![Ronstan Series 40 Ball Bearing Block - Single Upright Lead [RF40171]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/1280x1280/products/27971/36291/70615XL__34111.1646191248.jpg?c=1 "Ronstan Series 40 Ball Bearing Block - Single Upright Lead [RF40171]")
![Ronstan Series 40 Ball Bearing Block - Single Upright Lead [RF40171]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/27971/36291/70615XL__34111.1646191248.jpg?c=1 "Ronstan Series 40 Ball Bearing Block - Single Upright Lead [RF40171]")
Series 40 Ball Bearing Block - Single Upright Lead
Lead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers. Precision molded Acetal 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:
- Typically used for halyards at the mast base.
Materials:
- Acetal ball bearings
- UV stabilized Acetal sheave
- Grade 316 stainless steel load housing
![Ronstan Series 40 Ball Bearing Orbit Block - Single - Becket - Swivel Head [RF45110]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/27470/35499/55218XL__18541.1646182485.jpg?c=1 "Ronstan Series 40 Ball Bearing Orbit Block - Single - Becket - Swivel Head [RF45110]")