Series 55 Ball Bearing Orbit Block™ - Single - Becket - Swivel Head - Ronstan RF55110
Lightweight
Kilogram for kilogram of working load, BB and RT Orbit Blocks™ are the world's lightest. The unique orbital design allows the bearing to only be in the active areas of the floating sheave. This minimises 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 maximises 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 modelled to be stress optimised. 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.
Features:
- Ultra Lightweight
- Low friction 2-stage Orbital ball bearing system
- Highest working load in its class
- Low profile and compact
- High performance cleating
- Swivel shackle head for unlimited block rotation
- Stainless steel shackle head for ultimate durability and compatibility with harsh fixing points
- Ultra low profile integrated becket
Applications:
- Mainsheet systems on dinghies, sportsboats and small keelboats to 9M(30')
- Spinnaker sheets on dinghies, sportsboats and small keel boats to 9M(30')
- Halyard, Vang and Backstay application on boats to 8M(26')
- Control line applications on larger yachts
- Ideal use for mainsheet systems and spinnaker sheets on dinghies, sportsboats and small keel boats to 9M(30')
- Also ideal with halyard, vang and backstay applications on boats to 8M(26')
- Spinnaker sheets on sportsboats and small keel boats (lateral lead blocks)
- Control line applications on larger yachts
Materials:
- Ball bearings - High compression strength carbon black Acetal
- Stage 2 bearing - Carbon fiber reinforced, PTFE impregnated Nylon
- Frame/Cheeks - Toughened, glass fiber reinforced Nylon
- Rope Link: UV stabilized, multi-strand impregmented SK75 Dyneema®
- Sheave: Carbon fiber reinforced, PTFE impregnated Nylon
- Head fitting: Grade 316 stainless steel.
Specifications:
Sheave Ø: 55mm(2-5/32")
Max. Rope Ø: 10mm(3/8")
M.W.L.: 500kg(1,100lbs)
B. L.: 1,000kg(2,200lbs)
Weight: 88g(3.1oz)
Shipping Method – Ground (smaller items)
Standard shipping method is ground shipping with FedEx or UPS. Delivery signature is not required for ground shipments. The carrier will leave the package in the normal delivery place for your address. You may go to FedEx or UPS website to track your shipment. Occasionally, your package may not be delivered due to weather conditions or a concern for the package safety. This decision is made by the carrier. Very small items may ship USPS.
If you are purchasing multiple items from different manufacturers, your order will ship from different warehouses and may ship on different dates. We will email you all the tracking associated with your shipment once the item ships from the warehouse. If your order contains multiple ground shipments, then they may ship with a Freight carrier based on the number of items and weight.
Shipping Method – Freight
Standard shipping method for large / heavy items is with a freight carrier. Delivery signature IS required for freight shipments and you will need to be present during your delivery time window. For residential deliveries, the freight carrier will contact you to schedule delivery date. You may go to the freight carrier’s website to track your shipment.
If you are purchasing multiple items from different manufacturers, your order will ship from different warehouses and may ship on different days. We will email you all the tracking associated with your shipment.
Freight shipments are curbside delivery.
Upon delivery, if you notice any damage to the box/item you MUST note this on the delivery receipt.
| Manufacturer Part Number | RF55110 |
|---|---|
| Brand | Ronstan |