Tables 55-57 



TABLE 55. — Steel-wire Rope — Specification Values 



"5 



Cast steel wire to be of hard crucible steel with minimum tensile strength of 155 kg/mm 2 or 220,000 lb/in' 

 and minimum elongation of 2 per cent in 254 mm (10 in.). .-«,.,, 



Plow steel wire to be of hard crucible steel with minimum tensile strength of 183 kg/mm 2 or 260,000 

 lb/in 2 and minimum elongation of 2 per cent in 254 mm (io in.). 



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

 no 000 lb/in 2 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 » strands with hemp core and 

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



TABLE 56. — 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 w're rope running over sheave is one fifth of specified min. strength. 



TABLE 57. — 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 25 per cent. 



Smithsonian Tables. 



