![Ronstan Series 40 Ball Bearing Block - Double - Swivel Head [RF40200]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/1280x1280/products/27972/36292/70616XL__76230.1646191251.jpg?c=1 "Ronstan Series 40 Ball Bearing Block - Double - Swivel Head [RF40200]")
![Ronstan Series 40 Ball Bearing Block - Double - Swivel Head [RF40200]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/27972/36292/70616XL__76230.1646191251.jpg?c=1 "Ronstan Series 40 Ball Bearing Block - Double - Swivel Head [RF40200]")
Series 40 Ball Bearing Block - Double - Swivel Head
Features:
- Low friction Acetal or Torlon® bearing system
- Lightweight
- Cheek cut-outs for easy bearing maintenance
- Features a swivel shackle head for full 360° rotation
Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction. The 2-stage ball bearing system provides consistent performance over the full load range.
Applications:
- Mainsheet
- Halyard
- Vang
- Spinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8m (26ft)
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![Ronstan Series 40 Ball Bearing Block - Single - Universal Head [RF40100]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/27462/35491/55210XL__38404.1646182462.jpg?c=1 "Ronstan Series 40 Ball Bearing Block - Single - Universal Head [RF40100]")
![Ronstan Series 15 Ball Bearing Utility Block - Double, Loop Head [RF15202]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/28010/36331/71027XL__28552.1646191537.jpg?c=1 "Ronstan Series 15 Ball Bearing Utility Block - Double, Loop Head [RF15202]")
![Ronstan Series 30 Utility Ball Bearing Block - Single, Swivel Shackle Head [RF30100]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/28090/36446/72397XL__67793.1646192406.jpg?c=1 "Ronstan Series 30 Utility Ball Bearing Block - Single, Swivel Shackle Head [RF30100]")
![Ronstan Series 55 Ball Bearing Orbit Block - Single - Becket - Swivel Head [RF55110]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/27505/35534/55256XL__69344.1646182570.jpg?c=1 "Ronstan Series 55 Ball Bearing Orbit Block - Single - Becket - Swivel Head [RF55110]")
![Ronstan Series 20 Ball Bearing Block - Double - 2-Axis Shackle Head [RF20202]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/17564/21900/55139XL__27181.1638826582.jpg?c=1 "Ronstan Series 20 Ball Bearing Block - Double - 2-Axis Shackle Head [RF20202]")
![Ronstan Series 40 Ball Bearing Orbit Block - Cheek [RF45151]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/27979/36299/70626XL__69487.1646191273.jpg?c=1 "Ronstan Series 40 Ball Bearing Orbit Block - Cheek [RF45151]")