Ronstan Series 40 Orbit BB Quad Block w/Swivel Shackle

The Ronstan Series 40 Orbit BB quad block brings four sheaves and a swivel shackle to sailing line-control systems. Sailors can use it for mainsheet, spinnaker sheet and other listed control applications, with a two-stage bearing arrangement that reduces friction as loads change.

Key features

• Ball bearings reduce friction to ease line trimming.
• A secondary full-contact bearing keeps friction low across the working load range.
• Toughened glass-fibre-reinforced nylon cheeks provide strength while keeping weight down.
• A compact, low-profile form limits the space occupied by the block.
• A swivel shackle provides a traditional attachment option.

Specifications

• Series: 40 Orbit BB
• Configuration: Quad block with swivel shackle
• Cheek material: Toughened glass-fibre-reinforced nylon
• Bearing system: Two-stage ball bearing and full-contact bearing
• Sheave diameter: 1-9/16 in.
• Maximum rope diameter: 3/8 in.
• Pin diameter: 5/32 in.
• Maximum working load: 1320 lb.
• Breaking load: 2650 lb.
• Weight: 6.8 oz.

Good to know

Listed uses include mainsheet systems and spinnaker sheets on dinghies, off-the-beach catamarans and sportsboats up to 8m (26ft); halyard, vang and backstay duties on boats up to 9m (30ft); and control lines on larger yachts.