Ronstan Series 40 Ball Bearing Single Orbit Block with Becket & Cleat - RF45130

Lightweight

• Kilogram for kilogram of working load, BB and RT Orbit Blocks™ are the world's lightest
• The unique orbital design allows the bearing to only be in the active areas of the floating sheave
• This minimizes the mass of the inactive return race and hub
• Weight and bulk are further reduced in the different block configurations
• The ball bearing single and becket block has a through-sheave becket arrangement
• Multi-sheave blocks have only single intermediate cheeks and an ultra-light and efficient head arrangement
• This gives a 30% weight saving advantage over the nearest competitor
• Other brands just link together their single blocks
• This results in unnecessary double cheeks between each sheave, held together by a heavy steel channel across the top of the block

Highest Working Load In It's Class

• The orbital ball-bearing arrangement gives the largest possible bearing race diameter, maximizing load performance
• The proven Ronstan 2-stage bearing system features high compression grade acetal ball bearings and a secondary full-contact bearing, giving minimum friction across the full working load range
• The floating sheave and bearing system is supported by a fiber-reinforced load frame
• The design was computer modeled to be stress optimized

Features:

• Ultra Lightweight
• Low friction 2-stage Orbital ball bearing system
• Highest working load in its class
• Low profile and compact
• High performance cleating

Specifications:

• Type of Block: Single
• Breaking Load: 1433.0 lbs (650 kg)
• Maximum Working Load: 551.2 lbs (250 kg)
• Maximum Rope Diameter: 0.35" (9 mm)
• Weight: 3.70 oz (105 g)
• Pin Diameter: 0.16" (4 mm)
• Applications:
  • Mainsheet systems on spinnaker sheet on dinghies to 5 m (16')
  • Spinnaker sheets on dinghies, sports boats and small keel boats to 5 m (16')
  • Halyard, vang and backstay applications on boats to 26' (8 m)
  • Control line applications on larger yachts
• Materials:
  • Ball Bearings - High compression strength carbon black Acetal
  • Stage 2 Bearing - Glass fibre reinforced, MoS2 impregnated Nylon
  • Frame/Cheeks - Toughened, glass fibre reinforced Nylon
  • Sheave - Carbon fiber reinforced, PTFE impregnated Nylon

Note: Suitable for 3:1 system at rated block load. Line load through cleat not to exceed 125 kg (275 lbs).