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Special order from Ronstan — Estimated 2–4 weeks.
Description
Series 20 Ball Bearing Block - Upright Lead
Features:
Applications:
Materials:
Specifications:
Sheave Ø: 20mm(3/4")
Max. Rope Ø: 6mm(1/4")
Fastener Ø: 4mm(5/32")
M.W.L.: 250kg(550lbs)
B. L.: 550kg(1,210lbs)
Weight: 18g(0.6oz)
Features:
- 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 stainless steel or Torlon® ball bearings provide high performance & low friction
Applications:
- Typically used for halyards at the mast base
Materials:
- U.V. Stabilized Acetal sheaves
- Stainless steel ball bearings & Load housing
Specifications:
Sheave Ø: 20mm(3/4")
Max. Rope Ø: 6mm(1/4")
Fastener Ø: 4mm(5/32")
M.W.L.: 250kg(550lbs)
B. L.: 550kg(1,210lbs)
Weight: 18g(0.6oz)
Accessories
No accessories listed for this product.
Specifications
| SKU | RF20171 |
| UPC | 9316800255597 |
| Brand | Ronstan |
| Category | Sailing |
| Country of Origin | ID |
| Weight | 0.1 |
| Dimensions | 3 x 2 x 1 |
| Status | Active |
| Last Synced | 10/9/2026, 2:06:48 AM |
Compliance & Shipping
Returnable
Product Literature
No literature or manuals available for this product.
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Frequently Bought Together
Compare Key Features
| Feature |  Ronstan Series 20 Ball Bearing Block - Upright Lead CURRENT |  Ronstan Series 30 Ball Bearing Orbit Block - Triple - Becket |  Harken 57mm Carbo Air Block w/Swivel |  Barton Marine Ratchet Block - 55mm |  Harken 40mm Carbo Block 90° Fixed Head |
|---|---|---|---|---|---|
| Price | $24.08 | $57.81 | $53.93 | $111.66 | $41.35 |
| Brand | Ronstan | Ronstan | Harken | Barton Marine | Harken |
| Condition | New | New | New | New | New |
| Availability | Out of Stock | In Stock | In Stock | In Stock | In Stock |
| Weight | 0.1 | 0.19 | 0.3 | 0.3 | 0.11 |
| Dimensions | 3 x 2 x 1 | 4 x 2 x 2 | 6 x 3 x 1 | 6 x 3 x 2 | 5 x 3 x 1 |
| SKU | RF20171 | RF35312 | 2600 | 90500 | 2659 |
| Country | ID | INDONESIA | UNITED STATES | — | UNITED STATES |
| View Item | View Item | View Item | View Item | View Item |
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Frequently Asked Questions
Price
$24.08