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Ronstan Orbit Ball Bearing Block™ - Double Block
Ronstan Ball Bearing Orbit Blocks™ feature the unique orbital version of the Ronstan 2 stage bearing system. Recirculating ball bearings are positioned exclusively in the loaded area of the sheave and a second full contact bearing maintains low friction across the full working load range. Combined with composite reinforced polymer materials, Orbit Blocks™ offer maximum strength to weight ratio for high load and dynamic applications.
Double Orbit blocks feature either a conventional 316 (A4) stainless steel shackle which provides full rotation and ultimate durability, or a secure, versatile non-swivel stainless shackle head.
Built-in Becket - Orbit blocks have low profile moulded check plates optimized for use with the through sheave becket system, ultra-low profile and light weight.
Double blocks are recommended for the following applications:
- Mainsheet systems¹
- Halyard, vang and backstay applications²
- Control lines on larger boats
| Ref. | Sheave mm |
Maximum Line Ø mm |
Working Load kg |
Breaking Load kg |
Shackle Pin Ø mm |
Weight g |
1. Max boat length | 2. Max boat length |
| RF35202 | 30 | 8 | 450 | 900 | - | 56 | 5 m | 5 m |
| RF55210 | 55 | 10 | 750* | 1500* | 5 | 172 | 9 m | 8 m |
* The loads indicated are the maximum loads of the block. Load on the built-in becket not to exceed 33% of block load.
| Code | Ronstan Orbit Block™ | Availability | Price | |
|---|---|---|---|---|
|
RONSTAN RF35202
|
3 days
|
€37.99 (inc. VAT)
€31.40 (ex. VAT) |
|
|
RONSTAN RF55210
|
3 days
|
€86.95 (inc. VAT)
€71.86 (ex. VAT) |
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