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150 mm Aluminum Block — Swivel 150 mm Aluminum Block — Swivel
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150 mm Black Magic

150 mm Aluminum Block — Swivel

Part No. C5121
$2,255.00$563.81 This limited quantity item sold out
Sheave Ø (mm)150 mm
Sheave Ø (in)5 15/16 in
Maximum line Ø (mm)25 mm
Maximum line Ø (in)1 in
Maximum working load (kg)8800 kg
Maximum working load (lb)19400 lb

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.

Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.

Sheave Ø (mm)150 mm
Sheave Ø (in)5 15/16 in
Weight (g)3033 g
Weight (oz)107 oz
Shackle pin Ø (mm)20 mm
Shackle pin Ø (in)25/32 in
Maximum line Ø (mm)25 mm
Maximum line Ø (in)1 in
Maximum working load (kg)8800 kg
Maximum working load (lb)19400 lb

DO NOT use Harken equipment for human suspension unless product is specifically certified and labeled for such use.

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