Description

Ronstan Series 75 Ratchet Block

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 RF72000.

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.

Specifications:

• Max. Rope diameter (in): 1/2
• Sheave diameter (in): 3

Applications:

• Dinghy mainsheet systems – when maximum holding power is required.
• RF72100 mainsheet systems on sportsboats using RF7 mainsheet swivel cleat unit.
• Control line applications on larger yachts.

Materials:

• Sheave & cheek plates: Anodised aluminium.
• Ball bearings: High compression strength acetal.
• Ratchet pawl: High strength Torlon.
• Swivel shackle head fitting: Grade 316 stainless steel.