![Ronstan Series 20 Ball Bearing Block - Single, Loop Mount [RF20184]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/ronstan-series-20-ball-bearing-block-single-loop-mount-rf20184.webp)
Series 20 Ball Bearing Block – Single, Loop Mount
Features:
- Low friction
- High static and dynamic load capacity
- Lightweight
- Single point mounting
Precision molded Acetal sheaves running on stainless steel or Torlon® ball bearings provide high performance & low friction.
Applications:
- Dinghy control lines
- Dinghy vangs
- Cunninghams
- Traveller controls
Materials:
- Stainless steel ball bearings
- UV stabilized Acetal sheave
- Grade 316 stainless steel load strap and head fitting
- Impact and UV resistant, fiber reinforced Nylon cheeks
![Ronstan Series 20 Ball Bearing Block - Single - Loop Top [RF20101]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/ronstan-series-20-ball-bearing-block-single-loop-top-rf20101.webp)
![Ronstan Series 20 Ball Bearing Block - Double - Becket - 2-Axis Shackle Head [RF20212]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/ronstan-series-20-ball-bearing-block-double-becket-2-axis-shackle-head-rf20212.webp)
![Ronstan Race Sheave - Rope/Wire - Nylatron - 25mm (1") OD [RF131]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/ronstan-race-sheave-rope-wire-nylatron-25mm-1-od-rf131.webp)
![Ronstan Wire Block w/Removable Clevis Pin Head - Nylatron Sheave - 25mm (1") Sheave Diameter [RF418C]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/ronstan-wire-block-w-removable-clevis-pin-head-nylatron-sheave-25mm-1-sheave-dia.webp)
![Ronstan Series 30 Fiddle Block - Narrow w/Tube Rivet HeadV-Jam Cleat [RF187]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/ronstan-series-30-fiddle-block-narrow-w-tube-rivet-headv-jam-cleat-rf187.webp)
![Ronstan Series 20 Ball Bearing Block - Single - Cheek [RF20151]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/ronstan-series-20-ball-bearing-block-single-cheek-rf20151.webp)
![Ronstan Series 40 AP Sheave - Acetal Solid Bearing - 40mm (1-9/16")OD [RF41000]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/ronstan-series-40-ap-sheave-acetal-solid-bearing-40mm-1-9-16-od-rf41000.webp)
![Ronstan Race Sheave - Acetal Solid Bearing - 66mm (2-5/8") OD [RF1765]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/ronstan-race-sheave-acetal-solid-bearing-66mm-2-5-8-od-rf1765.webp)
![C.E. Smith Black 40" Post Guide-On [27626]](https://www.yachtseatworks.com/wp-content/uploads/2026/10/c-e-smith-black-40-post-guide-on-27626.webp)
