INCH-POUND
MIL-PRF-22E
1 May 2007
SUPERSEDING
MIL-PRF-22D
w/Amendment 1
4 July 2005
PERFORMANCE SPECIFICATION
RESISTORS, VARIABLE, (WIREWOUND, POWER TYPE),
GENERAL SPECIFICATION FOR
This specification is approved for use by all Departments
and Agencies of the Department of Defense.
1. SCOPE.
1.1 Scope. This specification covers the general requirements for power type variable resistors having a
resistance element of wire, wound linear on an insulating strip shaped in an arc, such that a contact bears uniformly
on the resistance element when adjusted by a control shaft. The power ratings (see 3.1) cover a range from 6.25
watts to 1,000 watts, inclusive (see 6.2).
1.2 Classification.
1.2.1 Part or Identifying number (PIN). The PIN is in the following form, and as specified (see 3.1):
M22/01
-
0001
2
SB
Associated
Resistance value
Electrical off
Shaft and type
specification
designator
position
of mounting
number
(1.2.1.2)
(1.2.1.3)
(1.2.1.4)
1.2.1.1 Style. The style is identified by the two letter symbol "RP" followed by a two digit number. The letters
identify power type, wire-wound variable resistors and the number identifies the size and power rating.
1.2.1.2 Resistance value designator. The resistance value designator is a coded value which identifies the
resistance value and maximum current (see 3.1).
1.2.1.3 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 I.
1.2.1.4 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
Comments, suggestions, or questions on this document should be addressed to: Defense Supply Center, Columbus,
ATTN: DSCC VAT, Post Office Box 3990, Columbus, Ohio 43218-3990 or by email Resistor@dla.mil. Since contact
information can change, you may want to verify the currency of this address information using the ASSIST Online
database at https://assist.daps.dla.mil/ .
AMSC N/A
FSC 5905
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