MIL-DTL-87161F
of lay (see 6.4.4) shall be not more than 11 nor less than 9 times the respective nominal strand
diameters.
3.3.3.2 Type I, 1 x 7 class, construction 2. Strand of this type, class, and construction
shall consist of a layer of 6 wires laid around a center wire in a left-hand direction. The length of
lay shall be not more than 11 nor less than 9 times the respective nominal strand diameters.
3.3.3.3 Type II, 1 x 19 class, construction 1. Strand of this type, class, and construction
shall consist of a layer of 6 wires laid around a center wire (see 6.4.1) in a left-hand direction and
a layer of 12 wires laid over the 7-wire strand in a right-hand direction. The length of lay of the
first operation 7-wire strand shall not exceed 60 percent of the lay of the second operation 12-
wire outside layer. The length of lay of the second operation 12-wire outside layer shall not be
more than 11 nor less than 9 times the respective nominal strand diameter.
3.3.3.4 Type II, 1 x 19 class, construction 2. Strand of this type, class, and construction
shall consist of a layer of 6 wires laid around a center wire in a right-hand direction and a layer
of 12 wires laid over the 7-wire strand in a left-hand direction. The length of lay of the first
operation 7-wire strand shall not exceed 60 percent of the lay of the second operation (outside)
layer of 12 wires. The length of lay of the second operation 12-wire outside layer shall not be
more than 11 nor less than 9 times the respective nominal strand diameter.
3.4 Performance.
3.4.1 Breaking strength. When tested in accordance with 4.4.2, the steel wire strand
3.4.2 Stretch limits. When tested in accordance with 4.4.3, the stretch in the steel wire
strand shall not exceed 1 percent when it is loaded to 60 percent of the MBS as shown in table I.
3.4.3 Adherence of coating. The zinc coating shall not crack or flake when tested in
accordance with 4.4.5. Loosening or detachment during the adhesion test of superficial, small
particles of zinc formed by mechanical polishing of the surface of zinc-coated wire shall not be
cause for rejection.
3.4.4 Ductility of steel. Composition A or B wire shall not fracture when tested in
accordance with 4.4.6.
3.4.5 Test load. Each wire strand shall carry 85 percent of its respective MBS load, as
shown in table I, without any failures.
3.5 Identification of product.
3.5.1 Identification by number. Each manufacturer shall assign a significant
identification number on each manufacturing reel or steel wire strand. When the steel wire
strand on the manufacturing reel is cut to specified lengths for transfer to the shipping reel
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