INCH-POUND
MIL-PRF-27208/8H
11 October 2006
SUPERSEDING
MIL-PRF-27208/8G
13 June 2001
PERFORMANCE SPECIFICATION SHEET
RESISTORS, VARIABLE, WIRE WOUND,
(ADJUSTMENT TYPE, LEAD SCREW ACTUATED),
STYLE RT12
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 requirements for style RT12 adjustment type, lead screw actuated, wire
wound, variable resistors.
*
1.2 Part or Identifying Number (PIN). Resistors covered by this specification are identified by a PIN
which consists of a basis style and a coded number. The PIN is in the following form:
RT12
⏐
⏐
Style
C2P102
⏐
⏐
Coded number
(see
MIL-PRF-27208)
2. APPLICABLE DOCUMENTS
2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This
section does not include documents cited in other sections of this specification or recommended for additional
information or as examples. While every effort has been made to ensure the completeness of this list, document
users are cautioned that they must meet all specified requirements documents cited in sections 3 and 4 of this
specification, whether or not they are listed.
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 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
http://assist.daps.dla.mil.
AMSC N/A
FSC 5905
MIL-PRF-27208/8H
2.2 Government documents.
*
2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a
part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are
those cited in the solicitation or contract.
DEPARTMENT OF DEFENSE SPECIFICATION
MIL-PRF-27208
- Resistor, Variable, Wire wound, Nonprecision, General Specification for.
(Copies of these documents are available online at
http://assist.daps.dla.mil/quicksearch/
or
http://assist.daps.dla.mil
or from the Standard Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia PA 19111-5094.)
2.3 Order of precedence. In the event of a conflict between the text of this document, and the references cited
herein (except for associated specifications, specification sheets, or MS sheets); the text of this document takes
precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific
exemption has been obtained.
3. REQUIREMENTS
3.1 General. The requirements for acquiring the product described herein shall consist of this document and
MIL-PRF-27208.
3.2 Interface and physical dimensions. The resistors shall meet the interface and physical dimensions specified in
figure 1.
3.3 Power rating. The power rating shall be 0.750 watt, based on full load operation at an ambient temperature of
o
85 C.
3.4 Nominal resistance value, maximum resolution, and maximum rated ac or dc working voltage. Nominal
resistance values, maximum resolutions, and maximum rated ac or dc working voltages are specified in table I.
TABLE I. Nominal resistance value, maximum resolution,
and maximum rated ac or dc working voltage.
Nominal resistance
value
Ohms
10
20
50
100
200
500
1,000
2,000
5,000
10,000 2/
20,000 3/
Maximum
resolution 1/
Percent
2.2
2.0
1.3
1.1
0.9
0.6
0.5
0.4
0.3
0.3
0.3
Maximum rated ac or dc
working voltage
Volts
2.7
3.8
6.1
8.7
12.3
19.4
27.4
38.7
61.3
86.7
122.0
1/ Maximum resolution shown are theoretical.
2/ Value based on the use of wire having no less that a 0.001 inch nominal diameter.
3/ Value based on the use of wire having no less that a 0.0008 inch nominal diameter.
2
MIL-PRF-27208/8H
FIGURE 1. Style RT12.
3
MIL-PRF-27208/8H
Inches
0.003
0.010
0.015
0.025
0.028
mm
0.08
0.25
0.38
0.64
0.71
Inches
0.031
0.052
0.058
0.063
0.093
Mm
0.79
1.32
1.47
1.60
2.36
Inches
0.100
0.105
0.115
0.125
0.135
mm
2.54
2.67
2.92
3.18
3.43
Inches
0.190
0.250
0.260
0.300
0.315
mm
4.83
6.35
6.60
7.62
8.00
Inches
0.500
0.700
0.900
1.000
1.250
mm
12.70
17.78
22.86
25.40
31.75
NOTES:
1.
2.
3.
4.
5.
Dimensions are in inches.
Metric equivalents are given for general information.
Unless otherwise specified, tolerance is
±
0.005 (0.13mm).
The three leads shall be of stranded wire, AWG size 28 to 30, having a minimum length of 6 inches (152.4
mm); they shall be insulated with polytetrafluoroethylene, stripped 0.250 inch
±0.062
inch (6.35mm
±1.57mm)
from the end, and color coded.
The picturization of the styles above are given as a representative of the envelope of the item. Slight
deviations from the outline shown, which are contained within the envelope, and do not alter the functional
aspects of the device are acceptable.
FIGURE 1. Style RT12 - Continued.
3.5 Actual effective electrical travel. The actual effective electrical travel shall be 17 turns minimum and 27 turns
maximum.
3.6 Operating torque. The torque required to effect rotation shall be 8 inch-ounce maximum.
4. VERIFICATION
4.1 Sampling and inspection. Sampling and inspection shall be in accordance with
MIL-PRF-27208.
4
MIL-PRF-27208/8H
5. PACKAGING
*
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order
(see
6.2).
When packaging of materiel is to be performed by DoD or in-house contractor personnel, these personnel
need to contact the responsible packaging activity to ascertain packaging requirements. Packaging requirements are
maintained by the Inventory Control Point's packaging activities within the Military Service or Defense Agency, or
within the military service's system commands. Packaging data retrieval is available from the managing Military
Department's or Defense Agency's automated packaging files, CD-ROM products, or by contacting the responsible
packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use. The intended use specified in
MIL-PRF-27208
is applicable to this specification.
6.2 Acquisition requirements. Acquisition documents must specify the following:
a.
*
b.
c.
Title, number, and date of this specification, and the complete PIN (see
1.2).
If not otherwise specified (see
2.1),
the versions of the individual documents referenced will be those in
effect on the date of release of the solicitation.
Packaging requirements (see
5.1).
6.3 Supersession data. This specification supersedes
MIL-PRF-27208/8F,
22 October 1970 and
MIL-R-27208/3E,
19 December 1969. Style RT12, terminal types L and Y of this specification, are substitutes for style RT11 resistors
having the same resistance values as terminal types L and P, respectively, of
MIL-R-272008/3E.
6.4 Weight. The maximum weight is 4.5 grams.
*
6.4 Changes from previous issue. The margins of this specification are marked with asterisks to indicate where
changes from the previous issue were made. This was done as a convenience only and the Government assumes
no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the
requirements of this document based on the entire content irrespective of the marginal notations and relationship to
the last previous issue.
Custodians:
Army - CR
Navy - EC
Air Force – 11
DLA - CC
Review activities:
Army - AT, AV, MI
Navy - MC, OS
Air Force - 19
Preparing activity:
DLA-CC
(Project 5905-2006-054)
NOTE: The activities listed above were interested in this document as of the date of this document. Since
organizations and responsibilities can change, you should verify the currency of the information above using the
ASSIST Online database at
http://assist.daps.dla.mil.
5
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