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100mm Aluminum Block — Swivel, Becket

100mm Aluminum Block — Swivel, Becket

Part No. 3247

Sheave Ø (mm) 100 mm

Sheave Ø (in) 3 15/16 in

Maximum line Ø (mm) 16 mm

Maximum line Ø (in) 5/8 in

Maximum working load (kg) 3402 kg

Maximum working load (lb) 7500 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)100 mm
Sheave Ø (in)3 15/16 in
Length (mm)241 mm
Length (in)9 1/2 in
Weight (g)675 g
Weight (oz)23.82 oz
Shackle pin Ø (mm)10 mm
Shackle pin Ø (in)3/8 in
Maximum line Ø (mm)16 mm
Maximum line Ø (in)5/8 in
Maximum working load (kg)3402 kg
Maximum working load (lb)7500 lb
Breaking load (kg)6804 kg
Breaking load (lb)15000 lb
Composer Export42865310971BOM IDDescriptionQty12123 SHKL. 10MM D HR12AL-3755 ALPHA CHEEK13AL-3756 BETA CHEEK14AL-3792 BECKET15H-34391A SHEAVE ASSM.16HBB87 ROLLER CAGE ASSM.17HFS1271 FST. 6 X 1 X 16MM SHCS48HFS1272 FST. 6 X 1 X 10MM SHSS19MP-3035 HD. POST COLLAR210SP-072 HEAD POST1tooltip
ID BOM Qty Price
2123 1 more info $119.60
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10mm "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.

SP-072 1 more info $56.00
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Headpost - 75/100mm Black Magic Block

Black Magic blocks have 17-4 PH stainless headposts.

MP-3035 2 more info $1.55
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Headpost Collar Half - 75/100mm 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.

HBB87ASSY 1 more info

Roller Cage Assembly - 100 mm Black Magic Block

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

HFS1271 4 more info $0.50
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Fastener - M6 x 1 x 16 mm Socket Head Cap Screw, Black

Fasten with M6 hex wrench.

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.

AL-3755 1 more info

Sideplate with Helicoils - 100 mm Black Magic Block, Becket

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

AL-3756 1 more info

Sideplate with Isolators - 100 mm Black Magic Block, Becket

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

AL-3792 1 more info

Becket Spacer - 100 mm Black Magic Block, Becket

Use the becket to deadend line.

H-34391A 1 more info $76.00
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Sheave Assembly - 100 mm Black Magic Block

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