Ronstan Series 40 Ball Bearing Single Stand-Up Swivel Orbit Block, RF45140

The Ronstan Series 40 Orbit Block features a lightweight, high-performance design ideal for various rigging applications. This single block includes a stand-up swivel shackle head for unlimited rotation, constructed from grade 316 stainless steel for increased durability.

• Low-friction 2-stage orbital ball bearing system with acetal and nylon components
• Fiber-reinforced load frame for optimal stress distribution
• Compact, low-profile architecture
• Compatible with 2 x 4mm (5/32 in.) countersunk head screws for mounting
• Suitable for mainsheet systems on dinghies up to 5m (16ft)
• Recommended for spinnaker sheets on dinghies, sportsboats, and small keel boats up to 5m (16ft)
• Ideal for halyard, vang, and backstay use on boats up to 8m (26ft)
• Effective for control line applications on larger yachts

Materials:
Ball bearings are made of high-compression carbon black acetal, while the stage 2 bearing uses glass fiber reinforced, MoS2 impregnated nylon. The frame and cheeks are constructed from toughened, glass fiber reinforced nylon, and the sheave is carbon fiber reinforced with PTFE impregnated nylon.