Harken 57mm Aluminum Low Load Black Magic Block w/Swivel

57mm Aluminum Low Load Black Magic 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. Low-load blocks have red isolators. They use Torlon® rollers and 316 stainless steel shackles. Standard blocks have 17-4 PH stainless head posts. Torlon is a registered trademark of Solvay Advanced Polymers L.L.C. 

Specifications:

• Sheave: 57mm/2-1/4in
• Length: 119mm/4-11/16in
• Weight: 154g/5.44oz
• Shackle Pin: 6mm/1/4in
• Maximum Line: 12mm / 7/16in
• Maximum Working Load: 7/16kg / 1655lbs
• Breaking Load: 1500kg / 3300lb

Orders of physical products placed by 3 PM EST M-F typically ships the same day, if all requested items are in stock. Weekend orders will typically ship on Monday.

Shipping takes 2-7 days.

We currently ship to the Contiguous 48 States.

Life of Sailing merch is custom made for the customer after an order is placed. Total turnaround is typically 7-14 days from order to doorstep.