Machinery's Handbook, 31st Edition
Wire Rope 2719 for diameter as well as for minimum breaking strength and maximum pitch are given in Federal Specification for Wire Rope, RR-R—571a. Wire Rope Strengths: The strength figures shown in the accompanying tables have been obtained by a mathematical derivation based on actual breakage tests of wire rope and represent from 80 to 95 percent of the total strengths of the individual wires, depending upon the type of rope construction. Table 7. Weights and Strengths of Standard Flat Wire Rope, Not Preformed
This rope consists of a number of 4-strand rope units placed side by side and stitched together with soft steel sewing wire.
Flat Wire Rope
Breaking Strength, Tons of 2000 Lbs.
Breaking Strength, Tons of 2000 Lbs.
Width and Thickness, Inches
Approx. Weight per Ft., Pounds
Width and Thickness, Inches
Approx. Weight per Ft., Pounds
No. of Ropes
Mild Plow Steel
No. of Ropes
Mild Plow Steel
Plow Steel
Plow Steel
9
3.16 3.82
81.8 71.2 90.9 79.1
7 9
0.69 0.88 1.15 1.34 0.77 1.05 1.33 1.61 1.89 2.17 1.25 1.64 1.84 2.23 2.44 2.83 3.03 3.42 3.63 2.13 2.47 2.82
16.8 14.6 21.7 18.8 26.5 23.0 31.3 27.2 18.5 16.0 25.8 22.4 33.2 28.8 40.5 35.3 47.9 41.7 55.3 48.1 31.4 27.3 41.8 36.4 47.1 40.9 57.5 50.0 62.7 54.6 73.2 63.7 78.4 68.2 88.9 77.3 94.1 81.9 54.5 47.4 63.6 55.4 72.7 63.3
1 ∕ 4 × 1 1 ∕ 2
1 ∕ 2 × 4
10 12 13 14 16
1 ∕ 4 × 2
1 ∕ 2 × 4 1 ∕ 2
4.16 109 4.50 118 4.85 127 5.85 145 3.95 100 4.50 114 5.04 129 5.59 143 3.40 6.14 157 7.23 186 8.32 214 6.50 165 7.31 185 8.13 206 9.70 227 7.50 190 8.56 217 9.63 244
94.9
11 13
1 ∕ 4 × 2 1 ∕ 2
1 ∕ 2 × 5
103 111 126
1 ∕ 4 × 3
1 ∕ 2 × 5 1 ∕ 2
1 ∕ 2 × 6 1 ∕ 2 × 7
5 7 9
5 ∕ 16 × 1 1 ∕ 2 5 ∕ 16 × 2 5 ∕ 16 × 2 1 ∕ 2 5 ∕ 16 × 3 5 ∕ 16 × 3 1 ∕ 2 5 ∕ 16 × 4
6 7 8 9
85.8 74.6
5 ∕ 8 × 3 1 ∕ 2
11 13 15
87.1 99.5
5 ∕ 8 × 4
5 ∕ 8 × 4 1 ∕ 2
112 124 137 162 186 143 161 179 197 165 188 212
5 ∕ 8 × 5
10 11 13 15
5 ∕ 8 × 5 1 ∕ 2
6 8 9
3 ∕ 8 × 2
5 ∕ 8 × 6 5 ∕ 8 × 7 5 ∕ 8 × 8 3 ∕ 4 × 5 3 ∕ 4 × 6 3 ∕ 4 × 7 3 ∕ 4 × 8 7 ∕ 8 × 5 7 ∕ 8 × 6 7 ∕ 8 × 7 7 ∕ 8 × 8
3 ∕ 8 × 2 1 ∕ 2
3 ∕ 8 × 3
11 12 14 15 17 18
3 ∕ 8 × 3 1 ∕ 2
8 9
3 ∕ 8 × 4
3 ∕ 8 × 4 1 ∕ 2
10 11
3 ∕ 8 × 5
3 ∕ 8 × 5 1 ∕ 2
3 ∕ 8 × 6
7 8 9
6 7 8
1 ∕ 2 × 2 1 ∕ 2
1 ∕ 2 × 3
1 ∕ 2 × 3 1 ∕ 2 236 Source: Rope diagram, Bethlehem Steel Co.; all data, US Simplified Practice Recommendation 198-50. 10 10.7 271 Safe Working Loads and Factors of Safety.— The maximum load for which a wire rope is to be used should take into account such associated factors as friction, load caused by bending around each sheave, acceleration and deceleration, and, if a long length of rope is to be used for hoisting, the weight of the rope at its maximum extension. The condition of the rope — whether new or old, worn or corroded — and type of attachments should also be considered. Factors of safety for standing rope usually range from 3 to 4; for operating rope, from 5 to 12. Where there is the element of hazard to life or property, higher values are used.
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