50 mm Roller Bearing Blocks (RBB 50)

The RBB 50 is the smallest block in Seldén's roller bearing range — a 50 mm sheave rated to 750 kg safe working load, built for the loads that come and go rather than the ones that sit still. Where a ball bearing block starts to feel notchy under a loaded spinnaker sheet, the RBB 50 keeps turning, so the trimmer feels the sail and not the hardware.

• Designed for dynamic applications
• Machined, black anodized aluminum cheeks and acetal roller bearings
• Acetal ball bearings stabilize the sheave under side loads
• PA washer insulates stainless from aluminum to prevent corrosion
• D-shackle with Ø 5 mm body and pin
• Safe working load 750 kg · breaking load 1,500 kg · max line 10 mm