MIL-DTL-18375H
6.4 Definitions.
6.4.1 Center wire. The center of all strands is an individual wire and is designated as a
center wire.
6.4.2 Core strand. A strand core consists of a single straight strand made of wires similar
to the other strands comprising the wire rope in arrangement and number of wires.
6.4.3 Diameter. The diameter of wire rope is the diameter of the circumscribing circle,
or the distance across the opposite strands.
6.4.4 Lay (twist). The helical form taken by the wires in the strand and by the strand in
the wire rope is characterized as the lay (twist) of the strands or wire rope, respectively. In a
right-hand lay, the wires of strands are the same direction as the thread on a right-hand screw,
and for a left-hand lay, the strands or wires lay in an opposite direction.
6.4.5 Length of lay (pitch). The distance parallel to the axis of the strand or cable, in
which a wire or strand makes one complete turn about the axis, is designated as the length of lay
(pitch) of the strand or wire rope.
6.4.6 Master reel. The master reel is the large manufacturing reel that is used to hold the
wire rope as it is continuously manufactured.
6.4.7 Minimum breaking strength. The minimum tension load that a wire rope must
support.
6.4.8 Ping. Ping is an audible sound given off as a result of an individual wire breaking
in the wire rope. The sound is amplified and fed into a speaker system to a level distinctly
detectable by the human ear.
6.4.9 Preforming. Wire and strand shaped, during fabrication of the wire rope, to
conform to the form or curvature that they take in the finished wire rope.
6.4.10 Regular lay. Wire rope in which the direction of the lay of the wires in the strand
is in an opposite direction to the lay of the strand in the wire rope.
6.4.11 Shipping reel. The shipping reels are cut from the master reel (see 6.4.6) as
needed.
6.4.12 Strand. Each group of wires helically twisted is designated as a strand.
6.4.13 Twist-off. Twist-off is a twisting severance of the strand or wire due to a
malfunctioning of the stranding equipment.
6.4.14 Wire. Each individual cylindrical element is designated as a wire.
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