STEEL CABLES

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The modern demands of industry for speed and large capacity have called for strengths exceeding that possible to attain from hemp or manila ropes, which are not excessive in size or cost. As a result, steel ropes and cables have been developed and perfected to a high degree of strength and dependability. The majority of hoists and cranes use steel rope. Logging industries depend for most part on steel cables. Cable cars use special steel cables which in many cases are several miles long. Long tramways use light steel cables, for long spans where manila rope would scarcely maintain its own weight. High speed passenger elevators maintain safe and dependable service day after day only through the strength of the perfected flexible steel cable. However, as stated above, each particular type of service calls for some special type of cable. The following tables are not complete but will serve to indicate the scope of the field covered by this subject.

CAST STEEL ROPE

Composed of 6 strands and a hemp center, 7 wires to the strand

Diameter in Inches Approximate Circumference in Inches Approx. Breaking Strain in Tons of 2000lbs. Proper Working Load in Tons of 2000lbs. Minimum Size of Drum or Sheave inft.
1 1/2 4 3/4 63 12.6 11
1 3/8 4 1/4 53 10.6 10
1 1/4 4 46 9.2 9
1 1/8 3 1/2 37 7.4 8
1 3 31 6.2 7
7/8 2 3/4 24 4.8 6
3/4 2 1/4 18.6 3.7 5
11/16 2 1/8 15.4 3.1 4 3/4
5/8 2 13 2.6 4 1/2
9/16 1 3/4 10 2 4
1/2 1 1/2 7.7 1.54 3 1/2
7/16 1 1/4 5.5 1.10 3
3/8 1 1/8 4.6 .92 2 3/4
5/16 1 3.5 .70 2 1/4
9/32 7/8 2.5 .50 1 3/4

CAST STEEL ROPE

Composed of 6 strands and a hemp center, 19 wires to the strand

Diam. of Rope in Inches Approximate Circumference in Inches Approx. Breaking Strain in Tons of 2000lbs. Proper Working Load in Tons of 2000lbs. Minimum Size of Drum or Sheave inft.
2 3/4 8 5/8 211 42.2 11
2 1/2 7 7/8 170 34 10
2 1/4 7 1/8 133 26.6 9
2 6 1/4 106 21.2 8
1 7/8 5 3/4 96 19 8
1 3/4 5 1/2 85 17 7
1 5/8 5 72 14.4 6 1/2
1 1/2 4 3/4 64 12.8 6
1 3/8 4 1/4 56 11.2 5 1/2
1 1/4 4 47 9.4 5
1 1/8 3 1/2 38 7.6 4 1/2
1 3 30 6 4
7/8 2 3/4 23 4.6 3 1/2
3/4 2 1/4 17.5 3.5 3
5/8 2 12.5 2.5 2 1/2
9/16 1 3/4 10 2 2 1/4
1/2 1 1/2 8.4 1.68 2
7/16 1 1/4 6.5 1.30 1 3/4
3/8 1 1/8 4.8 .96 1 1/2
5/16 1 3.1 .62 1 1/4
1/4 3/4 2.2 .44 1

CAST STEEL ROPE

Composed of 6 strands and a hemp center, 37 wires to the strand

Diameter in Inches Approximate Circumference in Inches Approx. Breaking Strain in Tons of 2000lbs. Proper Working Load in Tons of 2000lbs. Minimum Size of Drum or Sheave inft.
2 3/4 8 5/8 200 40
2 1/2 7 7/8 160 32
2 1/4 7 1/8 125 25
2 6 1/4 105 21
1 3/4 5 1/2 84 17
1 5/8 5 71 14
1 1/2 4 3/4 63 12 3 3/4
1 3/8 4 1/4 55 11 3 1/2
1 1/4 4 45 9 3 1/4
1 1/8 3 1/2 34 6.8 2 3/4
1 3 29 5.8 2 1/2
7/8 2 3/4 23 4.6 2 1/4
3/4 2 1/4 17.5 3.5 1 3/4
5/8 2 11.2 2.2 1 3/4
9/16 1 3/4 9.5 1.9 1 1/2
1/2 1 1/2 7.25 1.45 1 1/4
7/16 1 1/4 5.50 1.10 1 1/4
3/8 1 1/8 4.20 .84 1

