1、.1 5. MIL-C-L757D 13 7777706 0483523 7 - I INCH-POUND I MIGC-l8757D(OS) 19 June 1991 SUPERSEDING 15 April 1981 MIL-C-l8757C(OS) MILITARY SPECIFICATION CARTRIDGE CASES, STEEL (OTHER THAN SMALL ARMS) GENERAL SPECIFICATION FOR is speccation is approved for use by the Naval Sea Systems Command, Departme
2、nt of the Navy, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the general requirements for 20 millimeter (mm) and larger (other than small arms) steel cartridge cases. Specific requirements for a particular calibe
3、r, Mk and Mod steel cartridge case, are covered by the applicable detail specifications (see 6.11). 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standards. The following specifications and standards form a part of this document to the extent specified herein. Unless oth
4、erwise 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). 0 STANDARDS MILITARY MIL-STD-105 Sampling Procedures and Tables for Inspection by Att
5、ributes I 1 Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commanding Officer, Naval Ordnance Station, Standardization Branch (Code 3730), Indian Head, MD 20640-5000 by using the Standardizatio
6、n Document Improvement Proposal (DD Form 1426) appearing at the end of this document or sending a letter. AMSC N/A FSC 1395 DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. Licensed by Information Handling ServicesProvided by IHSNot for ResaleNo reproduction or netwo
7、rking permitted without license from IHS-,-,-MIL-STD- 129 Marking for Shipment and Storage MIL-STD- 1 167 Ammunition Data Card MIL-STD-1168 Ammunition Lot Numbering DOD-STD-2101 Classification of Characteristics (unless otherwise indicated, copies of federal and military specifications and standards
8、 are available from: Standardization Documents Order Desk, Bldg. 4D, 700 Rabbins Avenue, Philadelphia, PA 191 1 l-SO94.) 2.2 Non-Government publicritions. The following documents form a part of this document to the extent specified herein, Unless otherwise specified, the issues of the documents whic
9、h are DOD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwisespecified, the issues of documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). AMERICAN SOCIETY POR TESTING AND MATERIALS (ASTM) ASTM B 117 Salt
10、Spray (Fog) Testing, Standard Test Method of OD adopted) ASTM B487 Measurement of Metal and Oxide Coating Thickness by Microscopical Examination of a Cross Section, Standard Test Method for OD adopted) ASTM B499 Measurement of Coating Thicknesses by the Magnetic Method: Nonmagnetic Coatings on Magne
11、tic Basis Metals, Standard Test Method for OD adopted) ASTM E8 Tension Testing of Metallic Materials, Standard Test Methods of OD adopted) ASTM E18 Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials, Standard Test Methods for OD adopted) (Application for copies should be addre
12、ssed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103-1187). NATIONAL RAILROAD FREIGHT COMMITIEE Uniform Freight Classification (UFC) 6000 (Application for copies should be addressed to the National Railroad Freight Committee, 222 South Riverside Plaza, Sui
13、te 1120, Chicago, IL 60606-5945,) (Non-Government standards and other publications are normally available from the organizations that prepare or distribute the documents, These documents also may be availabie in or through libraries or other informational services.) 2 Provided by IHSNot for ResaleNo
14、 reproduction or networking permitted without license from IHS-,-,-. P MIL-C-1875D 13 9999906 0483525 O 4 MIGC-l8757D(OS) 2,3 Order of Precedence. In the event of a conflict between the text of this document and the references cited herein (except for related associated detail specifications), the t
15、ext of this document takes precedence. Nthing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 0 3. REQUIREMENTS 3,l Associated detail specifications. The individual item requirements shall be as specified herein and in accordance w
16、ith the applicable detail specifications (see 6.2). In the event of any conflict between the requirements of this specification and the associated detail specification, the latter shall govern. 3.2 Rrst article. When specified (see 6.2), a sample shall be subjected to first article inspection (see 6
17、.4) in accordance with 4.5. 3.3 Material. The material used in the manufacture of steel cartridge cases shall be in accordance with the applicable detail specification and drawings. 3.4 Design. The design of each cartridge case shall be in accordance with the design requirements specified in the app
