Ronstan Series 75 Orbit Block, Single

Manufacturer part #: RF791001

Manufacturer part #: RF79100

The highest strength-to-weight ratio

Minimal friction loss, especially when working at high loads

Totally reliable and trouble free performance

Simplicity of design and construction to facilitate maintenance and servicing

Elegant, functional styling and finish

Lockable swivelling head post

High strength forged shackle

Orbit blocks™ are a no-compromise product range developed to meet the demands and expectation of the very dedicated and increasingly professional racing sailor. Side cheeks incorporating head structure and hub are precision machined as a single part from solid alloy, leaving material only where it contributes to the load carrying capacity of the block and eliminating the need for additional fasteners.

The Orbit sheave has captive Acetal ball bearings for side thrust loads, eliminating the need for side retainer plates. This reduces weight and allows for a wider bearing surface that can accommodate longer Torlon° needles  – achieving a substantially higher strength-to-weight ratio.Head posts of swivel blocks can be locked at 0 or 90 degrees.

Applications

Primary mainsheet, halyard and spinnaker systems on boats to 14 m (46 ft)

Secondary mainsheet, vang blocks on boats to 15 m (50 ft)

Standard and running backstay systems on boats to 12 m (40 ft)

General control line and lead block applications on larger yachts

Materials

Fully machined Alloy cheek plates

Alloy sheaves with captive ball races

Torlon° needle rollers

Carbon black Acetal ball bearings

Forged grade 17-4PH stainless steel shackles

Grade 316 stainless steel head post