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125mm Aluminum Block — Swivel

Part No. 3256

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. 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)125 mm
Sheave Ø (in)4 15/16 in
Length (mm)254 mm
Length (in)10 in
Width (mm)127.5 mm
Width (in)5 in
Weight (g)1058 g
Weight (oz)37.31 oz
Shackle pin Ø (mm)12 mm
Shackle pin Ø (in)1/2 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
Breaking load (kg)9979 kg
Breaking load (lb)22000 lb
Composer Export265493871BOM IDDescriptionQty12127 SHKL. 12MM D HR12AL-3771 ALPHA CHEEK13AL-3772 BETA CHEEK14H-34392B SHEAVE ASSM.15HBB88 ROLLER CAGE ASSM.16HFS1272 FST. 6 X 1 X 10 MM SHSS17HFS1275 FST. 8 X 1.25 X 16MM SHCS38MP-3037 HEAD POST COLLAR29SP-073 HEAD POST1tooltip
ID BOM Qty Price
2127 1 more info $185.30
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12mm "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-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.

SP-073 1 more info $90.95
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Headpost - 100/125 mm Black Magic Block

Black Magic blocks have 17-4 PH stainless headposts.

HFS1272 1 more info

Fastener - M6 1 x 10mm Socket Head Shoulder Screw Cup, Black

Set screw allows shackle to be fixed or to swivel.

MP-3037 2 more info $1.65
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Headpost Collar Half - 100/125 mm 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.

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 3 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.

AL-3771 1 more info $192.60
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Sideplate with Helicoils - 125 mm Black Magic Block

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

AL-3772 1 more info $192.60
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Sideplate with Isolators - 125 mm Black Magic Block

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

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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