1、3-37 -7Yf MIL-C-50703 (MU) 14 December 1970 MILITARY SPECIFICATION CARTRIDGE, 7.62X39MM, BLANK 1. SCOPE 1.1 This specification covers Cartridge, 7.62X39MM, Blank for use in 7.62X39MM weapons for saluting and training. 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issue in effect on date
2、 of invitation for bids or request for proposal form a part of this specification to the extent specified herein. STANDARDS Military MIL-STD- 105 MIL-STD-109 MIL-STD-636 MIL-STD-644 SPECIFICATIONS Military MIL-1-45607 DRAWINGS Munitions Command C117 3 8 7 31 F11731590 - Sampling Procedures and Table
3、s for Inspection - Quality Assurance Terms and Definitions - Visual Inspection Standards for Small Arms Ammunition Through Caliber -50 - Visual InspectionStandards and Inspection Procedures for Inspection of Packaging, Packing and Marking of Small Arms Ammunition by Attributes - Inspection Equipment
4、, Supply and Maintenance of - Cartridge, 7.62X39MM, Blank - Paaking and Marking, Cartridges, 7.62X39MM, Blank: Cartons; Box, Ammunition, M2A1; Box, Wirebound FSC 1305 r- THIS DOWMENT CONTAINS -& PAGES. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
5、MIL-C-50703 13 777770b 033075 4 MIL-C-50703(MU) 2.1 (Contd) PUBLICATIONS Munitions Command AMCR 715-505 - Ammunition Ballistic Acceptance Test Methods Vol. 3 Test Procedures for 7.62mm Cartridges (Copies of specifications, standards, drawings and publications required by suppliers in connection with
6、 specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer,) . 3. REQUIREMENTS 3.1 General.- The cartridge shall comply with the requirements specified on Drawing C11738731, referenced specification, and the following: 3.2 Primer sensitiv
7、ity.- Tho, energy imparted by a 3.94 i .O2 ounce steel ball falling 16 inches shall cause initiation of the primer. imparted by a 3.94 4 .O2 ounce steel ball falling 2.5 inches shall not cause initiation of the primer. The energy 3.3 Residual stress.- The cartridge case shall not split when sub- jec
8、ted to a one percent mercurous nitrate solution for 15 minutes. 3.4 Screen perforation.- The cartridge, when fired, shall not cause perforations of 0.1 inch or greater in diameter in a paper screen, placed in the line of fire at a distance of 15 feet from the muzzle of the weapon. 3.5 Fouling.- The
9、fouling produced by the firing of 510 cartridges shall not cause a decrease in the cyclic rate by more than 15 percent from the first to the last burst. 3.6 Function and casu1ty.- The cartridge shall function without casu1 ty . 3.7 Cyclic rate.- The cartridges shall operate the AK-47 rifle at a cycl
10、ic rate of not less than 475 cartridges per minute. 3.8 Noise level.- The noise level produced by the test cartridges shall be not less than 100 decibels when the noise level of 7.62X39rmn ball production cartridges fired under identical conditions and using the same equipment except for the-use of
11、a blank firing attachment is 120 - 130 decibels. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.9 Workmanship.- The requirements for workmanship are as specified on the applicable drawings, referenced specification, and the following: 3.9.1 Meta
12、l defects.- The cartridge shall be free of folds, wrinkles, deep draw scratches, scaly metal, dents and other defects. 3.9.2 Foreign matter.- The cartridge shall be free of corrosion, stains, discolorations, dirt, oil, and smears of lacquer. 4, QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for ins
13、pection,- Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. specified in the contract or order, the supplier may use his own or any other facilities suitable for the performance of the ins
14、pection requirements speci- fied herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. Except as
15、otherwise 4.1.1 Quality assurance terms and definitions.- Reference shall be made to MIL-STD-109 for definition of quality assurance terms. 4.2 First article sample. 4.2.1 Initial production sample.- At the beginning of regular production, a sample shall be submitted in accordance with contract requ
16、irements and shall consist of 2500 blank cartridges and 500 primed cartridge cases. shall be manufactured using the same materials, equipment, processes and pro- cedures as will be used in regular production. including packaging and packing, shall be the same as used for regular pro- duction and sha
17、ll be obtained from the same source of supply. The sample Ail parts and materials, 4.2.1.1 Examination and test.- After inspection and provisional acceptance at source, the sample shall be inspected for all requirements of the drawings and specifications at a government laboratory or such other faci
