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57mm Aluminum Stand-up Block

Part No. 3227

Sheave Ø (mm) 57 mm

Sheave Ø (in) 2 1/4 in

Maximum line Ø (mm) 12 mm

Maximum line Ø (in) 7/16 in

Maximum working load (kg) 1134 kg

Maximum working load (lb) 2500 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. Sideplates and sheaves Hard Lube-anodized for maximum UV protection and a smooth surface. Center cage keeps Torlon® roller bearings separated and parallel to reduce friction. Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.
Sheave Ø (mm)57 mm
Sheave Ø (in)2 1/4 in
Length (mm)114 mm
Length (in)4 1/2 in
Weight (g)200 g
Weight (oz)7.04 oz
Maximum line Ø (mm)12 mm
Maximum line Ø (in)7/16 in
Maximum working load (kg)1134 kg
Maximum working load (lb)2500 lb
Breaking load (kg)2268 kg
Breaking load (lb)5000 lb
Fasteners (mm)6 mm
Fasteners (in)1/4 in
Fastener circle (mm)37 mm
Fastener circle (in)1 15/32 in
A (mm)57 mm
A (in)2 7/32 in
B (mm)56 mm
B (in)2 3/16 in
C (mm)32 mm
C (in)1 1/4 in
IncludesPadeye
Composer Export68101943527BOM IDDescriptionQty1AL-3702 ALPHA CHEEK12AL-3703 BETA CHEEK13H-34389A SHV. ASSM.14HBB85 ROLLER CAGE ASSM.15HFS796 FST. 4 X .7 X 12MM SHCS36HFS798 FST. 4 X .7 X 8MM SHsS17MP-3020 FST. ISOLATOR38MP-3030 HD. POST CLR.29MP-3040 STANDUP DEVISE110MS-1965 PADEYE ASSM.1tooltip
ID BOM Qty Price
HFS796 3 more info $0.30
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Fastener - M4 x .7 x 12mm Socket Head Cap Screw, Black

Fasten with M4 hex wrench.

MP-3020 3 more info $1.00
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Fastener Isolator - 4mm SK HD

Dissimilar metals are isolated to prevent corrosion.

HFS798 1 more info $0.35
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Fastener - M4 0.7 x 8mm Stainless Steel Socket Head Shoulder Screw Cup, Black

Set screw allows shackle to be fixed or to swivel.

MS-1965 1 more info $95.00
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Padeye Assembly with Head Post - 57mm Black Magic Block

316 stainless steel padeye base. Use 6 mm (1/4") fasteners.

MP-3030 2 more info $1.50
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Headpost Collar Half - 57mm Black Magic Single Block

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

AL-3702 1 more info $54.00
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Sideplate with Helicoils - 57mm Black Magic Block

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

AL-3703 1 more info $54.00
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Sideplate - 57mm Black Magic Block

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

HBB85 1 more info $28.00
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Roller Cage Assembly - 57mm Black Magic Block

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

H-34389A 1 more info $26.21
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Sheave Assembly - 57mm Black Magic Block

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

MP-3040 1 more info $14.25
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Stand-up Base - 57mm Black Magic Block

Made of durable, flexible rubber, the stand-up boot holds block upright without snagging lines.