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125 mm Aluminum Double Footblock 125 mm Aluminum Double Footblock 125 mm Aluminum Double Footblock
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125 mm Black Magic®

125 mm Aluminum Double Footblock

Part No. 3258
$1,426.65  Not available on-line. Please contact your Harken dealer.
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)3292 kg
Maximum working load (lb)7260 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)125 mm
Sheave Ø (in)4 15/16 in
Length (mm)176 mm
Length (in)6 15/16 in
Height (mm)71.5 mm
Height (in)2 13/16 in
Weight (g)1711 g
Weight (oz)60.35 oz
Maximum line Ø (mm)19 mm
Maximum line Ø (in)3/4 in
Maximum working load (kg)3292 kg
Maximum working load (lb)7260 lb
Breaking load (kg)6585 kg
Breaking load (lb)14520 lb
Number of fasteners
Fasteners (mm)12 FH mm
Fasteners (in)1/2 FH in
A (mm)14 mm
A (in)17/32 in
B (mm)50 mm
B (in)1 25/32 in
C (mm)113 mm
C (in)4 7/16 in
D (mm)35 mm
D (in)1 11/32 in
E (mm)125 mm
E (in)4 29/32 in
F (mm)176 mm
F (in)6 29/32 in
G (mm)23 mm
G (in)29/32 in
DWG: 3258.DWG (open/save)
DXF: 3258.DXF (open/save)
IGS: 3258.IGS (open/save)
EPS: 3258.eps (open/save)
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