INCH-POUND
MIL-DTL-38999K
17 December 1999
SUPERSEDING
MIL-C-38999J
06 April 1990
DETAIL SPECIFICATION
CONNECTORS, ELECTRICAL, CIRCULAR, MINIATURE, HIGH DENSITY,
QUICK DISCONNECT (BAYONET, THREADED, AND BREECH COUPLING),
ENVIRONMENT RESISTANT, REMOVABLE CRIMP AND HERMETIC SOLDER CONTACTS
GENERAL SPECIFICATION FOR
This specification is approved for use by all Departments
and Agencies of the Department of Defense.
1. SCOPE
1.1 Scope. This specification covers four series of miniature, high density, bayonet, threaded, or breech
coupling, circular, environment resistant, electrical connectors using removable crimp or fixed hermetic
solder contacts, and are capable of operation within a temperature range of -65°C to +200°C (see 1.3.1d).
See 6.1 for intended use and applications.
1.2 Description. All series include rear release removable pin and socket contacts with crimp
termination. All series are designed to assure proper orientation of the mating halves prior to electrical
circuit closure. All series include hermetically sealed receptacles with fixed contacts for solder termination.
All series include EMI shielding capability. Series I, III, and IV connectors with conductive finishes provide
electrical continuity between mated shells prior to contact engagement and have the contacts so located as
to be protected from handling damage and inadvertent electrical contact. Series II provides low silhouette
for minimum size and weight and includes connectors which provide shell-to-shell electrical continuity when
mated.
1.3 Classification.
1.3.1 Connectors. Connectors fabricated to this specification are classified as follows:
a. Series: The series I, II, III, and IV connectors are not interchangeable or intermateable.
I
II
III
IV
-
-
-
-
Scoop-proof, bayonet coupling.
Non-scoop-proof, bayonet coupling, low silhouette.
Scoop-proof, triple start, self-locking, threaded coupling.
Scoop-proof, breech coupling.
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: VAI, 3990 East Broad Street, Columbus OH 43216-5000 by using the self-address
Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this
document or by letter.
AMSC N/A
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
FSC 5935
MIL-DTL-38999K
b. Types:
(1) Plugs:
- Straight, without spring fingers.
- Straight, with spring fingers that make contact to receptacle shell prior to contact
engagement.
- Straight with spring fingers that make contact to receptacle shell after contacts
engage.
- Lanyard release.
(2) Receptacles:
-
-
-
-
-
c. Classes:
Series I and II:
E -
G -
H -
P -
T -
Y -
Environment resisting - Box and thru-bulkhead mounting receptacle types. Other
types with rear accessories are inactive for new design.
Environment resisting - wall and jam nut mounting receptacle and plug types, space
grade.
Hermetically sealed - space grade.
For potting - Includes potting form and short rear grommet. (inactive for new design
for Air Force).
Environment resisting - Wall and jam-nut mounting receptacle and plug types. These
designs incorporate provision (thread and teeth) for rear accessory attachment.
Hermetically sealed.
Box mounting, both front and rear panel mounting.
Wall mounting, both front and rear panel mounting.
Jam-nut, rear panel mounting.
Solder mounting.
Thru-bulkhead.
Series III and IV:
C
F
G
H
J
K
M
N
R
S
- Environment resisting - Nonconductive plating.
- Environment resisting - Conductive plating.
- Environment resisting - Conductive plating, space grade.
- Hermetically sealed - Corrosion resistant steel, passivated, space grade.
- Environment resisting - Conductive, Corrosion resistant composite.
- Environment resisting - Corrosion resistant steel with Firewall barrier. .
- Environment resisting - Conductive, Corrosion resistant composite.
- Hermetically sealed - Corrosion resistant steel, electro-deposited nickel.
- Same as F, but higher corrosion requirement.
- Environment resisting with firewall barrier, corrosion resistant steel - Electrodeposited
nickel.
X - Same as W, but higher corrosion requirement.
W - Environment resisting - Corrosion resistant plating.
