MIL-DTL-21604F
6.3 Qualification With respect to products requiring qualification, awards will be made only for products which are,
at the time of award of contract, qualified for inclusion in Qualified Products List QPL 21604 whether or not such
products have actually been so listed by that date. The attention of the contractors is called to these requirements,
and manufacturers are urged to arrange to have the products that they propose to offer to the Federal Government
tested for qualification in order that they may be eligible to be awarded contracts or orders for the products covered
by this specification. Information pertaining to qualification of products may be obtained from (insert name, mailing
address, and email of qualifying activity). An online listing of products qualified to this specification may be found in
the Qualified Products Database (QPD) at https://assist.daps.dla.mil.
6.4 Definitions. For the purpose of this specification, the definitions listed in 6.5.1 through 6.5.7 apply.
6.4.1 Operating shaft. A journaled member which drives the rotating members of the switch.
6.4.2 Angle of throw. The number of degrees of rotation through which the shaft travels in moving from one
position of the switch to the next consecutive position.
6.4.3 Shorting type switch. Also called make-before-break. When switching from one position to the next, the
second contact is closed before the first is opened.
6.4.4 Nonshorting type switch. Also called break-before-make. When switching from one position to the next, the
first contact fully breaks before the second contact is made.
6.4.5 Section or deck. That part of a switch complete in itself except for means of operating it, and consisting of a
rotor and stator assembled as a unit with stationary and moving contacts.
6.4.6 Stator. The stationary insulating portion of the switch section.
6.4.7 Rotor. An assembly of contacts and insulating hub.
6.4.8 Tin whisker growth. The use of alloys with tin content greater than 97 percent, by mass, may exhibit tin
whisker growth problems after manufacture. Tin whiskers may occur anytime from a day to years after manufacture
and can develop under typical operating conditions, on products that use such materials. Conformal coatings applied
over top of a whisker-prone surface will not prevent the formation of tin whiskers. Alloys of 3 percent lead, by mass,
have shown to inhibit the growth of tin whiskers. For additional information on this matter, refer to ASTM-B545
(Standard Specification for Electrodeposited Coatings of Tin).
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