, and backstay applications on boats to 8m (26ft).
- Control line applications on larger yachts.
Materials:
- Sheave and Ball Bearings: High compression strength acetal.
- Frame/cheeks: Toughened, glass fibre reinforced nylon.
- Head fittings, hubs, and fixtures: Grade 316 stainless steel.
Ronstan Series 40 Ball Bearing Orbit Block, Single,Swivel
The new Series 40 ball bearing Orbit Blocks provide the perfect balance of strength, performance, and reliability. They offer class-leading dynamic and static load ratings, the highest available in this size of performance blocks. Lightweight and strong toughened glass fibre reinforced nylon cheeks replace stainless steel straps used in traditional utility blocks - the perfect balance of performance and reliability.
The RF48100 Single Block features a 40mm (1 9/16") sheave and incorporates our 2-stage bearing system. Ball bearings minimise friction while a secondary full-contact bearing maintains low friction across the full working load range. This product does not have a locking headpost, which is only available in the multiple sheave variants. RF48100 is free swivel rotation only. The RF48100 can accommodate a maximum rope diameter of 10mm (3/8").
Specifications:
- Max. Rope diameter (in): 3/8
- Sheave diameter (in): 1 9/16
Applications:
- Mainsheet systems and spinnaker sheets on dinghies, off-the-beach catamarans and sportsboats to 8m (26ft).
- Halyard, vang, and backstay applications on boats to 8m (26ft).
- Control line applications on larger yachts.
Materials:
- Sheave and Ball Bearings: High compression strength acetal.
- Frame/cheeks: Toughened, glass fibre reinforced nylon.
- Head fittings, hubs, and fixtures: Grade 316 stainless steel.


