1、MIL-DTL-28804D 10 September 1998SUPERSEDINGMIL-C-28804C 12 April 1991 DETAIL SPECIFICATIONCONNECTORS, PLUG AND RECEPTACLE, ELECTRIC,RECTANGULAR, HIGH DENSITY, POLARIZATION CENTER JACKSCREWGENERAL SPECIFICATION FORThis specification is approved for use by all Departmentsand Agencies of the Department
2、 of Defense.1. SCOPE1.1 Scope. This detail specification covers the general requirements for rectangular electrical connectors, with size 22,nonremovable, solder type contacts, and rear removable crimp type contacts, environment resistant and non-environment, intendedfor use in electronic and electr
3、ical equipment (see 6.1 for restrictions on intended use and application).1.2 Classification.1.2.1 Classes:G - General purpose, nonmagnetic, high density, size 22, rear release, crimp removable contacts.P - Environmental resisting, potting type, nonmagnetic, high density, size 22, rear release, crim
4、p removable contacts.E - Environmental resisting, nonmagnetic, high density, size 22, rear release, crimp removable contacts.S - Solder termination, general purpose, high density, nonremovable, size 22 contacts.SE - Solder termination, interfacial seal, high density, nonremovable, size 22 contacts.1
5、.2.2 Part or Identifying Number (PIN). The PIN shall consist of the letter “M“, the basic number of the specification sheet, andan assigned dash number as shown in the following example:M 28804/1 -1 NMilitary designator Specification Dash Polarizationsheet number number letter(see 3.5.5)2. APPLICABL
6、E DOCUMENTS2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does notinclude documents cited in other sections of this specification or recommended for additional information or as examples. Whileevery effort has been made to ensu
7、re the completeness of this list, document users are cautioned that they must meet all specifiedrequirements 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
8、, standards, and handbooks form a part of thisdocument to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue ofthe Department of Defense Index of Specifications and Standards (DoDISS) and supplement thereto, cited in the solicitation
9、(see6.2).Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use inimproving this document should be addressed to: Defense Supply Center Columbus, ATTN: DSCC-VAI,3990 East Broad Street, Columbus, OH 43216-5000, by using the Standardization Document Impr
10、ovementProposal (DD Form 1426) appearing at the end of this document or by letter.AMSC N/A FSC 5935DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.INCH-POUNDProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-2880
11、4D2SPECIFICATIONSFEDERALQQ-N-290-Nickel Plating (Electrodeposited).DEPARTMENT OF DEFENSEMIL-C-22520 - Crimping Tools, Terminal, Hand, Wire Termination for Wire Barrel Sizes 20 Through 28.MIL-W-22759 - Wire, Electric, Fluoropolymer-Insulated, Copper or Copper Alloy.MIL-L-23699 - Lubricating Oil, Airc
12、raft Turbine Engines, Synthetic Base.MIL-G-45204 - Gold Plating, Electrodeposited.MIL-I-81969 - Installing and Removal Tools Connector Electrical Contact General Specification For.MIL-PRF-87257 - Hydraulic Fluid, Fire Resistant; Low Temperature, Synthetic Hydrocarbon Base, Aircraft and Missile.STAND
13、ARDSMIL-STD-202 - Test Methods for Electronic and Electrical Component Parts.MIL-STD-889 - Dissimilar Metals.MIL-STD-1285 - Marking of Electrical and Electronic Parts.MIL-STD-1344 - Test Methods for Electrical Connectors.MIL-STD-1632 - Insert arrangements for MIL-C-28804 High Density, Rectangular, E
14、lectrical Connectors.MS27488 - Plug, Sealing, Electric Connector.(See supplement 1 for list of associated specification sheets and military standards).(Unless otherwise indicated, copies of federal and military specifications, standards, and handbooks are available from theDefense Printing Service D
15、etachment office, Building 4D, Customer Service, 700 Robbins Avenue, Philadelphia, PA 19111-5094.)2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unlessotherwise specified, the issues of the documents which are DoD adopted are tho
16、se listed the issue of the DoDISS cited in thesolicitation. Unless otherwise specified, the issues of documents not listed in the DoDISS are the issues of the documents cited inthe solicitation (see 6.2).AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME)ASME B46.1 - Surface Texture (Surface Roughness,
17、Waviness, and Lay).AS31971 - Gage Pin for Socket Contact Engagement Test.(Application for copies should be addressed to the American Society of Mechanical Engineers, 11 West 42ndstreet, 13thfloor,New York 10017.)AMERICAN NATIONAL STANDARDS INSTITUTE, INC (ANSI)ANSI/NCSL Z540-1-1994 - Calibration Lab
