1、Comments, suggestions, or questions on this document should be addressed to DLA Aviation VEB, 8000 Jefferson Davis Highway, Richmond, VA 23297-5616, or e-mailed to STDZNMGTdla.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST
2、database at https:/assist.daps.dla.mil/. AMSC N/A FSC 5940 INCH-POUND MIL-DTL-24558B 3 October 2011 SUPERSEDING MIL-DTL-24558A 17 February 2006 DETAIL SPECIFICATION TERMINAL BOXES, CONNECTION, FOR ELECTRICAL AND ELECTRONIC SYSTEMS, GENERAL SPECIFICATION FOR This specification is approved for use by
3、all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the general requirements for terminal connection boxes for electrical and electronic systems. 1.2 Classification. The terminal connection boxes are of the symbol numbers specified in the individu
4、al specification sheets (see 6.2 and 6.4.2). 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 informat
5、ion 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 of the documents cited in sections 3 and 4 of this specification, whether or not they are listed. Provided by IHSNot for ResaleNo
6、reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24558B 2 2.2 Government documents. 2.2.1 Specifications, standards, and handbook. The following specifications, standards, and handbook form a part of this document to the extent specified herein. Unless otherwise specified, t
7、he issues of these documents are those cited in the solicitation or contract. FEDERAL STANDARDS FED-STD-595/17875 - Miscellaneous, Gloss FED-STD-595/17886 - Miscellaneous, Gloss FED-STD-595/17925 - Miscellaneous, Gloss FED-STD-595/21105 - Red, Semigloss FED-STD-H28 - Screw-Thread Standards for Feder
8、al Services FED-STD-H28/2 - Screw-Thread Standards for Federal Services Section 2 Unified Inch Screw Threads - UN and UNR Thread Forms COMMERCIAL ITEM DESCRIPTION A-A-59125 - Terminal Boards, Molded, Barrier Screw and Stud Types and Associated Accessories DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-S-9
9、01 - Shock Tests, H.I. (High-Impact) Shipboard Machinery, Equipment, and Systems, Requirements for MIL-DTL-15024 - Plates, Tags, and Bands for Identification of Equipment, General Specification for MIL-P-15024/5 - Plates, Identification MIL-E-24142 - Enclosures for Electrical Fittings and Fixtures,
10、General Specification for MIL-PRF-24712 - Coatings, Powder (Metric) (See Supplement 1 for list of specification sheets.) DEPARTMENT OF DEFENSE STANDARDS MIL-STD-108 - Definitions of and Basic Requirements for Enclosures for Electric and Electronic Equipment MIL-STD-167-1 - Mechanical Vibrations of S
11、hipboard Equipment (Type I - Environmental and Type II - Internally Excited) MIL-STD-202 - Electronic and Electrical Component Parts Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24558B 3 DEPARTMENT OF DEFENSE HANDBOOK MIL-HDBK-454 - Genera
12、l Guidelines for Electronic Equipment (Copies of these documents are available online at https:/assist.daps.dla.mil/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.3 Non-government publications. The following documents form a part of
13、 this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. AEROSPACE INDUSTRIES ASSOCIATION NASM45938 - Nut, Plain, Clinch and Nut, Self-Locking, Clinch General Specification for (Copies of this document a
14、re available at http:/www.aia-aerospace.org/ or from Aerospace Industries Association, 1000 Wilson Boulevard, Suite 1700, Arlington, VA 22209-3928.) ASTM INTERNATIONAL ASTM B36/B36M - Standard Specification for Brass Plate, Sheet, Strip, and Rolled Bar ASTM B139/B139M - Standard Specification for Ph
15、osphor Bronze Rod, Bar, and Shapes ASTM B152/B152M - Standard Specification for Copper Sheet, Strip, Plate, and Rolled Bar ASTM D5948 - Standard Specification for Molding Compounds, Thermosetting (Copies of these documents are available at http:/www.astm.org/ or from ASTM International, 100 Barr Har
16、bor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959.) AMERICAN SOCIETY FOR QUALITY (ASQ) ASQ Z1.4 - Sampling Procedures and Tables for Inspection by Attributes (Copies of this document are available online at http:/www.asq.org/ or from American Society of Quality, 600 North Plankinton Avenue,
17、 Milwaukee, WI 53203.) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24558B 4 MASTER PAINTERS INSTITUTE (MPI) MPI #48 - Interior Alkyd, Gloss (MPI Gloss Level 6) (Copies of this document are available at http:/www.specifypaint.us/ or from t
18、he Painting & Decorating Contractors of America - National Office (PDCA), 3913 Old Lee Highway, Suite 33-B, Fairfax, VA 22030-2433.) 2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein
