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Description
57mm Quad Block Swivel, Center Becket
Low-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to our popular Harken Big Boat blocks, these small, compact blocks have very high working loads for safe, easy trimming.
Features:
- Sheave Ø (mm) 57 mm
- Sheave Ø (in) 2 1/4 in
- Maximum line Ø (mm) 10 mm
- Maximum line Ø (in) 7/16 in
- Maximum working load (kg) 1080 kg
- Maximum working load (lb) 2380 lb
Accessories
No accessories listed for this product.
Specifications
| SKU | HSB380 |
| UPC | 097653132202 |
| Brand | Harken |
| Category | Sailing |
| Country of Origin | UNITED STATES |
| Weight | 0.75 |
| Dimensions | 5 x 4 x 3 |
| Status | Active |
| Last Synced | 8/26/2026, 2:05:37 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 |  Harken 57mm Quad Block Swivel, Center Becket CURRENT |  Ronstan Series 30 Ball Bearing Orbit Block™ - Cheek |  Ronstan Series 30 Ball Bearing Orbit Block - Triple - Becket |  Harken 40mm Carbo Block 90° Fixed Head |  Barton Marine Ratchet Block - 55mm |
|---|---|---|---|---|---|
| Price | $207.78 | $19.25 | $57.81 | $41.35 | $111.66 |
| Brand | Harken | Ronstan | Ronstan | Harken | Barton Marine |
| Condition | New | New | New | New | New |
| Availability | In Stock | In Stock | In Stock | In Stock | In Stock |
| Weight | 0.75 | 0.06 | 0.19 | 0.11 | 0.3 |
| Dimensions | 5 x 4 x 3 | 4 x 2 x 1 | 4 x 2 x 2 | 5 x 3 x 1 | 6 x 3 x 2 |
| SKU | HSB380 | RF35151 | RF35312 | 2659 | 90500 |
| Country | UNITED STATES | INDONESIA | INDONESIA | UNITED STATES | — |
| View Item | View Item | View Item | View Item | View Item |
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Frequently Asked Questions
Price
$207.78