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Understanding Military Spec

Resistors

The military specifications for resistors are numerous and refer to the type of material which the Resistor is made of. The military part numbers all start with the letter "R", followed by another letter denoting the material. In some cases a third letter, usually an "R" may be used. This third letter "R" refers to a high-reliability type (called "Hi-rel").
Some of the more common Resistor Military Specifications and their associated part number prefixes are as follows:


MIL-SPEC	PREFIX	TYPE
MIL-R 11	RC	Composition Fixed
MIL-R 19	RA	Wire Wound Variable
MIL-R 22	R-P	Power Variable
MIL-R 26	RW	Wire Wound Fixed
MIL-R 93	RB	Wire Wound Fixed
MIL-R 94	RV	Composition Variable
MIL-RlO5O9	RN	Film Fixed
MIL-RI8546	RN	Film Fixed
MIL-RI8546	RE	Wire Wound Fixed
MIL-RI9365	RX	Wire Wound Adjustable
MIL-R22097	RJ	Carbon Trimmers
MIL-R22684	RL	Film Fixed
MIL-R27208	RT	Trimming Potentiometer
MIL-R39005	RBR	Wire Wound Fixed
MIL-R39007	RWR	Wire Wound Fixed
MIL-R39008	RCR	Composition Fixed
MIL-R39009	RER	Wire Wound Fixed
MIL-R39015	RTR	Trimming Potentiometer
MIL-R39017	RLR	Film Fixed
MIL-R39035	RJR	Carbon Trimmers
MIL-R55182	RNR	Film Fixed

To determine the "approved" vendors, refer to the QPL (Qualified Product List) numerically identical to the, MIL-Spec.(i.e.,MIL-R-ll QPL 11).
An example of a military resistor part number, under Mil-Spec Mil-R-55182 for metal film resistors, would look like this:

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