MIL-PRF-39002/3C
6.2 Acquisition requirements. Acquisition documents must specify the following:
a.
Title, number, and date of this date of this specification, the applicable associated specification, and the
complete PIN.
b.
Unless otherwise specified (see 2.1), the versions of the individual documents referenced will be those in
effect on the date of release of the solicitation.
c.
Packaging requirements (see 5.1).
6.3 Type designation. The type designation for identifying these parts is as follows:
RK11
SL
C
S
101
Style
Shaft and type
Resistance temperature
Terminal
Resistance
(6.3.1)
mounting
characteristic
(6.3.4)
(6.3.5)
(6.3.2)
(6.3.3)
NOTE: This is for information only. For the correct PIN, see 1.2.
6.3.1 Style. The style is identified by the two letter symbol "RK" followed by a two digit number; the letters identify
semi-precision wirewound, variable resistors, and the number identified the physical size.
6.3.2 Shaft and type mounting. The style of shaft, type of mounting, and length of shaft is identified by a two letter
symbol. The first letter indicates the style of shaft and type of mounting and the second letter indicates the length of
shaft, see MIL-PRF-39002.
6.3.3 Resistance temperature characteristic. The resistance temperature characteristic of the completed resistor
is identified by a single letter, see MIL-PRF-39002.
6.3.4 Terminals. The terminals are identified by a single letter, see MIL-PRF-39002.
6.3.5 Resistance. The nominal total resistance value expressed in ohms is identified by a three digit number; the
first two digits represent significant figures and the last digit specified the number of zeros to follow, see
6.4 Extension of qualification. The manufacturers qualified to style RK09 (MIL-PRF-39002/1) can extend
qualifications to style RK11 by submitting and passing the following additional test:
a.
13 units tested to the strength of mounting bushing test.
b.
13 units tested to the shaft to bushing seal test.
c.
No failures are allowed.
6.5 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).
5
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