MIL-DTL-83420M
3.3.3.3 Nylon jacketed coating for type II. The nylon jacketing (see 6.4.2) material shall
meet the requirements of this specification as specified in 3.3.3.3.1 and shall be extruded over
the rope. Only virgin nylon material shall be used in coating on type II wire rope.
3.3.3.3.1 Nylon jacketing physical and mechanical properties. The nylon used to jacket
the wire rope shall be in accordance with ASTM D 789 and meet the requirements listed below
when tested as specified in the following paragraphs:
Property
Requirement
Test paragraph
Ultimate tensile strength
5,000 psi minimum
Elongation
250 percent minimum
Specific gravity
0.95 to 1.09
Water absorption
1.5 percent maximum
-65 °F (-54 °C) maximum
Brittleness
Stiffness
35,000 psi minimum
100/35 °C at 66/264 psi minimum
Heat deflection
320 °F to 364 °F (160 °C to 190 °C)
Melting range
Burn resistance
4 inch/minimum
3.3.4 Lubricant. Each wire of the wire rope shall be coated with a friction-preventive,
non-corrosive lubricant. As a minimum, the lubricant shall operate at temperatures from -65 °F
to +250 °F (-54 °C to +121 °C). Any change in lubricant is considered a major process change
and may require requalification testing (see 3.2).
3.4 Construction.
3.4.1 Wire. The wire (see 6.4.15) used in steel wire rope cable shall be cylindrical,
smooth, and of uniformly high quality.
3.4.1.1 Wire properties. Tensile strengths of wire and wire sizes shall be such that wire
rope will be capable of meeting the requirements of this specification.
3.4.1.2 Preforming (see 6.4.9) of wires and strands. The individual wires and strands
composing the wire rope shall be shaped into the exact helical position they will have in the
finished wire rope, so that if the wire rope is cut or severed there is no tendency for the measured
diameter of the wire rope at the unseized cut ends to increase by more than the amount specified
in table I.
3.4.1.3 Splicing and joining. All splices or joints in wires less than 0.008 inch may be
longitudinally twisted. All wire sizes of 0.008 inch or more shall be brazed or welded. Any
joints in individual wires in any layer of a strand (see 6.4.12) shall not be closer than 20 feet
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