MIL-DTL-641F
metal parts; all marking shall remain legible; and it shall be possible to remove and replace screw-on shells
(where used) without the use of tools other than a screwdriver inserted in the slot in the end of the metal portion of
the jack.
3.6.7 Vibration. When jacks are tested as specified in 4.6.8, there shall be no damage or loosening of parts,
loss of electrical continuity for more than a period of 10 microseconds with a current of 100 milliamperes dc, and
the mating plug shall not separate from the jack, and the contact resistance shall be as specified in 3.6.1.
3.6.8 Shock (specified pulse). When jacks are tested as specified in 4.6.9, there shall be no visual evidence of
mechanical damage, rupture of dielectric materials, loss of electrical continuity for more than a period of ten
microseconds with a current of 100 milliamperes dc, or loosening of parts.
3.6.9 Spring life. When jacks are tested as specified in 4.6.10, there shall be no danger or loosening of parts,
and the insertion and withdrawal forces, dielectric withstanding voltage, and contact resistance shall be as
3.6.10 Water seal (see 3.1). When jacks are tested as specified in 4.6.11, there shall be no water leakage.
3.6.11 Salt spray (corrosion). When jacks are tested as specified in 4.6.12, there shall be no excessive
corrosion of metal parts; the insulation shall not be cracked, warped, or delaminated; and the contact resistance
shall be as specified in 3.6.1. Excessive corrosion shall be construed as any corrosion which interferes with
electrical or mechanical performance, or, in the case of plated metals, when the corrosive action has passed
through the plating and attacked the basis metal. Exposed screw threads may be protected with a suitable
coating.
3.6.12 Frame strength (see 3.1). When jacks are tested as specified in 4.6.13, there shall be no rupture of
joints.
3.6.13 Strain relief (see 3.1). When tested in accordance with 4.6.14, there shall be no evidence of damage or
cutting of the conductors or stay cord.
3.6.14 Contact spring pressure (see 3.1).
3.6.14.1 Mated jacks. When tested in accordance with 4.6.15.1, the force required to lift each contact spring
sufficiently to break electrical contact with the mating lug shall be 16 ounces minimum.
3.6.14.2 Unmated jacks. When tested in accordance with 4.6.15.2, the force required to lift each contact
spring of the jack by an amount between 0.005 inch and 0.015 inch shall be 12 ounces minimum.
3.6.15 Contact spring evertravel (see 3.1). When tested as specified in 4.6.16, the contact springs shall flex a
minimum of 0.080 inch and a maximum of 0.030 inch, except the number one contact spring may flex a maximum
of 0.045 inch.
3.6.16 Static load (see 3.1). When jacks are tested as specified in 4.6.17, there shall be no damage or
loosening of parts.
3.6.17 Longitudinal pull (see 3.1). When tested in accordance with 4.6.18, there shall be no damage or
loosening of parts, loss of electrical continuity for more than a period of ten microseconds with a current of
100 ± 2 milliamperes dc, and the mating plus shall not separate from the jack, and the contact resistance shall be
as specified in 3.6.1.
3.7 Marking. Jacks shall be marked in accordance with method I of MIL-STD-1285, and shall include the
manufacturer's name, trademark, or source code and the part number (see 3.1).
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