18、lity specified in the contract. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-C-50703 13 II 7777906 0330077 & : MIL-C-507C3 (MU) 4,2.1.2 Initial production sample failure.- Failure of the samp to comply with requirement-s of the drawings ,and
19、 gpecifications shall result in sample disapproval. sample shall be based upon results of initial tests only, and no second tests shall be permitted on that initial production sample. Determination as to acceptability of any initial production 4.3 Inspection provisions. -. 4.3.1 Lot, 4.3.1.1 Submiss
20、ion of product.- The product shall be submitted in accordance with MIL-STD-105. 4.3.1.2 Lot identification.- Each lot of ammunition shall be identified as to type, caliber and model as well as with a lot number, as assigned by the procuring activity. Number assigned by the procuring activity. Each l
21、ot shall be further identified by a Federal Stock 4.3.2 Examination.- Examination for major and minor defects shall be per- formed on a class basis in accordance with the classificationof defects, Table I, using applicable sampling plans and acceptance criteria of Standard MXL- STD-105. percent and
22、the AQL for the minor class shall be 2.50 percent. The Acceptable Quality Level (AQL) for the major class shall be 0.65 4.3.2.1 Classification of defects.- The classification of defects shall be as specified in Table I. TABLE I NO - 1 2 4 5 6 7 8 10 12 13 14 Defect and Method of Inspection Visual i/
23、 Discolored, dirty, oily, smeared Corroded or stained, if etched Round head Dent Split 2/ Perforation Draw scratch Beveled underside of head Scaly metal No chamfer on head (rim) Fold Major Minor X X X X X x X X X X X 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without lice
24、nse from IHS-,-,-4.3.2.1 Table I (Contd) NO. Defect and Method of Inspection Visual &/ - Major Minor 18 19 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 - i! Presence of head stamp Defective head No primer Cocked primer Inverted primer Loose primer Nicked or dented primer No waterpr
25、oofing material (primer pocket Defective primer crimp Missing or loose wad Opening between wad and case wall Wad and joint between neck and wad not completely covered by lacquer joint) Gaging Total length Cartridge profile failure (requlring more than 20 pounds dead weight to insert in profile and a
26、lignment gage) X X X Diameter of extractor groove, max. Diameter of extractor groove, min. Diameter of head, max. Diameter of head, min. Thickness of head Length to shoulder datum Diameter of mouth, min. Diameter of mouth, max. X X Depth of primer X X X X X X X X X X X X X X X X Refer to MIL-STD-636
27、 for visual standards for defects 1 through 38, except defect No. 18. While no photographs of blank cartridges are included in this Standard, the cartridge case defects illustrated in the NATO 7.62mm section can be used. specification and MIL-STD-636 as to defect classification, the classifi- cation
28、 specified in Table I shall apply. In the event of conflict between Table I of this 5 -. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-50703 (MU) 4.3.2 1 (Cont d) i 21 A split shall be classed as a major defect regardless of location or occur
29、rence of loss of propellant, 4.3.3 Tests.- The tests listed in Table II shall be conducted in accord- ance with the methods and procedures specified in 4.4. 4,3.3.1 Test samples.- The quantities for the,various tests shall be as specified in Table II. sional requirements shall be used in the ballist
30、ic tests, and shall have been selected in such a manner that the sample is representative of the entire lot. The cartridges selected shall be thoroughly mixed before being divided into samples for the various tests. Only cartridges having met the visual and dimen- TABLE II Test - Primer sensitivity
31、Al Residual stress (mercurous Screen perforation 31 Fouling &/ Function and Casulty - 51 Cyclic rate 61 Noise level 31 nitrate 21 Number of Cartridges Ambient Temperature Requirement Para. 50 2 10 5 10 600 30 3.2 3.3 3.4 3.5 3.6 3.7 3.8 - i/ Prior to assembly into cartridges, a sample of primers fro
32、m each primer lot shall be inserted into cartridge cases and tested for sensitivity. The cartridge cases for this test shall be taken from regular production, The test sample shall consist of the number of primed cartridge cases required for performance of a complete run-down test wherein fifty prim
33、ers are tested at each height. If the average critical height (H) plus five standard deviations (5 sigma) exceeds 16 inches, or if the average critical height (H) minus two standard deviations (2 sigma) is less than 2.5 inches, the lot of primers shall be rejected subject to performance of a second
