TABLE
38
MINIMUM BREAKING FORCE
OF
WIRE
ROPE
Compacted
Strand
Wire
Rope
19
Strand
Rotation Resistant Classification/Bright
(Uncoated)
Nominal
Approximate
Minimum Breaking Force*
Diameter
Mass tons metric tonnes
High High
inches
mm
Ih/ft
kg/m
Standard Standard Standard
Standard
3/8
9.5
.31
.46
7.55 8.3 6.85 7.53
7/16 11.1 .40
.59 10.2
11.2
9.25
10.2
112
12.7 .54
.80 13.3 14.6 12.1 13.2
9/16
14.3 .69 1.03
16.8
18.5 15.2 16.8
5/8 15.9
.85 1.26 20.6 22.7
18.7 20.6
3/4
19.1 1.25 1.86 29.4 32.4 26.7 29.4
7/8
22.2
1.68 2.50 39.8
43.8
36.1
39.7
1 25.4 2.17
3.23 51.7 56.9 46.9 51.6
1-1/8
28.6 2.75 4.09 65.0 71.5
59.0
64.9
1-114
31.8 3.45 5.13 79.9 87.9 72.5
79.7
1-3/8
34.9 4.33
6.44
96.0 106.0
87.1
96.1
1-1/2
38.1 5.11
7.60 114.0
125.0
103.0
113.0
*
To convert to Kilonewtons (kN), multiply tons (minimum breaking force) by 8.896;
lib
= 4.448
newtons
(N).
The given strengths for rotation resistant ropes are applicable only when a test is conducted on
a new rope fixed at both ends. When the rope is in use, and one end is free to rotate, the nomi-
naJ
strength is reduced.
Wire Rope Technical Board - Wire Rope Users Manual, Fourth
Edition'
113
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