Comments, suggestions, or questions on this document should be addressed to: DLA Land and Maritime,
ATTN: 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
INCH-POUND
MIL-PRF-26H
w/Amendment 1
18 November 2010
SUPERSEDING
MIL-PRF-26H
15 September 2006
PERFORMANCE SPECIFICATION
RESISTORS, FIXED, 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, wirewound, fixed resistors for use in
electrical, communications, and associated equipment. Included are general purpose styles of 5 percent initial
resistance tolerance, with power ratings ranging from 3 watts to 240 watts at 25
O
C, derated to 0 power at 350
O
C
(characteristics N and V) and precision axial lead types of .1(B) percent, .5 (D) percent, and 1 (F) percent initial
resistance tolerances with power ratings ranging from 1 watt to 10 watts at 25
O
C, derated to 0 power at 250
O
C
(characteristic U).
1.2 Classification.
1.2.1 Part or Identifying Number (PIN). The PIN is in the following form (see 3.1):
RW80 V 49R9 F
Style
(1.2.1.1)
Characteristic
(1.2.1.2)
Resistance
(1.2.1.3)
Resistance
Toleranc
e
(1.2.1.4)
1.2.1.1 Style. The style is identified by the two-letter symbol "RW" followed by a two-digit number; the letters
identify power type, wire-wound, fixed resistors, and the number identifies the size, wattage rating, and construction
of the resistors (see
3.1).
1.2.1.2 Characteristic. The characteristic is identified by a single letter that identifies the maximum continuous
operating temperature (surface hot spot), the high ambient temperature derating (see
3.1), the minimum insulation
resistance value, and the degree of moisture resistance in accordance with the applicable associated specification
(see 3.1).
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