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125mm Aluminum Loop Block

Part No. 3255

Sheave Ø (mm) 125 mm

Sheave Ø (in) 4 15/16 in

Maximum line Ø (mm) 19 mm

Maximum line Ø (in) 3/4 in

Maximum working load (kg) 4990 kg

Maximum working load (lb) 11000 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. The sheave center carries primary load, allowing a smaller, lighter weight block. The soft-attachment Loop block has a removable deadend post for attachment to a padeye. Lashings can also be used. Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.
Sheave Ø (mm)125 mm
Sheave Ø (in)4 15/16 in
Length (mm)163 mm
Length (in)6 in
Width (mm)127 mm
Width (in)5 in
Weight (g)674 g
Weight (oz)23.78 oz
Maximum line Ø (mm)19 mm
Maximum line Ø (in)3/4 in
Maximum working load (kg)4990 kg
Maximum working load (lb)11000 lb
Breaking load (kg)9979 kg
Breaking load (lb)22000 lb
Composer Export145362BOM IDDescriptionQty1AL-3769 ALPHA CHEEK12AL-3770 BETA CHEEK13H-34392B SHEAVE ASSM.14H-43816 AL-3515 DEAD END POST15HBB88 ROLLER CAGE ASSM.16HFS1275 FST. 8 X 1.25 X 16MM SHCS1tooltip
ID BOM Qty Price
H-34392B 1 more info

Sheave Assembly - 125 mm Black Magic Block

Sheaves are Hard Lube-anodized for maximum UV protection and a smooth surface. Captive Delrin ball bearings carry side loads.

AL-3769 1 more info $310.30
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Sideplate with Helicoil - 125 mm Black Magic Loop Block

Sideplates are Hard Lube-anodized for maximum UV protection and a smooth surface.

AL-3770 1 more info $310.30
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Sideplate with Isolator - 125 mm Black Magic Loop Block

Sideplates are Hard Lube-anodized for maximum UV protection and a smooth surface. Dissimilar metals are isolated to prevent corrosion.

HBB88ASSY 1 more info

Roller Cage Assembly - 125 mm Black Magic Block

Center cage keeps Torlon® roller bearings separated and parallel to reduce friction.

HFS1275 1 more info $2.00
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Fastener - M8 x 1.25 x 16 mm Socket Head Cap Screw, Black

Fasten with M8 hex wrench.

F R E E   G R O U N D  S H I P P I N G

for orders over $100!

Valid on orders shipping within the United States

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