18、oratories and Measuring and Test Equipment, General Requirements.(Application for copies should be addressed to the American National Standards Institute, Inc. 1430 Broadway, New York, NY10017.)AMERICAN SOCIETY FOR TESTING AND MATERIAL (ASTM)ASTM A 342 - Standard Test Methods for Permeability of Fee
19、bly Magnetic Materials.ASTM B488 - Standard Specification for Electrodeposited Coatings of Gold for Engineering Uses.ASTM B579 - Standard Specification for Electrodeposited Coatings of Tin-Lead Alloy (Solder Paste).ASTM PS 2 - Provisional Standard Specification for Molding Plastics, Electrical, Ther
20、moplastic.(Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia,PA 19103-1187.)Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-28804D3ELECTRONIC INDUSTRIES ASSOCIATION (E
21、IA)EIA-364-56 1987 - Test Procedure No. 56, Resistance to Soldering heat, Test Procedure for Electrical Connectors.(Application for copies should be addressed to the Electronic Industry Association, Engineering Department, 2001 Eye StreetNW, Washington, DC 20006.)(Non-Government standards and other
22、publications are normally available from the organizations that prepare or distribute thedocuments. These documents also may be available in or through libraries or other informational services.)2.4 Order of precedence. In the event of a conflict between the text of this document and the references
23、cited herein (except forrelated associated specifications, specification sheets, or MS sheets), the text of this document takes precedence. Nothing in thisdocument, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.3. REQUIREMENTS3.1 Specification shee
24、ts. The individual item requirements shall be as specified herein and in accordance with the applicablespecification sheet. In the event of any conflict between the requirements of this specification and the specification sheets, thelatter shall govern.3.2 Qualification. Connectors furnished under t
25、his specification shall be products that are authorized by the qualifying activity forlisting on the applicable qualified products list before contract award (see 4.5 and 6.3).3.3 Materials. Example reference materials are identified herein. However, when an example reference material is notidentifi
26、ed, a material shall be used which will enable the connectors, sockets and accessories to meet the performancerequirements of this specification. Acceptance or approval of a constituent material shall not be construed as a guaranty ofacceptance of the finished product.3.3.1 Reference critical interf
27、ace, materials, plating, and processes. The identified reference critical interface materials, plating,and processes have been established to provide assurances that connectors manufactured to this specification will properlyinterface to similar industry standard or government specified connector sy
28、stems without problems of electrochemicalcontamination of critical electrical or mechanical interfaces or generation of incompatible mechanical interface surface wearproducts. The manufacturer of connectors supplied to this specification are allowed to use alternate recognized industry standardmater
29、ials, plating, and processes from those identified in 3.3 of this specification. Alternate materials, plating and processes usedmust be coordinated with the qualifying activity as part of the qualification process. Use of alternates to those referenced guidanceitems by the supplier must not result i
30、n inferior short or long term performance or reliability of supplied connectors as comparedwith connectors manufactured using the referenced materials, plating, or processes. Short or long term failures or reliabilityproblems due to use of these alternates shall be the responsibility of the supplier
31、.3.3.2 Recycled, recovered, or environmentally preferable material. Recycled, recovered, or environmentally preferable materialsshould be used to the maximum extent possible provided that the material meets or exceeds the operational and maintenancerequirements, and promotes economically advantageou
32、s life cycle costs.3.3.3 Dissimilar metals. When dissimilar metals are employed in intimate contact with each other, protection against electrolyticcorrosion shall be provided, for guidance information reference MIL-STD-889.3.3.4 Nonmagnetic materials. All parts used in connectors shall be made from
33、 materials which are classified as nonmagnetic(see 3.6.1).3.3.5 Contact materials. Contacts shall be made of suitably conductive copper based alloys and shall not contain greater than3.5 percent lead content. All contacts shall be suitably protected from corrosion. When contacts are in-process plate
34、d in stripform, the absence of plating in the separation area is acceptable, provided the area is nonfunctional and any corrosion productsformed as a result of salt spray testing (see 4.7.16) does not appear in contact mating or termination area.3.3.6 Electrical contact gold plating guidelines. Elec
