MIL-DTL-83420M
6.4.4 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.
6.4.5 Lubricant leak-out. Lubricant leak-out (see 3.3.4) and evaporation of the lubricant
applied to the wire rope during fabrication and preparation of shipment can be expected. In
order to ensure optimum performance with wire rope manufactured to this specification, the user
should relubricate the wire rope upon installation and periodically throughout its service life.
The method of lubrication, frequency, and identity of the approved military standard lubricant
should be included in the appropriate aircraft maintenance manuals.
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 which 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 Strand core. A strand core consists of a single straight strand made of wires
similar to the other strands comprising the cable in arrangement and number of wires.
6.4.14 Twist-off. Twist-off is a twisting severance of the strand or wire due to a
malfunctioning of the stranding equipment.
6.4.15 Wire. Each individual cylindrical element is designated as a wire.
6.4.16 Wire rope. A group of 3 or more strands helically twisted is designated as a wire
rope.
6.4.17 Wire rope diameter. The diameter of wire rope is the diameter of the
circumscribing circle, or the distance across opposite strands.
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