$65.54$77.11per unit
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Special order from Ronstan — Estimated 2–4 weeks.
Description
Series 55 BB Ball Bearing Orbit Block - Upright Lead
Features:
- Ultra Lightweight
- Low friction 2-stage Orbital ball bearing system
- Highest working load in its class
- Low profile and compact
- High performance cleating
Specifications:
- Sheave: 2-5/32"
- Max Rope: 3/8"
- MWL: 1100lb
- BL: 2200lb
- Weight: 3.2oz
Accessories
No accessories listed for this product.
Specifications
| SKU | RF55171 |
| UPC | 9316800373499 |
| Brand | Ronstan |
| Category | Sailing |
| Country of Origin | — |
| Weight | 0.25 |
| Dimensions | 6 x 3 x 1 |
| Status | Active |
| Last Synced | 10/8/2026, 2:07:34 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 55 BB Ball Bearing Orbit 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 | $65.54 | $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 | 0.25 | 0.19 | 0.3 | 0.3 | 0.11 |
| Dimensions | 6 x 3 x 1 | 4 x 2 x 2 | 6 x 3 x 1 | 6 x 3 x 2 | 5 x 3 x 1 |
| SKU | RF55171 | RF35312 | 2600 | 90500 | 2659 |
| Country | — | INDONESIA | UNITED STATES | — | UNITED STATES |
| View Item | View Item | View Item | View Item | View Item |
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Frequently Asked Questions
Price
$65.54