Ronstan Series 20 Ball Bearing Block - Single - Cheek Rivet Mount

The Ronstan Series 20 Ball Bearing Block – Single – Cheek Rivet Mount (RF20151A) is a precision-engineered pulley system designed for demanding marine, rigging, and tactical applications where smooth load transfer and durability are essential. This single-block configuration delivers reliable performance in environments requiring repeated mechanical stress, from sailboat rigging to equipment suspension systems. The cheek rivet mount design provides a secure, permanent installation method suitable for both screw and pop rivet fastening.

Built with precision-molded acetal sheaves running on stainless steel or Torlon bearing surfaces, this block minimizes friction while maintaining exceptional static and dynamic load capacity. The ball bearing construction enables smooth operation under heavy loads, reducing wear and extending service life in high-demand scenarios. At just 0.1 lbs and measuring 2 x 1 x 3 inches, the compact, lightweight design integrates easily into space-constrained installations without sacrificing strength or performance, making it ideal for weight-sensitive applications.

Users benefit most when working with rope systems, cargo handling, or mechanical advantage applications where friction reduction directly improves efficiency. The cheek rivet mount accommodates both permanent screw mounting and quick pop rivet installation, offering flexibility for field repairs or custom rigging setups. Professionals in marine, tactical, and industrial sectors rely on Ronstan Series 20 blocks for their proven durability, low-friction operation, and ability to handle sustained high loads without degradation.