HARKEN 57 BLACK MAGIC DOUBLE FOOT BLOCK
Old style black magic blocks available only while stocks last.
Use footblocks to redirect lines on the deck. Footblocks with lockoffs temporarily secure sheets.
Either metric or imperial flathead fasteners may be used for mounting and are not exposed.
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)
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
4
Fasteners (mm)
6 FH mm
Fasteners (in)
1/4 FH in
A (mm)
9.5 mm
A (in)
3/8 in
B (mm)
22.5 mm
B (in)
29/32 in
C (mm)
51.5 mm
C (in)
2 1/32 in
D (mm)
16 mm
D (in)
5/8 in
E (mm)
59 mm
E (in)
2 5/16 in
F (mm)
84 mm
F (in)
3 5/16 in
G (mm)
13 mm
G (in)
1/2 in