CAST STEEL ROPES FOR INCLINES

Six strands of 7 wires each—hemp center

Diam. of Rope in Inches Diam. of Sheaves or Drums in Feet, Showing Percentage of Life for Various Diams.
100 % 90 % 80 % 75 % 60 % 50 % 25 %
1 1/2 16 14 12 11 9 7 4.75
1 3/8 14 12 10 8.5 7 6 4.5
1 1/4 12 10 8 7.25 6 5.5 4.25
1 1/8 10 8.5 7.75 7 6 5 4
1 8.5 7.75 6.75 6 5 4.5 3.75
7/8 7.75 7 6.25 5.75 4.5 3.75 3.2
3/4 7 6.25 5.5 5 4.25 3.5 2.75
5/8 6 5.25 4.5 4 3.25 3 2.5
1/2 5 4.5 4 3.5 2.75 2 1.75

CAST STEEL HOISTING ROPES

6 strands of 19 wires each—hemp center

Diam. of Rope in Inches Diam. of Sheaves or Drums in Feet, Showing Percentage of Life for Various Diams.
100 % 90 % 80 % 75 % 60 % 50 % 25 %
1 1/2 14 12 10 8.5 7 6 4.5
1 3/8 12 10 8 7 6 5.25 4.25
1 1/4 10 8.5 7.5 6.75 5.5 5 4
1 1/8 9 7.5 6.5 5.5 5 4.5 3.75
1 8 7 6 5.5 4.5 4 3.50
7/8 7.5 6.75 5.75 5 4.25 3.5 3
3/4 5.5 4.5 4 3.75 3.25 3 2.25
5/8 4.5 4 3.75 3.25 3 2.5 2
1/2 4 3 3 2.75 2.25 2 1.5
3/8 3 2 1.5