34、complete run-down test wherein one-hundred primers are tested at each height. criteria shall be cause for rejection of the lot of primers. Failure of the second sample to comply with the above 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-5
35、0703 (MU) 4.3.3.1 (Contd) Failure of two or more cartridges to comply with the applicable require- ment shall be cause for rejection of the lot. If one cartridge fails in the first test, a second sample consisting of double the number of cartridges in the first sample shall be tested. are found in t
36、he second sample, the lot shall be rejected. - 2/ If any failing cartridges - 31 Failure of eight or more cartridges to comply with the applicable require- ment shall be cause for rejection of the lot. than eight cartridges fail in the first test, a second sample consisting of double the number of c
37、artridges in the first sample shall be testad, The lot shall be rejected if, in the combined first and second sample, eight or more cartridges fail to comply with the applicable requirement. If more than three, but less - 41 This test shall be conducted on the initial production sample only. & 51 Th
38、e lot shall be rejected when function and casulty defects plus all other firing defects exceed the acceptance number for the cumulative sample in Table III. exceeds the acceptance number for the first sample but is equal to or less than the acceptance number for the cumulative sample, a second sampl
39、e consisting of double the quantity specified under function and casulty test shall be fired in the service weapon specified therefor. procedure shall apply regardless of the weapon or weapons in which the firing defects occurred in the first tests, defects in the combined first and second sample ex
40、ceeds the acceptance number for the cumulative sample, the lot shall be rejected. If, in testing a second sample, defects other than those for which the second sample is being tested should occur to the extent that they exceed the acceptance number for the cumulative sample, the lot shall be rejecte
41、d, If the number of defects found in the first test This If the total number of The cyclic rate shall be determined during the firing of the function and casulty test. ment shall be cause for rejection of the lot subject to the testing of a second sample consisting of double ehe number of cartridges
42、 in the first sample, applicable requirement shall be cause for rejection of the lot, Failure of any burst to comply with the applicable require- Failure of any burst in the second sample to comply with the 4.3.3.2 Firing defects.- Firing defects and acceptance numbers shall be as specified in Table
43、 III. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-50703 (MU) 4.3.3.2 (Contd) TABLE III Def ec ta 1, Primer a. b. Escape of gas through or around primer cup Blown primer or primer falls out of pocket on retraction of bolt 2, Case Bulges, m
44、outh or neck Splits, neck, shoulder or mouth Splits, body Splits, through head Complete rupture Partial rupture Detached metal L/ 3, Weapon stoppage A/ 4, Misfire Acceptance Numbers Cumulative (First Sample) (First & Second Samples) 12 32 O 1 12 12 4 1 O 4 O 12 32 32 10 2 1 10 1 32 3 8 11 Any partic
45、le of metal which becomes separated from the case between the mouth and the juncture of the shoulder and neck shall be classified as detached metal. - 2/ All stoppages attributable to the ammunition, with the exception of misfire or complete rupture observed in all tests shall be included. 4.3.4 Pac
46、kaging, packing and marking inspection,- During or immediately prior to the packaging operation, 100% examination of the cartridges shall be performed to ascertain that the cartridge type conforms to the drawing. Occurrence of another model blank cartridge or a dummy cartridge shall be classed as a
47、major defect. be classed as a critical defect, Inspection for packaging, packing and marking shall be in accordance with MIL- STD-644 as applicable to the drawing, Occurrence of any type other than those listed shall All nonconforming cartridges shall be rejected. 8 Provided by IHSNot for ResaleNo r
48、eproduction or networking permitted without license from IHS-,-,-4.3.5 Inspection equipment.- Except as otherwise provided for by the contract, the contractor shall supply and maintain inspection equipment in accordance with the applicable requirements of MIL-1-45607. 4.4 Test methods and procedure2
49、 4.4.1 Primer sensitivity.- The primers shall be inserted into the cartridge cases to the depth specified on Drawing C11738731 in accordance with AMCR 715-505, Volume 3. The test shall be conducted 4.4.2 Residual stress (mercurous nitrate).- Test shall be conducted in accordance with AMCR 715-505, Volume 3. 4.4.3 Screen perforati%.- The test shall be conducted in accordance with AMCR 715-5059 Vol. 3. 4.4.4 Fouling.
