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Harken, Inc.
Harken 57mm Double Black Magic Aluminum Low-Load Block with Swivel - 3228
Harken 57mm Double Black Magic Aluminum Low-Load Block with Swivel - 3228
57mm Swivel Double Roller Bearing Pulley (Low-Load)
SKU:H3228
MSRP
Regular price
$419.95 USD
Regular price
MSRP:$476.65 USD
Sale price
$419.95 USD
Unit price
/
per
Shipping calculated at checkout.
- Quantities are subject to availability. We will confirm stock before processing your order. If an item is unavailable, we may suggest a substitute or drop ship the product to you. You are welcome to cancel at no charge if substitution/drop shipping does not suit your needs.
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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 line from twisting. Low-load blocks have red isolators. They use Torlon rollers and 316 stainless steel shackles. Standard blocks have 17-4 PH stainless headposts. Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.
The Black Magic Double Pulley construction offers an optimal strength to weight ratio. Easy maintenance as the there is a hex screw disassembly and all bearings remain captive. The swivel post can fully rotate or be locked in two directions
Sheave ⌀ : 2-1/4”
(57 mm)
Weight: 12 oz (342 g)
Max Line ⌀ : 7/16” (12 mm)
Max Working Load: 2755 lbs (1250 kgs)
Breaking Load: 5510 lbs (2500 kgs)
Shackle Pin ⌀ : 5/16” (8 mm)
Weight: 12 oz (342 g)
Max Line ⌀ : 7/16” (12 mm)
Max Working Load: 2755 lbs (1250 kgs)
Breaking Load: 5510 lbs (2500 kgs)
Shackle Pin ⌀ : 5/16” (8 mm)
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