18、licable detail specification and drawings. 3.5 Chambering (M101). Each cartridge case shall fully chamber in the appropriate Navy approved cartridge case body gage specified in the applicable detail specification (see 4.7.2). 3.6 Heat treatment. The cartridge case shall be overall heat treated to ob
19、tain the hardness, yield strength, and elongation values specified in the applicable detail specification. 3.7 Hardness. Cartridge case hardness shall be in accordance with the applicable detail specification (see 4.7.3). 3;s Elongation. The cartridge case shall meet the elongation requirements spec
20、ified in the applicable detail specification (see 4.7.4). 3.9 Tension (M102). The cartridge cases shall meet the yield strength requirements specified in the applicable detail specification (see 4.7.5). 3.10 Protective coating (M103). Unless otherwise specified in the contract or purchase order (see
21、 6.2), the protective coating shall be specified on the applicable detail specification with the following exceptions: the exterior thickness shall be between 0.0003 inch and 0.0008 inch. The interior plating thickness shall be 0.00015 inch minimum, except thinner plating at the inert standoff conta
22、ct points shall be acceptable. The protective coating shall show no corrosion of basis metal. The size and frequency of the black corrosion products of zinc shall not exceed that of the established standard as specified in the appropriate detail specification. After testing, white corrosion products
23、 of zinc that do not interfere with chambering of the cartridge case shall be acceptable (see 4.7.6). . 3.11 Ballistics (M104). The cartridge case shall meet the ballistic requirements specified in the applicable detail specification (see 4.7.7). 3 Provided by IHSNot for ResaleNo reproduction or net
24、working permitted without license from IHS-,-,-3.11.1 Case extraction (M105). Cartridge cases tested under automatic and semiautomatic action shall be ejected and shall in no way cause the weapon to cease firing, When fired in the single shot mode, the cartridge case shall be capable of being extrac
25、ted by manual operation of the extraction system. (NOTE: The term “ejected“ means that the cartridge case is thrown clear of the breech, permitting loading of the subsequent round, The term “extract“ means that the cartridge case is loosened and pulled to the rar, by the nomai operation of the extra
26、ction system, sufficiently to permit ready removal.) 3.11.2 Case rechambering. All cartridge cases fired at service pressure in single-shot action shall be capable of being rechambered by hand in the gun in which they were fired. The case shall seat and the breech shall fully close. 3.12 Item identl
27、ficatlon. Item identification marking of all cartridge cases shall be in accordance with the contract or purchase order (see 6.2) and the applicable documentation (see 5.2). 3.15 Workmanship C-1 (MlS). The cartridge case shall be produced in such a manner as to ensure compliance with all the require
28、ments of this specification and the applicable detail specification. There shall be no burrs, cracks, tears or other imperfections of manufacture, which in the opinion of the Government inspector, may adversely affect either the assembly, functioning or handling of the product. (Flutes, draw marks,
29、loopers, slug marks, and pits shall not exceed 10 percent of the calculated wall thickness in the affected area nor be of sufficient magnitude to cause minimum or maximum dimensions to be exceeded, (NOTE: Grain orientation directionality is produced by rolling. A looper is a visible pattern of this
30、grain orientation extended by drawing,) There shall be no flutes, pitting, draw marks or loopers in the region between the base and a circumferential line 3 inches from the base of the cartridge case,) The only acceptable surface defects on the interior base-to-wall radius are those exemplified by t
31、he sample board approved by the contracting activity. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection, Unless otherwise specified in the contract or purchase order, the contractor is responsible or the performance of ail inspection requirements (examinations and tests) as specified
32、 herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unIess disapproved by the Government. The Government reserves the right to perform any of the
33、 inspections set forth in this specification where such inspections are deemed necessary to ensure supplies and services conform to prescribed requirements. 4.1.1 Respansihility far compliance. All items shall meet all requirements of sections 3 and 5. The inspection set forh in this specification s
34、hall become a part of the contractors overall inspection system or quality program. The absence of any inspection requirements in the specification shall not relieve the contractor of the responsibility of ensuring that all products oc supplies submitted to the Government for acceptance comply with
