![Ronstan Series 40 Ball Bearing Block - Double - Swivel Head [RF40200]](https://cdn11.bigcommerce.com/s-tzjarqqxnb/images/stencil/1280x1280/products/10706/12835/70616XL__20248.1714538912.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-tzjarqqxnb/images/stencil/500x659/products/10706/12835/70616XL__20248.1714538912.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 Orbit Block - Single - Becket - Cleat - Swivel Head [RF45130]](https://cdn11.bigcommerce.com/s-tzjarqqxnb/images/stencil/500x659/products/10708/12837/70624XL__36368.1714538916.jpg?c=1 "Ronstan Series 40 Ball Bearing Orbit Block - Single - Becket - Cleat - Swivel Head [RF45130]")
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![Ronstan Series 40 Ball Bearing Block - Single - Universal Head [RF40100]](https://cdn11.bigcommerce.com/s-tzjarqqxnb/images/stencil/500x659/products/6271/7768/55210XL__90212.1714528778.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-tzjarqqxnb/images/stencil/500x659/products/10862/13015/71027XL__47391.1714539267.jpg?c=1 "Ronstan Series 15 Ball Bearing Utility Block - Double, Loop Head [RF15202]")
![Ronstan Series 55 Ball Bearing Orbit Block - Single - Becket - Swivel Head [RF55110]](https://cdn11.bigcommerce.com/s-tzjarqqxnb/images/stencil/500x659/products/6286/7783/55256XL__60222.1714528814.jpg?c=1 "Ronstan Series 55 Ball Bearing Orbit Block - Single - Becket - Swivel Head [RF55110]")
![Ronstan Series 30 Utility Ball Bearing Block - Single, Swivel Shackle Head [RF30100]](https://cdn11.bigcommerce.com/s-tzjarqqxnb/images/stencil/500x659/products/11331/13583/72397XL__42658.1714540456.jpg?c=1 "Ronstan Series 30 Utility Ball Bearing Block - Single, Swivel Shackle Head [RF30100]")
![Ronstan Series 20 Ball Bearing Block - Double - 2-Axis Shackle Head [RF20202]](https://cdn11.bigcommerce.com/s-tzjarqqxnb/images/stencil/500x659/products/6242/7739/55139XL__06526.1714528715.jpg?c=1 "Ronstan Series 20 Ball Bearing Block - Double - 2-Axis Shackle Head [RF20202]")
![Ronstan Series 30 Ball Bearing Orbit Block - Single - Becket - Swivel Shackle Head [RF35100]](https://cdn11.bigcommerce.com/s-tzjarqqxnb/images/stencil/500x659/products/6253/7750/55173XL__26061.1714528738.jpg?c=1 "Ronstan Series 30 Ball Bearing Orbit Block - Single - Becket - Swivel Shackle Head [RF35100]")