[INCH-POUND]
A-A-55512B
18 August 2014
SUPERSEDING
A-A-55512A
11 June 2001
COMMERCIAL ITEM DESCRIPTION
RESISTOR, THERMALLY SENSITIVE (THERMISTOR)
The General Services Administration has authorized the use of this
Commercial Item Description (CID) for all federal agencies.
1. SCOPE. This (CID) covers the general requirements for a thermistor. This thermistor is a stainless
steel probe with a flange, for air (open ended) and liquid (sealed ended) measurements. These parts
come with insulated leads in four different lengths. Thermistors covered by this CID are intended for
commercial/industrial applications and are not used in military systems needing stringent environmental
and electrical requirements.
*
2. CLASSIFICATION OR PART IDENTIFICATION NUMBER (PIN). This CID uses a classification
system which is included in the PIN as shown in the following examples (see 7.1).
AA55512
-
Z
510
J
04
CID
Curve
Resistance value
Resistance
Lead
number
(see table I)
(see 3.4 and
tolerance
length
table II)
(see 3.6)
(see 3.7)
3. SALIENT CHARACTERISTICS.
3.1 Interface and physical dimensions. The thermistor supplied to this CID shall meet the interface and
physical dimensions as specified herein (see figure 1).
3.2 Material. The material shall be as specified herein.
3.2.1 Body. The body of the thermistor shall be of negative temperature coefficient (NTC) material.
3.3 Finish. The finish shall be to the best commercial practices.
3.4 Resistance. The resistance measured at +25°C and expressed in ohms shall be as specified in table I
and is identified by a three digit number. The first two digits represent significant figures, and the last digit
specifies the number of zeros to follow.
Beneficial comments, recommendations, additions, deletions, clarifications, etc., and any data that may
improve this document should be sent to: DLA Land and Maritime, ATTN: VAT, Post Office Box 3990,
Columbus, OH 43218-3990, or emailed to 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
AMSC N/A
FSC 5905
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