35、trical contacts gold plated in accordance with ASTM B488, type 2, code C,.00005 inch (0.0013 mm) minimum thickness.3.3.7 Contact plating (classes G, P, and E). Contacts shall be gold-plated (see 3.3.6), over a suitable underplating (underplatingshall have no silver content), except that the accessor
36、y (hood) on socket contacts shall be suitably protected from corrosion.3.3.8 Contact finish (classes S and SE). The contact finish on the bodies shall be gold applied either overall (see 3.3.8.1) orlocalized (see 3.3.8.2).3.3.8.1 Overall finish. Contacts shall be gold-plated (see 3.3.6).Provided by
37、IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-28804D43.3.8.2 Localized finish. Contact bodies shall be overall nickel plated in accordance with QQ-N-290, except plating thicknessshall be 50 to 150 microinches (1.27 G50m - 3.81 G50m) thick.3.3.8.3 Conta
38、ct mating area. The contact mating area, as shown on figure 1, shall be gold-plated (see 3.3.6).3.3.8.4 Printed wiring tails. Contact wiring tails shall be tin-lead plated in accordance with ASTM B579. Solder dipping shall berequired if stamping leads, providing it meets the procedures and requireme
39、nts of MIL-STD-202, method 208.043 MAX(SEE NOTE 5).030 G72.001 DIA MAX(SIZE 22)AREA “X” (ZONE OF TANGENCY)(SEE NOTE 3)POINT “C” (I.D.) TANGENCY(SEE NOTE 4)SOCKET CONTACT WITH INTEGRAL PRESSURE MEMBER ONLYNOTES:1. Dimensions are in inches.2. Metric equivalents are given for general information only.3
40、. Localized finish: Apply gold to the inside and outside diameter of the contact in area “X“. Measure gold thickness on outside diameter of the contact at point “C“.4. On socket contacts with integral pressure members, area “X“ (zone tangency) extends from the tip of the contact to .020 inch(0.51 mm
41、) beyond a the point of tangency, point “C“ on the outside diameter of the contact.5. Point at which a square-ended pin of the same basic diameter as the mating contact first engages the socket contact spring.FIGURE 1. Contact mating area.3.3.9 Dielectric materials.3.3.10 Insert. Insert materials sh
42、all be thermoplastic polyester in accordance with ASTM PS 2, type GPT-30F.3.3.11 Grommets and interfacial seals. Materials shall be high grade dielectric having hardness, electrical, and mechanicalcharacteristics suitable for the purpose intended.3.3.12 Polarizing and engaging hardware. Polarizing a
43、nd engaging hardware shall be of high grade corrosion resistant materialor a material treated to resist corrosion which allows the complete connector assembly to meet the requirements of thisspecification.3.4 Design, construction, and physical dimensions. Connectors shall be of the design, construct
44、ion and physical dimensionsspecified (see 3.1). Connectors shall be designed so that neither the pins nor the sockets will be damaged during normal mating ofcounterpart connectors.3.4.1 Contact design. Contacts shall be as specified on the individual performance specification sheet (see 3.1 and 3.5.
45、1).3.4.1.1 Printed wiring tails (solder contacts). Printed wiring tails (solder contacts) shall be nonremovable from the insert andshall have solder post terminals as specified (see 3.1).3.5 Critical interface requirements.Inches mm.001.030.0430.030.761.09Provided by IHSNot for ResaleNo reproduction
46、 or networking permitted without license from IHS-,-,-MIL-DTL-28804D53.5.1 Removable contacts. Removable contacts shall be in accordance with M28804/9 and M28804/10. The inserts shall bedesigned to provide positive individual contact retention, and individual contact release from the wire side of th
47、e connector, using anM81969/01-04 tool. The insert design shall permit individual insertion and extraction of contacts without use of a retention ring orremoval of the insert or sealing members. The individual contact retention members shall be surrounded by rigid dielectricmaterial configured so as
48、 to limit their insertion and extraction shall be possible with a full complement of maximum outsidediameter (OD) wire (see table I). Crimp barrels shall be designed to be crimped by a tool conforming to MIL-C-22520/2. Locatorsshall be as specified (see 3.1). For indirect shipment, connectors may be
49、 ordered without contacts (see 6.2).TABLE I. Wire sizes and diameters.Wiresize (AWG)Finished wire OD 1/inch (mm)Minimum Maximum26, 24, 22 .030 (0.76) .054 (1.37)1/ Metric equivalent is for reference purposes only.3.5.2 Insert design and construction. Inserts shall be designed with suitable sections and radii such that they will not readilychip, crack, or break in assembly or in normal service. Inserts shall be molded or bonded one-piece construct
