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Ronstan Core Block - Single Swivel Block
Shipping Costs:
We are unable to ship to some destinations due to weight/volume or Shipping Restrictions.
Incredibly smooth running, long lasting block thanks to the aluminium cheek plates and the Ronstan Universal Bearing 2-stage bearing system. An acetal sheave and stainless fixings complete the durable package.
For reliability and a long service life, these blocks are recommended for mainsheet, halyard, vang and spinnaker sheet applications on boats up to 16m (60ft) and general / control line applications on larger yachts. The 45 mm block is great for furling lines, and other control lines where strength and durability are required.
Features:
- Class leading performance and sleek, contemporary styling.
- Excellent dynamic and high static load performance.
- Less than half the friction of the nearest competitor.
- Universal head can be fixed at 0° or 90° or left free to swivel.
- Head posts can be locked at 0 or 90 degrees, by using a 2.5mm Hex/Allen Key.
- Central hub hole can be used as a becket take-off or tie-up point.
- Alloy Rope/Wire sheave version also available.
| Ref. | Size / Sheave | Working Load kg |
Break Load kg |
Maximum Line Size mm |
Shackle Pin Diameter mm |
Weight g |
Recommended Boat Size for Mainsheet |
| RF44100 | 45 mm | 700 | 1400 | 12 | 5 | 104 | 10 m (33 ft) |
| RF64100 | 60 mm | 1000 | 2000 | 12 | 6 | 235 | 11 m (36 ft) |
| RF74100 | 75 mm | 1500 | 3000 | 14 | 8 | 354 | 14 m (46 ft) |
| RF104100 | 100 mm | 3250 | 7500 | 18 | 10 | 900 | 16 m (60 ft) |
