MIL-PRF-22/13C
DEPARTMENT OF DEFENSE SPECIFICATION
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Resistors, Variable, (Wirewound, Power Type), General Specification for.
(Copies of these documents are available online at https://assist.daps.dla.mil/quicksearch/ or
https://assist.daps.dla.mil or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D,
Philadelphia, PA 19111-5094).
2.3 Order of precedence. In the event of a conflict between the text of this document and the references cited
herein (except for related specification sheets), the text of this document takes precedence. Nothing in this
document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained
3. REQUIREMENTS
3.1 General. The requirements for acquiring the product described herein shall consist of this document and
3.2 Interface and physical dimensions. The resistors shall meet the interface and physical dimensions specified in
figure 1.
3.3 Nominal resistance and maximum current. The nominal total resistance and maximum current shall be as
specified in table I.
3.4 Electrical off position. The existence and location of an electrical off position at one end of the resistance
element is indicated by a single digit, in accordance with table II.
3.5 Shaft and type of mounting. The 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
3.6 Resistance tolerance. The resistance tolerance available is 10 percent.
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3.7 Power rating. The power rating shall be 750 watts at 25 C. The resistor shall be mounted on a steel panel, 12
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inches square, with a thickness of 0.063 inches. The hotspot for the panel shall not exceed 390 C.
3.8 Torque.
3.8.1 Operating torque. The operating torque shall not be less than 1 pound-inches (lb-in) minimum and 10.0 lb-in
maximum.
3.8.2 Stop torque. The stop torque shall be 15.0 lb-in maximum.
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3.9 Mechanical rotation. The mechanical rotation shall be 330 5 .
3.10 Hardware. Two 0.250-20 UNC-2A flathead machine screws of sufficient length to permit mounting on a 0.250
inch thick panel shall be supplied.
3.11 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin
content of resistor components and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a
minimum of 3 percent lead, by mass (see 6.4).
4. VERIFICATION
4.1 Sampling and inspection. Sampling and inspection shall be in accordance with MIL-PRF-22.
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