$204.38$240.45per unit
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Special order from Harken — Estimated 2–4 weeks.
Description
45mm Aluminum Black Magic Air Block with Swivel
Black Magic Air blocks are a top favorite of Big Boat performance racers and cruisers. These lightweight, free-running, powerful performers are used for sail controls that see lots of action: mainsheet, runner, halyard, and spinnaker systems. A center cage keeps Torlon® roller bearings separated and parallel to reduce friction. Shackle blocks lock in two directions or swivel to keep the line from twisting. Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.
Specifications:
- Sheave Ø (mm): 45 mm
- Sheave Ø (in): 1-3/4 in
- Length (mm): 100 mm
- Length (in): 3-15/16 in
- Weight (g): 79 g
- Weight (oz): 2.79 oz
- Shackle pin Ø (mm): 5 mm
- Shackle pin Ø (in): 3/16 in
- Maximum line Ø (mm): 10 mm
- Maximum line Ø (in): 3/8 in
- Maximum working load (kg): 750 kg
- Maximum working load (lb): 1653 lb
- Breaking load (kg): 1500 kg
- Breaking load (lb): 3306 lb
Accessories
No accessories listed for this product.
Specifications
| SKU | 3391 |
| UPC | — |
| Brand | Harken |
| Category | Sailing |
| Country of Origin | UNITED STATES |
| Weight | — |
| Dimensions | — |
| Status | Active |
| Last Synced | 8/17/2026, 1:13:21 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 45mm Aluminum Black Magic Air Block w/Swivel 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 | $204.38 | $57.81 | $53.93 | $111.66 | $41.35 |
| Brand | Harken | Ronstan | Harken | Barton Marine | Harken |
| Condition | New | New | New | New | New |
| Availability | Out of Stock | In Stock | In Stock | In Stock | In Stock |
| Weight | — | 0.19 | 0.3 | 0.3 | 0.11 |
| Dimensions | — | 4 x 2 x 2 | 6 x 3 x 1 | 6 x 3 x 2 | 5 x 3 x 1 |
| SKU | 3391 | RF35312 | 2600 | 90500 | 2659 |
| Country | UNITED STATES | INDONESIA | UNITED STATES | — | UNITED STATES |
| View Item | View Item | View Item | View Item | View Item |
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Price
$204.38