



Ronstan Series 40 Ball Bearing Block - Single Upright Lead - RF40171
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
Ronstan Series 40 Ball Bearing Block - Single Upright Lead - RF40171Series 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
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Your Ronstan Series 40 Ball Bearing Block - Single Upright Lead - RF40171 orders ship within 1-2 business days.
Delivery Options:
- Standard: 3-7 business days
- Fast: 2-3 business days
- Express: 1-2 business days
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
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4.1 ★★★★★
Based on 103 reviews
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Product Reviews
★★★★★ 5
It works.
Item Package Quantity: 1
All as shown and performs well. Reasonable price.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 3, 2026
★★★★★ 5
Amazing product
Item Package Quantity: 1
Awesome product , fits perfect for Honda crv sport hybrid touring 2026 . Quality is amazing , looks like the original OEM part .
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 13, 2026
★★★★★ 5
Great starter!
Excellent! A year later and it is still going strong! It will probably outlast the truck.
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Reviewed in the United States on May 22, 2026
★★★★★ 5
I got exactly what I ordered!
It was the correct part as listed.
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Reviewed in the United States on April 30, 2026
★★★★★ 5
Starter
Great product
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Reviewed in the United States on April 2, 2026
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