Description
Ronstan Series 40 Ball Bearing Block – Single Upright Lead – Marine Boat Replacement Part is organized for anchoring, docking & mooring shoppers who need a clear, professional marine parts buying experience.
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
Fitment & Product Details
- Brand / Manufacturer: Ronstan
- Material: stainless steel
- Search-optimized by brand, system, part type, and fitment cues.
- Verify compatibility with your original part number, engine model, and application before ordering.
- Built for boat owners, e-commerce shoppers, and professional marine service teams.






Reviews
There are no reviews yet.