19、 (except for related specification 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 Specification sheets. The individual item requirements shall be as
20、specified herein and in accordance with the applicable specification sheet. In the event of any conflict between the requirements of this specification and the specification sheet, the latter shall govern. 3.2 First article. Prior to beginning production, a first article sample consisting of one ter
21、minal connection box manufactured using production tooling and processes shall be inspected as specified in 4.3. Test results in the first article report shall show the exact data value of each inspection test and examination. (See 6.2 and 6.3.) 3.3 Materials. Materials shall be as specified herein
22、and in accordance with the applicable specification sheets. 3.3.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the operational and
23、maintenance requirements, and promotes economically advantageous life cycle costs. 3.3.2 Metals. Metals shall be corrosion-resistant. Copper, brass, and phosphor bronze materials shall be in accordance with ASTM B152/B152M, ASTM B36/B36M, and ASTM B139/B139M, respectively. Metal parts susceptible to
24、 stress-corrosion cracking shall be stress relieved (see 3.4.3.3 and 6.4.1). 3.3.3 Non-metallic materials. Non-metallic materials shall be fungus-inert. Guideline 4 of MIL-HDBK-454 may be used as guidance for the identification of non-metallic materials that are not a nutrient to fungi. Plastic mate
25、rials shall be in accordance with ASTM D5948. Adequate measures shall be taken in molding or processing plastics to ensure that stress build-up does not occur or is satisfactorily treated to relieve these stresses to prevent deterioration or failure of a part or assembly. The stress-relieving proces
26、s shall be as required by the technical data furnished by the supplier of the raw material. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24558B 5 3.3.4 Hardware. Unless otherwise specified in the applicable specification sheet, all hardwar
27、e (bolts, nuts, screws, washers, press-fit fasteners, and miscellaneous hardware) shall be of good commercial grade material compatible with that of the basic fixture. Unless otherwise specified in the applicable specification sheet, stainless steel hardware may be substituted for steel hardware. 3.
28、4 Design and construction. 3.4.1 Electrical rating. The electrical rating shall be as specified in the applicable specification sheet. 3.4.2 Wire terminating facilities. Wire terminating facilities shall be as specified in the applicable specification sheet. 3.4.3 Enclosure. The enclosure shall be a
29、s specified in the applicable specification sheet. 3.4.3.1 Submersible. Submersible (15-foot) enclosures shall be in accordance with MIL-E-24142 and as specified herein. 3.4.3.2 Watertight. Watertight enclosures shall be as specified in the applicable specification sheet. 3.4.3.3 Stress relief. Meta
30、l enclosures shall be stress relieved and marked in accordance with MIL-E-24142. 3.4.3.4 Cleaning. The enclosure shall be furnished thoroughly cleaned of all brazing and welding flux and other corrosive agents. Cleaning agent shall be neutralized after cleaning. 3.4.3.5 Finish. Unless otherwise spec
31、ified in the applicable specification sheet, the interior of the enclosures (covers optional) shall be primed and shall be painted using white enamel that complies with MPI #48. Unless otherwise specified (see 6.2), the exterior of the enclosures shall not be primed or painted. 3.4.3.6 Alternate fin
32、ish. If specified (see 6.2), the interior of the terminal connection boxes may be finished with a powder coating in accordance with MIL-PRF-24712. Powder coating finish shall be gloss white in accordance with one of the following color numbers: a. FED-STD-595/17875 b. FED-STD-595/17886 c. FED-STD-59
33、5/17925 3.4.4 Terminals. Terminal boards shall be in accordance with A-A-59125 and of the type specified in the applicable specification sheet. Terminal lug assemblies and terminal lug bases shall be as specified in the applicable specification sheet. Provided by IHSNot for ResaleNo reproduction or
34、networking permitted without license from IHS-,-,-MIL-DTL-24558B 6 3.4.4.1 Mounting brackets. Unless otherwise specified (see 6.2), the terminal board mounting brackets and pads shall be of brass and shall be as shown on figures 1 through 5. Mounting bracket and pad installation shall be as specifie
