U.S. Customers: Orders shipped from Canada may be subject to U.S. import duties, taxes, and/or tariffs as assessed by U.S. Customs and your carrier. These charges are not included in our product prices or shipping rates. You are responsible for any duties/tariffs/fees due on delivery or prior to delivery.
Canadian Based. Customer Focused.

Premium Marine Quality Parts

Harken
3391

Harken 45mm Aluminum Black Magic Air Block w/Swivel

LSN 103512 MPN 3391 MFR Harken
Special Order
BC, Warehouse

"Special Order" items will take longer to process and ship then "Express" items.
Typically takes no more then 14 days for delivery.

For next day parts. Visit our express parts catalog Here.
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$294.61
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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
Northern Marine Canada
Proudly Canadian Owned & Operated!
Serving customers across Canada & the USA with marine parts and accessories.
Canadian Head Office:
Kingston, Ontario, Canada
Warehouse Locations:
Toronto, Ontario, Canada
New Jersey, USA
Florida, USA

About Us

Northern Marine is a Canadian supplier of premium marine and RV parts and accessories from top industry brands. We focus on quality, accurate listings, and dependable fulfillment so you can maintain, repair, and outfit your boat or RV with confidence.

Our goal is simple: get you the right parts, shipped fast, with straightforward service you can count on.