![Ronstan Series 20 Ball Bearing Block- Single, Stand-Up Loop Top [RF20141]](https://www.boataccessorydepot.com/wp-content/uploads/2026/10/ronstan-series-20-ball-bearing-block-single-stand-up-loop-top-rf20141.webp)
Series 20 Ball Bearing Block- Single, Stand-Up Loop Top
Features:
- Low friction
- High static and dynamic load capacity
- Lightweight
Precision molded Acetal sheaves running on stainless steel or Torlon® ball bearings provide high performance & low friction.
Applications:
- Dinghy control lines
- Dinghy vangs
- Cunninghams
- Traveler 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 55 Ball Bearing Orbit Block - Single - Becket - Swivel Head [RF55110]](https://www.boataccessorydepot.com/wp-content/uploads/2026/10/ronstan-series-55-ball-bearing-orbit-block-single-becket-swivel-head-rf55110.webp)
![Ronstan Series 30 Ball Bearing Orbit Block - Triple - Becket [RF35312]](https://www.boataccessorydepot.com/wp-content/uploads/2026/10/ronstan-series-30-ball-bearing-orbit-block-triple-becket-rf35312.webp)
![Ronstan Series 20 Ball Bearing Orbit Block - Single - Dyneema Lashing - Becket Option [RF25109]](https://www.boataccessorydepot.com/wp-content/uploads/2026/10/ronstan-series-20-ball-bearing-orbit-block-single-dyneema-lashing-becket-option-.webp)
![Ronstan Series 30 Ball Bearing Orbit Block - Single - Becket - Swivel Shackle Head [RF35100]](https://www.boataccessorydepot.com/wp-content/uploads/2026/10/ronstan-series-30-ball-bearing-orbit-block-single-becket-swivel-shackle-head-rf3.webp)
![Ronstan Series 55 Ratchet Orbit Block - Single - Swivel Head - Auto & Manual [RF56100]](https://www.boataccessorydepot.com/wp-content/uploads/2026/10/ronstan-series-55-ratchet-orbit-block-single-swivel-head-auto-manual-rf56100.webp)
![Ronstan Series 40 All Purpose Block - Double Block - Full Swivel Head [RF41200]](https://www.boataccessorydepot.com/wp-content/uploads/2026/10/ronstan-series-40-all-purpose-block-double-block-full-swivel-head-rf41200.webp)
![Ronstan Series 50 All Purpose Block - Single - Universal Head [RF51100]](https://www.boataccessorydepot.com/wp-content/uploads/2026/10/ronstan-series-50-all-purpose-block-single-universal-head-rf51100.webp)
![Ronstan Series 20 Ball Bearing Block - Double - 2-Axis Shackle Head [RF20202]](https://www.boataccessorydepot.com/wp-content/uploads/2026/10/ronstan-series-20-ball-bearing-block-double-2-axis-shackle-head-rf20202.webp)