Y - Hermetically sealed - Corrosion resistant steel, passivated.
d. Temperature ranges: The upper temperature is the maximum internal hotspot temperature
resulting from any combination of electrical load and ambient conditions.
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MIL-DTL-38999K
Series I and II finishes:
A -
B
C
D
E
F
N
-
-
-
-
-
-
Silver to light iridescent yellow color cadmium plate over nickel (conductive)
-65°C to +150°C (inactive for new design).
Olive-drab cadmium plate over a suitable underplate (conductive) -65°C to +175°C.
Anodic (nonconductive) -65°C to +200°C.
Fused tin, carbon steel (conductive) -65°C to +150°C.
Corrosion resistant steel, passivated (conductive) -65°C to +200°C.
Electroless nickel coating (conductive) -65°C to +200°C.
Hermetic seal or environment resisting corrosion resistant steel (conductive plating)
-65°C to +200°C.
Same as F, but higher corrosion requirement.
Same as A, but higher corrosion requirement.
Same as B, but higher corrosion requirement.
R -
U -
X -
Series III and IV classes:
C
F
G
H
J
K
M
N
-
-
-
-
-
-
-
-
Anodic (nonconductive) -65°C to +200°C.
Electroless nickel coating (conductive) -65°C to +200°C.
Same as F but space grade.
Same as Y but space grade.
Olive-drab cadmium plate, composite, (conductive) -65°C to +175°C.
Corrosion resistant steel passivated (conductive) -65°C to +200°C.
Electroless nickel coating, composite, (conductive) -65°C to +200°C.
Corrosion resistant steel with electrodeposited nickel plating (conductive)
-65°C to +200°C.
Same as F, but higher corrosion requirement.
Corrosion resistant steel with electrodeposited nickel plating (conductive)
-65C° to +200°C.
Olive-drab cadmium plate over a suitable underplate (conductive) -65°C to +175°C.
Same as W, but higher corrosion requirement.
Corrosion resistant steel passivated (conductive) -65°C to +200°C.
R -
S -
W-
X -
Y -
e. Contact styles:
(1) Contact designators for connectors using standard contact arrangements as indicated in
MIL-STD-1560 are as follows:
P -
S -
H -
J -
X -
Z -
C -
Pin - Including hermetics with solder cups, 500-cycle contact.
Socket - Including hermetics with solder cups, 500-cycle contact.
Pin - 1500-cycle contact.
Socket - 1500-cycle contact.
Pin - With eyelet (hermetic).
Socket - With eyelet (hermetic).
Feedthrough.
The P, S, H, J, X, Z, or C designators are used to indicate that connectors will be used with full
compliments of the applicable standard contacts as indicated in MIL-STD-1560.
The connectors that accommodate crimp removable contacts (P, S, H, and J) may be ordered
without standard contacts by adding an appropriate note on the purchase order; however, the
connector Part or Identifying Number (PIN) and the marking requirements remain unchanged
(see 3.4.1.1, 3.43, and 6.2).
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MIL-DTL-38999K
(2) Contact designators for connectors using other than standard contact arrangements as
indicated in MIL-STD-1560 are as follows:
A -Pin contact insert.
B -Socket contact insert.
The A and B designators are used to indicate that the connectors will be used with other than
standard contacts as indicated in MIL-STD-1560 (example: shielded, coaxial thermocouple,
fiber optic contacts). The A and B designators are part of the connector PINs and should be
marked on the connectors.
The standard contacts should not be supplied with the connectors. The contacts that will be
used with the connectors must be ordered separately (see 3.4.1.1, 3.43, and 6.2).
Note: When other than standard power contacts are used, the requirements stated herein may
not be met.
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.
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 listed in the issue of the Department of Defense Index of Specifications and Standards
(DoDISS) and supplement thereto, cited in the solicitation (see 6.2).
SPECIFICATIONS
FEDERAL
QQ-N-290
QQ-P-416
-
-
Nickel Plating (Electrodeposited).
Plating, Cadmium (Electrodeposited).
