Ronstan Series 40 Orbit BB Double Block w/Becket & Swivel Shackle

For sailors setting up mainsheet, spinnaker sheet or control-line systems, the Ronstan Series 40 Orbit BB double block combines two sheaves with a becket and swivel shackle. Its two-stage bearing arrangement reduces friction while trimming and maintains low friction across the working load range.

Key features

• Ball bearings handle friction reduction, with a secondary full-contact bearing supporting operation across the working load range.
• Toughened glass fiber reinforced nylon cheeks provide strength without the weight of traditional stainless steel straps.
• A compact, low-profile body keeps the block assembly small.
• The double-sheave configuration includes a becket and swivel shackle for rigging your system.

Specifications

• Series: 40 Orbit BB
• Configuration: Double block with becket and swivel shackle
• Cheek material: Toughened glass fiber reinforced nylon
• 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: 4.6 oz.

Good to know

Listed applications include mainsheet and spinnaker sheet systems on dinghies, off-the-beach catamarans and sportsboats up to 8 m (26 ft), plus halyard, vang and backstay systems on boats up to 9 m (30 ft). Control-line use on larger yachts is also listed.