AMSC N/A FSC 5905
DISTRIBUTION STATEMENT A. Approved for public release: distribution is unlimited.
INCH-POUND
MIL-PRF-26G
14 June 2001
SUPERSEDING
MIL-PRF-26F
16 November 1993
PERFORMANCE SPECIFICATION
RESISTORS, FIXED, WIRE WOUND (POWER TYPE)
GENERAL SPECIFICATION FOR
This specification is approved for use by all Depart-
ments and Agencies of the Department of Defense.
1. SCOPE
1.1 Scope. This specification covers the general requirements for power type, wire-wound, 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 to 240 watts at 25 C, derated to 0 power at 350 C
(characteristics N and V) and precision axial lead types of .1, .5, and 1 percent initial resistance tolerances with power
ratings ranging from 1 to 10 watts at 25 C, derated to 0 power at 250 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
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__|__ ____|____ ____|____ ____|____
Style Characteristic Resistance Resistance
(1.2.1.1) (1.2.1.2) (1.2.1.3) tolerance
(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).
1.2.1.3 Resistance. The nominal resistance expressed in ohms, is identified by a three or four digit number in
accordance with the applicable associated specification (see 3.1).
1.2.1.4 Resistance tolerance. The resistance tolerance, when applicable, is identified by a single letter in
accordance with the applicable detail specification (see 3.1).
1.2.2 Power ratings. The nominal power ratings for the various styles and characteristics are as specified (see
3.1).
2. APPLICABLE DOCUMENTS
Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of
use in improving this document should be addressed to: Defense Supply Center, Columbus, ATTN:
DSCC-VAT, P.O. 3990, Columbus, Ohio, 43216-5000, by using the Standardization Document
Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.
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