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75mm Aluminum Block — Swivel

Part No. 3231

Sheave Ø (mm) 75 mm

Sheave Ø (in) 2 15/16 in

Maximum line Ø (mm) 14 mm

Maximum line Ø (in) 9/16 in

Maximum working load (kg) 2268 kg

Maximum working load (lb) 5000 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)75 mm
Sheave Ø (in)2 15/16 in
Length (mm)129 mm
Length (in)5 1/8 in
Weight (g)331 g
Weight (oz)11.68 oz
Shackle pin Ø (mm)8 mm
Shackle pin Ø (in)5/16 in
Maximum line Ø (mm)14 mm
Maximum line Ø (in)9/16 in
Maximum working load (kg)2268 kg
Maximum working load (lb)5000 lb
Breaking load (kg)4536 kg
Breaking load (lb)10000 lb
Composer Export26541093871BOM IDDescriptionQty12116 SHKL. 8MM D HR12AL-3728 ALPHA CHEEK13AL-3729 BETA CHEEK14H-34390A SHV. ASSM.15HBB86 ROLLER CAGE ASSM.16HFS788 FST. 5 X .8 X 10MM SHSS17HFS806 FST. 5 X .8 X 16MM SHCS38MP-3021 FST. ISOLATOR39MP-3033 HD. POST COLLAR210SP-067 HEAD POST1tooltip
ID BOM Qty Price
2116 1 more info $77.65
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8mm "D" Shackle — High Resistance

Forged stainless steel shackles are polished to a high luster and are stamped with the screw pin diameter. High-Resistance (HR) shackles are forged in 17-4PH stainless steel to handle high loads. They have an "HR" imprint for easy identification.

H-34390A 1 more info $38.50
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Sheave Assembly - 75mm Black Magic Block

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

SP-067 1 more info $37.45
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Headpost - 57/75mm Black Magic Block

Black Magic blocks have 17-4 PH stainless headposts.

MP-3033 2 more info $1.60
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Headpost Collar Half - 57/75mm Black Magic Block

Headpost collar isolates dissimilar metals to prevent corrosion. Collar accepts set screw that fixes shackle in one direction or allows it to swivel.

HBB86 1 more info $49.50
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Roller Cage Assembly - 75mm Black Magic Block

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

HFS806 3 more info $1.07
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Fastener - M5 x .8 x 16mm Socket Head Cap Screw, Black

Fasten with M5 hex wrench.

AL-3728 1 more info

Sideplate with Helicoils - 75mm Black Magic Block

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

AL-3729 1 more info $83.45
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Sideplate - 75mm Black Magic Block

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

MP-3021 3 more info $1.07
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Fastener Isolator - 5mm SK HD

Dissimilar metals are isolated to prevent corrosion.

HFS788 1 more info $1.65
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Fastener - M5 x 0.8 x 10mm Stainless Steel Socket Head Shoulder Screw Cup, Black

Set screw allows shackle to be fixed or to swivel.

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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