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57 mm Aluminum Footblock 57 mm Aluminum Footblock 57 mm Aluminum Footblock
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57 mm Black Magic®

57 mm Aluminum Footblock

Part No. 3220
$170.30  Not available on-line. Please contact your Harken dealer.
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

The entire line of Black Magic® AirBlocks® has been redesigned with a sleek new look. Their unique, performance-packed engineering remains exactly the same.

Carrying some of the highest loads imposed by running rigging, these strong, lightweight blocks feature Torlon® roller bearings housed in a center cage. Rollers stay parallel for low-friction efficiency. Sculpted hardcoat-anodized aluminum sideplates protect sideload ball bearings. Dissimilar metals are isolated to minimize corrosion. Blocks are easily disassembled with a single hex wrench.

Either metric or imperial flathead fasteners may be used for mounting and are not exposed.

Sheave Ø (mm)57 mm
Sheave Ø (in)2 1/4 in
Length (mm)84 mm
Length (in)3 5/16 in
Height (mm)25 mm
Height (in)1 in
Weight (g)122 g
Weight (oz)4.29 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
Number of fasteners
Fasteners (mm)6 FH mm
Fasteners (in)1/4 FH in
A (mm)7 mm
A (in)9/32 in
B (mm)23 mm
B (in)7/8 in
C (mm)52 mm
C (in)2 1/32 in
D (mm)16 mm
D (in)5/8 in
E (mm)58 mm
E (in)2 9/32 in
F (mm)84 mm
F (in)3 5/16 in
G (mm)12 mm
G (in)15/32 in
DWG: 3220.DWG (open/save)
DXF: 3220.DXF (open/save)
IGS: 3220.IGS (open/save)
EPS: 3220.eps (open/save)
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