STANDARD HOISTING ROPE

Six Strands—19 wires to the strand—One hemp core

Swedes Iron
Diam. in Inches Circum. in Inches Approx. Weight Per Foot Approx. Strain in Tons of 2000lbs. Proper Working Load in Tons of 2000lbs. Diam. of Drum or Sheave inft. Advised
2 3/4 8 5/8 11.95 111 22.2 17
2 1/2 7 7/8 9.85 92 18.4 15
2 1/4 7 1/8 8 72 14.4 14
2 6 1/4 6.30 55 11 12
1 7/8 5 3/4 5.55 50 10 12
1 3/4 5 1/2 4.85 44 8.8 11
1 5/8 5 4.15 38 7.5 10
1 1/2 4 3/4 3.55 33 6.5 9
1 3/8 4 1/4 3 28 5.5 8.5
1 1/4 4 2.45 22.8 4.56 7.5
1 1/8 3 1/2 2 18.6 3.72 7
1 3 1.58 14.5 2.90 6
7/8 2 3/4 1.20 11.8 2.36 5.5
3/4 2 1/4 .89 8.5 1.70 4.5
5/8 2 .62 6 1.20 4
9/16 1 3/4 .50 4.7 .94 3.5
1/2 1 1/2 .39 3.9 .78 3
7/16 1 1/4 .30 2.9 .58 2.75
3/8 1 1/8 .22 2.4 .48 2.25
5/16 1 .15 1.5 .30 2
1/4 3/4 .10 1.1 .22 1.50
Crucible Cast Steel
Diam. in Inches Circum. in Inches Approx. Weight Per Foot Approx. Strain in Tons of 2000lbs. Proper Working Load in Tons of 2000lbs. Diam. of Drum or Sheave inft. Advised
2 3/4 8 5/8 11.95 211 42.2 11
2 1/2 7 7/8 9.85 170 34 10
2 1/4 7 1/8 8 133 26.6 9
2 6 1/4 6.30 106 21.2 8
1 7/8 5 3/4 5.55 96 19 8
1 3/4 5 1/2 4.85 85 17 7
1 5/8 5 4.15 72 14.4 6.5
1 1/2 4 3/4 3.55 64 12.8 6
1 3/8 4 1/4 3 56 11.6 5.5
1 1/4 4 2.45 47 9.4 5
1 1/8 3 1/2 2 38 7.6 4.5
1 3 1.58 30 6 4
7/8 2 3/4 1.20 23 4.6 3.5
3/4 2 1/4 .89 17.5 3.5 3
5/8 2 .62 12.5 2.5 2.5
9/16 1 3/4 .50 10 2 2.25
1/2 1 1/2 .39 8.4 1.68 2
7/16 1 1/4 .30 6.5 1.30 1.75
3/8 1 1/8 .22 4.8 .96 1.50
5/16 1 .15 3.1 .62 1.25
1/4 3/4 .10 2.2 .44 1
Plow Steel
Diam. in Inches Circum. in Inches Approx. Weight Per Foot Approx. Strain in Tons of 2000lbs. Proper Working Load in Tons of 2000lbs. Diam. of Drum or Sheave inft. Advised
2 3/4 8 5/8 11.95 275 55 11
2 1/2 7 7/8 9.85 229 46 10
2 1/4 7 1/8 8 186 37 9
2 6 1/4 6.30 140 28 8
1 7/8 5 3/4 5.55 127 25 8
1 3/4 5 1/2 4.85 112 22 7
1 5/8 5 4.15 94 19 6.5
1 1/2 4 3/4 3.55 82 16 6
1 3/8 4 1/4 3 72 14 5.5
1 1/4 4 2.45 58 12 5
1 1/8 3 1/2 2 47 9.5 4.5
1 3 1.58 38 7.6 4
7/8 2 3/4 1.20 29 5.8 3.5
3/4 2 1/4 .89 23 4.6 3
5/8 2 .62 15.5 3.1 2.5
9/16 1 3/4 .50 12.3 2.4 2.25
1/2 1 1/2 .39 10 2 2
7/16 1 1/4 .30 8 1.6 1.75
3/8 1 1/8 .22 5.75 1.15 1.50
5/16 1 .15 3.8 .76 1.25
1/4 3/4 .10 2.65 .53 1

STRENGTH OF WIRE ROPE

in tons of 2,000 pounds

Diameter in Inches Wire Transmission Rope. One Hemp core surrounded by six strands of seven wires each.
Iron Crucible Cast Steel Extra Strong Crucible Cast Steel Plow Steel
2 3/4
2 1/2
2 1/4
2
1 3/4
1 5/8
1 1/2 32 63 73 82
1 3/8 28 53 63 72
1 1/4 23 46 54 60
1 1/8 19 37 43 47
1 15 31 35 38
7/8 12 24 28 31
3/4 8.8 18.6 21 23
5/8 6 13 14.5 16
9/16 4.8 10 11 12
1/2 3.7 7.7 8.85 10
7/16 2.6 5.5 6.25 7
3/8 2.2 4.6 5.25 5.9
5/16 1.7 3.5 3.95 4.4
9/32 1.2 2.5 2.95 3.4
1/4
Diameter in Inches Wire Transmission Rope. One Hemp core surrounded by six strands of nineteen wires each.
Iron Crucible Cast Steel Extra Strong Crucible Cast Steel Plow Steel
2 3/4 111 211 243 275
2 1/2 92 170 200 229
2 1/4 72 133 160 186
2 55 106 123 140
1 3/4 44 85 99 112
1 5/8 38 72 83 94
1 1/2 33 64 73 82
1 3/8 28 56 64 72
1 1/4 22.8 47 53 58
1 1/8 18.6 38 43 47
1 14.5 30 34 38
7/8 11.8 23 26 29
3/4 8.5 17.5 20.2 23
5/8 6 12.5 14 15.5
9/16 4.7 10 11.2 12.3
1/2 3.9 8.4 9.2 10
7/16 2.9 6.5 7.25 8
3/8 2.4 4.8 5.30 5.75
5/16 1.5 3.1 3.50 3.8
9/32
1/4 1.1 2.2 2.43 2.65

                                                                                                                                                                                                                                                                                                           

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