The wire rope core supports the strands laid around it. The three types of wire rope cores arc fiber, wire strand, and independent wire rope (fig. 13-3).

[Figure 13-3.-Core construction]

A fiber core may be a hard fiber, such as manila, hemp, plastic, paper, or sisal. The fiber core offers the advantage of increased flexibility. It also serves as a cushion to reduce the effects of sudden strain and acts as an oil reservoir to lubricate the wire and strands (to reduce friction). Wire rope with a fiber core is used when flexibility of (he rope is important. . A wire strand core resists more heat than a fiber core and also adds about 15 percent to the strength of the rope; however, the wire strand core makes the wire rope less flexible than a fiber core. . An independent wire rope core is a separate wire rope over which the main strands of the rope are laid. This core strengthens the rope, provides support against crushing, and supplies maximum resistance to heat.  

	6x7 Rope
	Excellent abrasion resistance; less bending fatigue resistance.  Dragging and haulage in mines, inclined planes and tramways, sand lines.
	6 x 19 - Seale
	Characteristics Resistant to abrasion and crushing : medium fatigue resistance
	Typical Applications Haulage rope, choker rope, rotary drilling line
	6x2l Filler Wire
	Characteristics Less abrasion resistance more bending fatigue resistance
	Typical Applications Pull Ropes, load lines, backhaul ropes, draglines
	6x25 Filler Wire
	Characteristics Most flexible rope in classification: best balance of abrasion and fatigue resistance
	Typical Applications Most widely used of all wire ropes - cranes hoists, skip hoists, haulage, mooring lines, conveyors, etc.
	6x26 Warrington Seale
	Characteristics Good balance of abrasion and fatigue resistance
	Typical Applications Boom hoists, logging and tubing lines

Core	Characteristics	Typical Applications
	6 x 31 Warrington Seale 12 outside wires. Slightly more flexible than 6 x 25 rope with the same abrasion resistance IWRC shown, fiber core available	Overhead crane and mobile crane hoist ropes
	6 x 36 Warrington Seale 14 outside wires. More fatigue resistance; but less abrasion resistance than 6 x 25 rope. IWRC shown; fiber core available	Overhead crane and mobile crane hoist ropes; winch lines; large diameter towing lines
	6 x 41 Warrington Seale 16 outside wires. Good combination of fatigue and abrasion resistance for operating ropes 1WRC shown, fiber core available	Overhead crane and mobile crane hoist ropes; shovel and dragline hoist ropes
	6 x 41 Seale Filler Wire Same characteristics and applications as 6 x 41 Warrington Seale IWRC shown, fiber core available	Overhead crane and mobile crane hoist ropes; shovel and dragline hoist ropes
	6 x 49 Seale Warrington Seale 16 outside wires. Best fatigue resistance and abrasion resistance in 6 x 37 classification lWRC shown; fiber core available	Mooring, towing and anchor lines