MIL-S-45527A(WC)
3.2.4 Seven-wire strand. Seven-wire strand shall be composed of six
outer wires wound around a common core wire. The diameter of the core
wire shall be 5 to 15 percent larger than the outer wire diameter. Pitch
for seven-wire strands shall be between 5 and 5 1/2 times the strand
diameter.
3.2.5 Construction of ends. End construction shall be as specified
on the applicable drawing. Brazing or welding material shall not inter-
fere with the operation of the spring. After brazing or welding, residual
flux shall be neutralized and removed by an appropriate solvent to prevent
subsequent corrosion.
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3.2.6 Pitch. The pitch of the active coils shall be as specified
on the applicable drawing. Unless otherwise specified, end coils of com-
pression springs with square and ground ends shall decrease uniformly
from full pitch to a pitch of one wire diameter.
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3.2.6.1 Uniformity. The pitch of the active coils of springs shall
be sufficiently uniform so that when compressed, unsupported laterally, to
a length equal to 80 percent of deflection, see Figure 1, none of the active
coils shall be in contact. When the design of the spring is such that it
cannot be compressed without supporty this requirement shall be waived.
3.2.7 Solid height. The solid height shall be as specified on the
applicable drawing. The solid height of a helical compression spring
shall be the perpendicular distance between the plates of a government
approved testing machine, when the spring is compressed with a test load
to bring all coils in contact. In no case shall this test load exceed by
more than 50% the load beyond which no appreciable deflection takes place.
nor shall the test load be held for any appreciable length of time.
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3.3 Performance. The springs shall contain the required load-
height relationships specified on the applicable drawing. Unless other-
wise specified, springs shall be preset prior to performance testing.
Testing shall be as specified in 4.5.3.2.
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Springs shall be marked in accordance with MIL-W-13855.
3.4 Marking.
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Workmanship shall be in accordance with MIL-W-13855.
3.5 Workmanship.
4. QUALITY ASSURANCE PROVISIONS
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