TABLE 51. — Steel-wire Rope — Specification Values. 79 



Cast steel wire to be of hard crucible steel with minimum tensile Strength of 155 kg/mm' or 220,000 lb/in* 

 and minimum elongation of 2 per cent in 254 mm (10 in.). ., .. c o i / , <: 



Plow steel wire to be of hard crucible steel with mmimum tensile strength ol 183 kg/mm^ or 200,000 

 lb/in2 and minimum elongation of 2 per cent in 254 mm uo in.) . t , , , 



Annealed steel wire to be of crucible cast steel, annealed, with minimum tensile strength of 77 kg/mm^ or 

 no 000 lb/in2 and minimum elongation of 7 per cent in 254 mm (10 in.). , ■ , , . 



' Type A: 6 strands with hemp core and 19 wires to a strand (= 6 X 19), or 6 strands with hemp core and 

 18 wires to a strand with jute, cotton or hemp center. 

 Type B: 6 strands with hemp core, and 12 wires to a strand with hemp center. 

 Type C' 6 strands with hemp core, and 14 wires to a strand with hemp or jute center. 

 Type AA: 6 strands with hemp core, and 37 wires to a strand (= 6 X 37) or 6 strands with hemp core and 

 36 wires to a strand with jute, cotton or hemp center. ^ 



Description. 



Galv. cast steel, Type A . . 



11 K l( U (( 



(( (( (( (( II 



u a i< II II 



Galv. cast steel, Type AA . 



II it t( (( <( 



it (( (( (( (( 

 It tt (( If It 



Galv. cast steel, Type B . . 



ti (< tt <( It 



tt tt It tt tt 

 tt tt tt tt tt 



Galv. cast steel. Type C . . 



Galv, plow steel, Type A. . 



ti it tt tt it 



II It tt It ti 

 It (( It It tt 



Galv. plow steel, Type AA 



Diameter. 



I 



It'. 



Approx. weight. 



kg/m 



0.31 



o-SS 

 2.23 

 5.06 



0.3s 

 0.58 

 2.23 

 5.28 

 0.25 

 0.42 

 1.68 

 3-94 

 1-59 

 4-35 

 0.31 



0-5S 

 2.23 

 4.66 



0.33 

 0.58 

 2.35 

 6.18 



lb/ft 



0.21 



0.37 

 1.50 

 3 40 

 0.22 



0-39 

 I -50 



3.55 

 0.17 

 0.28 



113 

 2.65 

 1.07 

 2.92 

 o. 21 

 0.37 

 I 50 

 3-13 

 o. 22 



0.39 

 1.58 

 4-15 



Minimum strength. 



kg 



3,965 



6,910 



27,650 



63,485 



3,840 



7,410 



27,650 



59,735 



2,995 



5,210 



20,890 



47,965 

 18,825 



51,575 

 4,690 

 8,165 



32,675 

 69,140 

 4,540 

 8,750 

 32,250 

 83,010 



lb. 



8,740 

 15,230 

 60,960 



139,960 



8,460 



16,330 



60,960 



131,690 



6,600 



11,500 



46,060 



105,740 

 41,500 



113,700 

 10,340 

 18,000 

 72,040 



152,430 

 10,000 

 19,300 

 71,100 



183,000 



TABLE 52. — Plow Steel Hoisting Rope (Bright). 



(After Panama Canal Specification No. 302, 1912.) 

 Wire rope to be of best plow steel grade, and to be composed of 6 strands, 19 wires to the strand, with hemp center. 

 Wires entering into construction of rope to have an elongation in 203.2 mm or 8 in. of about 2j per cent. 



TABLE 53. — Steel-wire Rope — Experimental Values. 



(Wire rope purchased under Panama Canal Spec. 302 and tested by U. S. Bureau of Standards, Washington, D. C.) 



Recommended allowable load for wire rope running over sheave is one fifth of specified min. strength. 

 Smithsonian Tables. 



