Description
Ronstan Series 75 Low Pivoting Ratchet Block – RF72174:
Features:
- Unrivalled 20:1 holding power.
- Dual sided On-Off switch.
- Ability to operate On/Off switch under load.
- Low friction ball bearing system.
- Lightweight.
- Cheek cut-outs for easy bearing maintenance.
The patented extruded hole design, in conjunction with the groove profile of the sheave, provides a more powerful grip than conventional designs – up to 20:1 holding power. Unrivalled low weight is achieved by the use of a Torlon® ratchet pawl, high grade machined alloy sheave and black Acetal hubs and bearings. On-Off switching knob is fitted to both sides of the swivel blocks (one can be removed if desired). Ratchet blocks can be disassembled for sheave replacement with RF62000.Maintains alignment with a variable line entry-angle. The line passes through the centre of the pivot support, remaining as close to the deck as possible. The patented extruded hole design, in conjunction with the groove profile of the sheave.
Applications:
- Mainsheet on powerful dinghies and skiffs.
- Series 60 mainsheet systems on sports boats using RF7 mainsheet swivel units.
- Control line applications on larger yachts.
- Spinnaker sheets on sports boats and small keel boats (lateral lead blocks).
| Product No | Sheave Dia mm (in) | Max Rope Dia mm (in) | Max Working Load kg (lb) | Break Load kg (lb) | Weight g (oz) | Pin Dia mm (in) | Fasteners mm (in) |
|---|---|---|---|---|---|---|---|
| RF72100 | 75 (3) | 12 (1/2) | 420 (930) | 2000 (4410) | 162 (5.7) | 7 (9/32) | - |
| RF72174 | 75 (3) | 12 (1/2) | 420 (930) | 1370 (3020) | 270 (9.5) | - | 6 (1/4) |
| RF72175 | 75 (3) | 12 (1/2) | 420 (930) | 1370 (3020) | 405 (14.3) | - | 6 (1/4) |
