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Ronstan "Orbit" Ball Bearing Block - 40mm - Single / Becket / Swivel Head

Ronstan "Orbit" Ball Bearing Block - 40mm - Single / Becket / Swivel Head

SKU: 504822

$30.56 / EA

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Orbit™ Ball Bearing Block - 40mm

Series 40 BB

Kilogram for kilogram of working load, Ball Bearing Orbit Blocks™ are the world's lightest. The unique orbital design allows the bearing to be only in the active areas of the floating sheave. Weight and bulk are further reduced in the different block configurations. The ball bearing single with becket blocks have a through-sheave becket arrangement. The result is the lowest weight possible.

Block RF45110 features a stainless steel, swivel shackle head for unlimited block rotation and ultimate durability. It also has an ultra-low-profile integrated becket.


  • Ultra lightweight
  • Low friction 2-stage Orbital ball bearing system
  • Highest working load in its class
  • Low profile and compact
  • High-performance cleating
  • Stainless steel swivel shackle head


  • 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 fibre reinforced, PTFE-impregnated Nylon


  • Mainsheet systems on dinghies to 16 ft. (5m)
  • Spinnaker sheets on dinghies, sport boats & small keelboats to 16 ft. (5m)
  • Halyard, vang & backstay applications on boats to 26 ft. (8m)
  • Control line applications on larger yachts


  • Sheave Diameter - 1-9/16" (40mm)
  • Max Rope Diameter - 5/16" (9mm)

Mfg No. RF45110

Description Single / becket / swivel head

Max Working Load 715 Lbs (325kg)

Breaking Load 1,430 Lbs (650kg)

Weight 1.6 oz. (44g)

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