Nominal Line Diameter (inches) 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1 1/8 1 1/14 1 1/2 1 5/8 1 3/4 2 Table 1-3.—Safe Working Load of Braided Synthetic Fiber Line APPROXIMATE  SAFE  WORKING  LOADS  OF  NEW BRAIDED SYNTHETIC FIBER LINES (LB) SAFETY FACTOR = 5 Nylon Cover Nylon Cover Polyester  Cover Nylon Core Polypropylene Core Polypropylene Core 420 — 380 640 — 540 880 680 740 1,200 1,000 1,060 1,500 1,480 1,380 2,100 1,720 — 2,400 2,100 2,400 3,500 3,200 2,860 4,800 4,150 3,800 5,700 4,800 5,600 8,000 7,000 — 8,800 8,000 — 12,800 12,400 — 16,000 14,000 — 19,400 18,000 — 23,600 20,000 — Construction Wiie rope consists of three parts: wires, strands, and core (fig. 1-3). In the manufacture of wire rope, a number  of  WIRES  are  laid  together  to  form  the STRAND.  Then  a  number  of  STRANDS  are  laid together around a CORE to form the wire ROPE. Wire rope that is made up of a large number of small wires is flexible. The small wires are, however, easily broken,  so  the  wire  rope  does  not  resist  external abrasion. Wire rope that is made up of a smaller number The basic unit of wire-rope construction is the individual wire, which may be made of steel, iron, or other metal in various sixes. The number of wires to a strand will vary, dependingonthepurpose for which the wire rope is intended. Wiie rope is designated by the number of strands per rope and the number of wires per strand. Thus a 1/2-inch, 6 by 19 wire rope will have six strands with 19 wires per strand; but it will have the same outside diameter as a 1/2-inch, 6 by 37 wire rope, which will have six strands with 37 wires of much smaller size per strand. Figure 1-3.—Parts of a wire rope. 1-5