35、d in the applicable specification sheet. 3.4.4.2 Alternate mounting bracket. If specified (see 6.2), an alternate type terminal board mounting bracket that utilizes stainless steel press-fit type fasteners with self-locking clinch nuts in accordance with NASM45938 may be used in place of the typical
36、 brass barrel nuts that are typically brazed into the bracket. 3.4.5 Threaded parts. Threads for all threaded fastening devices shall conform to FED-STD-H28 and FED-STD-H28/2. The threads shall be right hand, coarse thread series, unified thread form, class 2A or 2B, or American National thread form
37、, class 2. Other thread series and classes, such as fine thread, may be used where it is necessary to assure functional operation of the equipment. Threads shall be checked during production with go-no go gages to insure conformance to FED-STD-H28 and FED-STD-H28/2. 3.4.6 Gaskets. Cover sealing gask
38、ets shall be furnished and installed in accordance with MIL-E-24142. 3.4.7 Brazing and welding. Brazing and welding shall be in accordance with best commercial practices and performed in a manner that will pass all required tests. Gas tungsten arc welding is an acceptable alternate to brazing. 3.4.8
39、 Dimensions and tolerances. Dimensions shall be as shown in the applicable specification sheet. Unless otherwise specified in the applicable specification sheet, the following tolerances shall apply: a. Decimal dimensions - 0.016 inch. b. Angular dimensions - 0.25 degree. Unless otherwise specified
40、in the applicable specification sheet, a tolerance of 0.031 inch is acceptable on decimal dimensions that are controlled by brazing or welding provided that this wider tolerance will not interfere with the interchangeability of assemblies or parts. 3.4.9 Drilling, countersinking, and tapping. All dr
41、illing, countersinking, and tapping shall be completed before plating or finish is applied. Tapped holes that are used for normal replacement of parts shall be countersunk. 3.4.10 Sharp edges. All sharp edges and corners shall be given a slight radius. Provided by IHSNot for ResaleNo reproduction or
42、 networking permitted without license from IHS-,-,-MIL-DTL-24558B 7 3.5 Designation and marking. 3.5.1 Equipment identification plates. Identification plates shall conform to types A, B, or C of MIL-DTL-15024 and to the requirements for normal service of MIL-P-15024/5. Material, marking, and install
43、ation shall be as shown on figure 6 and as specified in the applicable specification sheet. As an option, identification marking may be molded (plastic enclosures only), engraved, or stamped directly on the covers of the enclosures to provide a permanent identification. Marking shall not be located
44、on gasketed surfaces of covers. 3.5.1.1 Filling. Filling of stamped, engraved, or molded marking with paint is not required. 3.5.1.2 Sharp edges. Sharp edges of plates shall be removed and corners shall be given a slight radius. 3.5.1.3 Enclosure manufacturer. The enclosure manufacturer, if other th
45、an the terminal connection box supplier, shall be identified by appropriate marking on the interior surface of the cover. 3.5.2 Information plates. Unless otherwise specified (see 6.2), information plates shall be as specified in 3.5.1 except that they shall be blank. The option of molding, depressi
46、ng, or embossing the inscriptions or markings on the cover is not applicable for information plates. 3.5.3 Warning plates. Warning plates shall be as specified in the applicable specification sheet. Material shall be brass. Depressed lettering shall be filled in with red enamel in accordance with FE
47、D-STD-595/21105. The face of warning plates shall not be primed or painted. Warning plates shall be brazed on the cover as shown in the applicable specification sheet. All sharp edges and corners shall be given a slight radius. 3.6 Workmanship. The workmanship shall be in accordance with 3.6.1 throu
48、gh 3.6.5. 3.6.1 Mounting of parts. Parts or hardware shall be assembled and secured or mounted in the specified manner to satisfactorily accomplish the purpose for which intended. Equipment having missing, inoperative, defective, bent, broken, or otherwise damaged parts will not be acceptable. 3.6.2
49、 Cleaning. After fabrication, and prior to assembly in the terminal connection boxes, parts shall be cleaned of smudges, weld metal, metal chips, and mold release agents or any other foreign material that might impair the intended operation, function, or appearance of the terminal connection boxes. All corrosive material shall be removed. All assembled terminal connection boxes shall be cleaned of contaminants su
