INCH-POUND
MIL-PRF-39012/21B
16 November 2006
SUPERSEDING
MIL-PRF-39012/21A
22 October 1969
PERFORMANCE SPECIFICATION SHEET
CONNECTORS, RECEPTACLE, ELECTRICAL, COAXIAL, RADIO FREQUENCY,
(SERIES BNC (UNCABLED), SOCKET CONTACT, JAM NUT MOUNTED, CLASS 2)
This specification is approved for use by all Depart-
ments and Agencies of the Department of Defense.
The requirements for acquiring the product described herein shall consist of
this specification sheet and MIL-PRF-39012.
FIGURE 1. General configuration.
AMSC N/A
FSC 5935
MIL-PRF-39012/21B
M39012/21-X001
M39012/21-X003
M39012/21-X002
Inches
.022
.059
.087
.099
.153
.156
.159
.181
.184
.187
.190
mm
.56
1.50
2.21
2.51
3.89
3.96
4.04
4.60
4.67
4.75
4.83
Inches
.368
.375
.380
.384
.429
.434
.439
.443
.495
.505
.508
mm
9.35
9.53
9.65
9.75
10.90
11.02
11.15
11.25
12.57
12.83
12.90
NOTES:
1. Dimensions are in inches.
2. For dimensions ‘A’, ‘B’, ‘C’, see table I.
3. Dimension ‘B’ is the largest overall diameter of the connector.
4. Metric equivalents are given for information only.
5. Orientation of mounting flats and bayonet studs shall be within
±
3° of the orientation shown.
6. All undimensioned pictorial representations are for reference purposes only.
7. Interface dimensions shall be in accordance with MIL-STD-348, socket contact.
FIGURE 1. General configuration – Continued.
2
MIL-PRF-39012/21B
TABLE I. Dash numbers and overall dimensions.
Part or Identifying Number
(PIN) 1/
M39012/21-X001
Dim.
A
B
C
A
B
C
A
B
C
Inches (millimeters) 2/
Minimum
Maximum
--
1.187 (30.15)
--
.585 (14.86)
.529 (13.44)
.653 (16.59)
--
1.312 (33.32)
--
.585 (14.86)
.654 (16.61)
.778 (19.76)
--
1.312 (33.32)
--
.585 (14.86)
.654 (16.61)
.778 (19.76)
Panel thickness 2/
Minimum
Maximum
.045 (1.14) .130 (3.30)
.045 (1.14)
.260 (6.60)
M39012/21-X002
(Not for new design)
M39012/21-X003
.045 (1.14)
.260 (6.60)
1/ For cross reference of dash number to superseded PIN or type designation see table III.
2/ Dimensions are in inches. Metric equivalents are given for information only.
X
Denotes connector body plating material option. The only plating options allowable are Silver or
Nickel over brass in accordance with MIL-PRF-39012. Only connectors of the same materials shall
be mated to avoid dissimilar metal problems.
CAUTION: A NICKEL PLATED BODY IS NOT FOR
USE IN APPLICATIONS WHERE PASSIVE INTERMODULATION GENERATION (PIM) MAY BE A
CONCERN
(http://amphenolrf.com/simple/PIM%20Paper.pdf).
Silver is the preferred plating
option.
Group qualification: See table II.
TABLE II. Group qualification. 1/ 2/
Submission and qualification of
any of the following connectors
M39012/21-X001, M39012/21-0002,
M39012/21-X003, M39012/22-0001
Qualifies the following
connectors
M39012/21-X001, M39012/21-X002,
M39012/21-X003, M39012/22-X001
Group
I
1/ If a connector manufacturer produces a connector which meets all the requirements for two or more
connector PIN’s (within the same series), the manufacturer may receive qualification approval for two
or more connector PIN’s qualifying the one connector. It is not necessary that such connectors be in
the same group. Each connector, however, must be marked with its own appropriate PIN. For group
qualification, the connectors must be of similar design and be of the same materials and plating.
2/ For qualification retention, where more then one part is listed in a group in this column, data may be
supplied on any of those parts in order to retain qualification for those parts in the corresponding right
hand column. The part does not necessarily have to be the part initially qualified.
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MIL-PRF-39012/21B
TABLE III. Cross reference of PINs.
PIN
M39012/21-0001
M39012/21-0002
M39012/21-0003
Substitute for type 1/
designation
UG-625/U
UG-1094/U
1/ The superseded PIN or the type designation is for cross reference only.
The PIN M39012/21-XXXX shall be used in all cases for marking and
identifying the connector.
ENGINEERING DATA
Nominal impedance: 50 ohms.
Frequency range: 0 to 4 GHz.
Voltage rating: 500 volts rms maximum working voltage at sea level. 125 volts rms maximum at
70,000 feet (4.437 kPa).
Temperature rating: -65°C to +165°C.
REQUIREMENTS
Design and construction: See figure 1.
Center contacts: 4 pounds (17.8 N), minimum axial force. 4 inch-ounces (0.03 Nm) minimum radial
torque.
Force to engage and disengage:
Longitudinal force – 3 pounds (13.34 N), maximum.
Torque – 2.5 inch-pounds (0.28 Nm), maximum.
Coupling mechanism retention force:
Not applicable.
Mating characteristics:
See MIL-STD-348 for mating dimensions.
Contacts with spring members:
Center contact (female):
Oversize test pin: .057 inch (1.45 mm) diameter minimum (non-closed entry contacts only).
Insertion depth: .125 inch (3.17 mm) minimum.
Number of insertions: 1.
Insertion force test: Steel test pin diameter - .054 inch (1.37 mm) minimum.
Test pin finish: 16 microinches (0.406 µm).
Insertion force: 2 pounds (8.90 N), maximum.
Withdrawal force test: Steel test pin diameter - .052 inch (1.32 mm), maximum.
Withdrawal force: 2 ounces (0.56 N), minimum.
Test pin finish: 16 microinches (0.406 µm).
4
MIL-PRF-39012/21B
Hermetic seal: Not applicable.
Leakage (pressurized connectors): Not applicable.
Insulation resistance: Method 302, test condition B of MIL-STD-202. 5,000 megohms minimum.
Contact resistance: In milliohms maximum.
Initial
2.0
.2
.4
After environment
2.5
Not applicable
Not applicable
Center contact
Outer contact (Silver)
Outer contact (Nickel)
Resistance to test prod damage: Not applicable.
Corrosion (salt spray): Method 101, test condition B, MIL-STD-202.
Voltage standing wave ratio (VSWR): Not applicable.
Dielectric withstanding voltage: Method 301 of MIL-STD-202. 1,500 volts rms at sea level.
Corona level:
Voltage: 375 volts minimum.
Altitude: 70,000 feet (4.437 kPa).
RF high potential withstanding voltage:
Voltage and frequency: 1,000 volts rms at 5 MHz.
Leakage current: Not applicable.
Contact durability: Insertion and withdrawal force 500 cycles minimum at 12 cycles/min maximum.
The mating force shall meet the mating characteristics requirements.
Vibration, high frequency: Method 204, test condition B of MIL-STD-202. No discontinuities.
Shock: Method 202 of MIL-STD-202.
Acceleration: 50 G’s at 7 milliseconds.
No discontinuities permitted.
Temperature cycling: Method 102, test condition C of MIL-STD-202, except high temperature shall be
200°C.
Thermal shock: Not applicable.
Moisture resistance: Method 106 of MIL-STD-202. No measurements at high humidity. Insulation
resistance shall be at least 200 megohms within 5 minutes after removal from humidity. Dielectric
withstanding voltage shall be met.
Cable retention force: Not applicable.
5