35、ail requirements of the contract, Sampling inspection, as part of manufacturing operations, is an acceptable practice to ascertain conformance to requirements, however, this does not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to ac
36、cept defective material. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. 5 I b MIL-C-L757D 13 9999906 0483527 4 0 4.2 Classification of inspections. The inspection requirements specified herein are classified as follows: a. First article inspecti
37、on (see 4.5) b. Quality conformance inspection (see 4.6) 4.3 Classification of characteristics. The requirements verified by the tests and examinations specified herein are classified as critical, major or minor in accordance with DOD-STD-2101. Tests and examinations that verify critical characteris
38、tics are identified by the symbol (C), and major characteristics by the symbol (M). The number following the classification symbol indicates the serial number of the characteristics. Requirements not annotated with a classification code are classified as minor. 4.4 Sampling. Unless otherwise specifi
39、ed in the detail specification or contract (see 6.2), the Government inspector shall use sampling plans and procedures conforming to the provisions of MIL-STD-105 in the determination of acceptability of steel cartridge cases submitted by the contractor for Government inspection and testing. 4.4.1 F
40、irst article sample. The first article sample shall consist of the quantity of cartridge cases as specified in the applicable detail specification. 4.4.2 Production lot. The production lot shall consist of cartridge cases of all the same size, mark, mod and caliber. The production lot shall be manuf
41、actured under the same conditions using the process resulting from the approval of the first article sample and submitted for Government acceptance at one time. The formation of lots shall be as defined in MIL-STD-105. 0 4.4.2.1 Lot size. The quantity of cartridge cases in a production lot shall be
42、as specified in the applicable detail specification. The production lot shall consist of the quantity of cartridge cases specified in the detail specification plus the sample cartridge cases selected for inspection and tests. Unless otherwise specified in the contract or purchase order (see 6.2), al
43、l cartridge cases submitted for inspection and test purposes shall be provided at the expense of the contractor . 4.5 First article inspection. First article inspection shall consist of the examinations and tests specified in table I. Sampling and acceptance shall be in accordance with table I. 4.6
44、Quality conformance inspection. Quality conformance inspection shall consist of the examinations and tests specified in table I. Sampling and acceptance shall be in accordance with table I. 4.7 Tests. 4.7.1 Inspection of materials. The cartridge cases shall be visually inspected for conformance to 3
45、.3. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIGC-187571) (OS) TABLE I, First article sample and auality conformance inspection and samding, Tat or examination Dimensional Chamber gaga Hardness Ellongation Tension Protcctiva coating a, Thick
46、ncas b, Corrosion Ballistio case oxtraction Packaging and marking Workmanship 3.4 3s 3,l 3.8 3.9 3.10 3.11 section 5 3.13 - Method Jaragraph - 4.1.8 4.1.2 47.3 4.1.4 4.7.5 4.7,6 4.7.1 4.8 4.1.8 - First article sample inspection qumbcr of units Numbcr of defects to be inspected allowed I Acccpt Rejcc
47、t 158 O 1 158 O 1 4 O 1 See applicable detai specification See appiicable detaii apcoification 4 O 1 3 O 1 See applicable dctaii specification i58 O 1. 158 o 1 Quality conformance inspection to be inspected aiiowe See applicable dcta specification lO% AU defectiva ca8c shall be rejcctcd MILSTD-105 A
48、QL = 2.5% Inspectian Level s-1 See applicable detail specification Sec applicable detail specification 5 O 1 3 O Sf See appiicablc detail specification MIGSTD-105 AQL = 1.0% Inspection Leuel s-3 100% All defective we shali be rejected 1 Nonconformace of one sample to meet the corrosion code requirem
49、ents ahaU requb testhg of an additional 3 8ampIa. FaUum of any of tho additional samples of ma the corrosion cade requirement shaU be ause for rejection of the lot. 47.2 Chamber gage examination. Each cartridge case shall be chamber gaged as specified in the applicable detail specification to determine conformance to the requirements of 3.5. 4,7,3 Hrirdness, Cartridge cases shall be prepared and tested ia accordance with ASTM El& to determine conformance to 3.7
