MIL-DTL-87218E
6.4 Definitions.
6.4.1 Bare base wire rope. The term for the portions of a lockclad control cable
assembly where aluminum tubing is not swaged onto the wire rope. This area is also known as
the "bare" sections of lockclad control cable assemblies.
6.4.2 Base wire rope. The wire rope per MIL-DTL-83420 over which aluminum tubing
is swaged in order to manufacture lockclad.
6.4.3 Coefficient of thermal expansion. The change in length of lockclad material for
each degree of temperature change in inches per inch.
6.4.4 Deflection. Elongation of a specified length of wire rope or lockclad under a
specified tension load.
6.4.5 Effective area. The cross sectional area of wire rope or lockclad reflected as if the
combination of wires or wires and aluminum were a solid metal mass.
6.4.6 Lockclad. The term for the material resulting from the swaging of a tubing
material over wire rope or aircraft control cable material in such manner as to reflect a lower
elongation under tensile loading than the wire rope without the swaged cladding.
6.4.7 Minimum breaking strength (MBS). The minimum tension load that the base wire
rope of lockclad must support. The cladding material should not be considered additive to the
tensile strength of lockclad assemblies.
6.4.8 Outside diameter of lockclad. The diameter of the exterior of the cladding after
swaging onto the wire rope.
6.4.9 SV Value. Stiffness may be expressed in terms of SV Values. The units for SV
are lb-inch2/inch2, where "S" is the modulus of elasticity of steel, (30 X 106 psi) and "V" is the
effective area (see 6.4.5) of the wire rope or lockclad material. The SV value may be considered
as the theoretical tensile load that would double the length if the material did not yield or fail in
tension.
6.4.10 Swaging. The process of cold working the cladding material onto the base wire
rope to such intimate contact as necessary to meet the requirements of this specification for
lockclad.
6.4.11 Transition point. The point at which base wire rope extends beyond the cladding
of lockclad control cable assemblies.
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