DEPARTMENT OF DEFENSE
MIL-C-17
MIL-S-901
MIL-DTL-5624
MIL-S-7742
MIL-A-8625
MIL-DTL-22520
MIL-W-22759
MIL-C-39029
MIL-A-46146
-
-
-
-
-
-
-
-
-
Cables, Radio Frequency, Flexible and Semirigid,
General Specification For.
Shock Tests, H.I. (High-Impact); Shipboard Machinery, Equipment
and Systems, Requirements.
Turbine Fuel, Aviation, Grades JP-4 and JP-5.
Screw Threads, Standard, Optimum Selected Series,
General Specification For.
Anodic Coatings, for Aluminum and Aluminum Alloys.
Crimping Tools, Wire Termination, General Specification For.
Wire, Electrical, Fluoropolymer-Insulated, Copper or Copper Alloy.
Contacts, Electrical Connector, General Specification For.
Adhesive Sealants, Silicone, RTV, Non-corrosive
(for use with Sensitive Metals and Equipment).
Wire, Electrical, Polyimide-Insulated, Copper or Copper Alloy.
MIL-DTL-81381 -
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MIL-DTL-38999K
MIL-I-81969
MIL-I-81969/14
-
-
MIL-C-85049
-
MIL-C-85049/80 -
MIL-C-85049/81-
MS3186
MS27488
MS27496
MS27499
MS27505
MS27508
-
-
-
-
-
-
Installing and Removal Tools, Connector, Electrical Contact,
General Specification For.
Installing and Removal Tools, Connector Electrical Contact, Type III,
Class 2, Composition B.
Connector Accessories, Electrical, General Specification For.
Connector Accessories, Electrical, Dummy Contact, Sizes 12 and 8
Category 7 (For MIL-DTL-38999 Connectors).
Connector Accessories, Electrical, Seal Plug, Size 10 Category 7
(For MIL-DTL-38999 Connectors).
Connector Mounting to Connectors, Mounting Nuts, Plain Hexagon.
Plug, End Seal, Electrical Connector.
Connector, Receptacle, Electrical, Box Mounting, Crimp Type, Bayonet
Coupling, Series I.
Connector, Receptacle, Electrical, Box Mounting Flange, Crimp Type,
Bayonet Coupling, Series II.
Connector, Receptacle, Electrical, Back Panel, Box Mounting Flange,
Crimp Type, Bayonet Coupling, Series I.
Connector, Receptacle, Electrical, Back Panel Box Mounting Flange,
Crimp Type, Bayonet Coupling, Series II.
STANDARDS
FEDERAL
FED-STD-H28
-
Screw-Thread Standards for Federal Services.
DEPARTMENT OF DEFENSE
MIL-STD-202
MIL-STD-790
-
-
Test Methods for Electronic and Electrical Component Parts.
Standard Practice for Established Reliability and High Reliability
Qualified Products List (QPL) Systems for Electrical, Electronic,
and Fiber Optic Parts.
Test Method Standard for Environmental Engineering Considerations
and Laboratory Tests.
Dissimilar Metals.
Marking of Electrical and Electronic Parts.
Test Methods for Electrical Connectors.
Insert Arrangements for MIL-C-38999 and MIL-C-27599 Electrical,
Circular Connectors.
MIL-STD-810
MIL-STD-889
MIL-STD-1285
MIL-STD-1344
MIL-STD-1560
-
-
-
-
-
(See supplement l for list of associated specification sheets and military standards).
(Unless otherwise indicated, copies of the above specifications, standards, and handbooks are available
from the Defense Printing Service Detachment Office, Bldg. 4D (Customer Service), 700 Robbins Avenue,
Philadelphia, PA 19111-5094.)
2.2.2 Other Government documents, drawings, and publications. The following other Government
documents, drawings, and publications form a part of this document to the extent specified herein. Unless
otherwise specified, the issues are those cited in the solicitation.
NATIONAL AERONAUTICAL SPACE ADMINISTRATION (NASA)
NASA Reference Publication 1124 Revised - Outgassing Data for Selecting Spacecraft Materials.-3834.
(Application for copies should be addressed to the Office of Safety and Mission Quality, (code QR),
NASA, Headquarters, Washington, DC 20546.)
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