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MEASURING DIAMETERS
OF WIRE ROPE 

REEL CAPACITY
CALCULATION 
The following formula is a
genereal guide to establish the approximate length of rope that will fit onto a
reel or drum. This formula is based on a uniform wind with the same quantity of
wraps per layer. 

The formula is : (A + D) x A x B
x K = L
A = Depth of outside edge of the flange to
the drum B = Width of drum between flanges D = Drum Diameter K = The
constant for the rope diameter (see table below) L = The length of rope in
feet 
The formula below uses the following reel and wire
dimensions. A
= 10",B = 20",D = 18", the wire rope diameter is 1/2" so K =
0.925 
would be
calculated as follows (10 + 18) x 10 x 20 x 0.925 = 5,180 ft.

Wire Dia.
in Inches 
K 
Wire Dia.
in Inches 
K 
Wire Dia.
in Inches 
K 
1/16 
49.8 
1/2 
0.925 
1
3/8 
0.12 
3/32 
23.4 
9/16 
0.741 
1
1/2 
0.10 
1/8 
13.6 
5/8 
0.607 
1
5/8 
0.08 
5/32 
8.72 
11/16 
0.506 
1
3/4 
0.07 
3/16 
6.14 
3/4 
0.428 
1
7/8 
0.06 
7/32 
4.59 
13/16 
0.354 
2 
0.05 
1/4 
3.29 
7/8 
0.308 
2
1/8 
0.05 
5/16 
2.21 
1 
0.239 
2
1/4 
0.04 
3/8 
1.58 
1
1/8 
0.191 
2
3/8 
0.04 
7/16 
1.19 
1
1/4 
0.152 
2
1/2 
0.03 
