1、29 June i955 SUPERSEDING O.S. 1509 C 30 DECERIBER 1946 MILITARY SPECIFICATION CARTRIDGE CASE, BRASS 8-INCH MARK 1 MOD 3 (55 CALIBER) 1. SCOPE 1.1 Scope.- This specification covers the-detail require- ments for the 8-inch Mark 1 Mod 3 (55 caliber) brass cartridge cases - 2, APPLICABLE DOCUMENTS 2.1,
2、The following specification, standard, and drawing of the issue in effect on date af invitation for bids, form a part of this specification: SPECIFICATION MILITARY MIL-C-18738 - Cartridge Cases, Brass (Other than Small ArmsIGeneral Specification for. STANDARD MILITARY MIL-STD-105 - Sampling Procedur
3、es and Tables for Inspectioa by Attributes, Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-c-O (Nord) DRAWING BUREAU OF ORDNANCE 517763 - Cartridge Case -Inch Mk MO (55 Cal.) (Copies of specifications, standards and drawings required by contract
4、ors in connection with specific procurement functions should be qbtained from the procuring activity or as directed by the contracting officer.) 3. REQUIREMENTS 3.1 General, 3.1-1 Requirements for pilot lot, means and methods of manu- facture, records, material, grain structure, and stress relief sh
5、all be i-n complete accordance with Specification 1-18738. 3.1.2 Requirements for machining, measurements, tolerances and allowances, weight, surface roughness, and item identifica- tion marking for each cartridge case shall be as specified on Drawing No. 517763 and in Speeification MIL-C-18738. 3.2
6、 Design.- The design requirements of each,cartridge case shall conform to Drawing No. 517763. 3.3 Hardness.- Hardness determinations and values shall con- form to Table I and shall be taken in the teat regions shown on Figure 1. Table. I - Hardness Values1 - Region A Region B Region C Region D Regio
7、n E Min. Min. Min, Max. Min, Max, Min, Max. 70 43 40 70 31 70 31 49 L $Rockwell 30-T . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-18760 13 m 777770b 0277824 T m Fig. 1 - Cartridge Case 3.4 Screw threads.- Screw threads shall conform to Dxa
8、wing No. 517763 and Specification MIL-C-18738. 3.5 Performance.- Cartridge cases shall conform to the per- formance requirements of Specification MIL-C-18738. tion, they show no defects under service firing that are detri- mental to service. In addi- 3.6 Workmanship.- Workmanship shall be such as to
9、 produce a 4 uniform product in accordance with the requirements of this- specification, Drawing No. 517763, -and Specification MIL-C-18738. 4. 4.1 Lots. 4.1.1 Pilot Lots.- Pilot lot requirements shall be in ac- cordance with Specification MIL-C-18738 and in quantities as specified in Table II. _ QU
10、ALITY ASSURANCE PROVISIONS AND TEST REQUIREMENTS - 4.1.2 Production lot.- Production lot requirements shall be in accordance with Specification MIL-C-18738 and in quan- tities as specified in Table II. 4.2 Sampling. 4.2.1 For inspection.- Sampling procedures for production lot inspection shall be in
11、 accordance with Specification MIL- C-18738 and Standard MIL-STD-105. .-. - .- :r 2. - 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-18760 (Nord) 4,2.2 For test,- Sampling for pilot lot acceptance and pro- duction lot acceptance shall be in
12、 the quantities as shown in Table II. TABLE II - Lot and sample sizes * Sample Cases for for for Quai it y Lot Ballistic Metallurgical Strain Total Type of Lot Size Test examina t ion Test Pilot -_- 20 3 2 25 Production 1,000 3 3 1 1,007 4.3 Inspection.- Inspection procedures shall conform to Spec-
13、fication MIL-C-18738. The inspection sampling level, acceptable quality level (AQL), and classification of defects shall be as specified by the procuring activity. 4.4 Test. 4,4.1 General.- General test procedures shall conform to _. Specification MIL-C-18738 4.4.2 Hardness test.- The number of samp
14、le cartridge cas-s listed in Table II for metallurgical. examination shall be checked for hardness to determine conformance to-the requirements of 3.3. A sufficient number of hardness determinations shall be made on two quadrants of each cartridge case so as to represent ade- quately the hardness of
15、 the regions shown on Figure 1. 4.4.2.1 Hardness test procedures.- Hardness test procedures A suitable method shall conform to Specification MI-C=l8738. for determining the hardness values of cartridge cases is to take hardness readings on each of two sections cut longitudinally from each cartridge
16、case. rical plane of the case is coincident with the longitudinal cen- terline of the cut section. The cuts shall be made such that the diamet- 4.4,3 Strain test.- The number 0% sample cartridge cases listed in Table II for strain test shall be tested and checked for cracks and splits in accordance
17、with requirements of Spec- f icaqion MIL-C-18738 I I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-18760 13 9779706 0277826 3 m MIL-C-18760 (Nord) t 4.4.3.1 Strain test procedures.- The procedures for strain testing cartridge cases shall conf
18、orm to Specification MIL-C-18738. No mouth or primer plug shall be required in the strain test. 4.4.4 Ballistic test.- The number of cartridge cases listed in Table II for ballistic test shall be fired in quantities a-& specified in Table III to determine conformance to 3.5. Table III - Ballistic te
19、st samples Service Pressure Proof Pressure Type of Lot (No. of rounds) (No. of rounds) Pilot 16 4 1 IProduction I 2 I 1 I 4.4.4.1 Ballistic test procedures.- The procedure for bal- listic testing cartridge cases shall be in accordance with Specification MIL-C-18738 4.5 Rejected lots.- Rejections, re
20、tests, and the disposition of defective cartridge case lots shall be. in accordance with Specif fcation XIL-C-18738 5. PREPARATION FOR DELIVERY 5.1 Packaging and Packing.- 5.1.1 For domestic shipment.- Unless otherwise specified in the contract or order (see 6.2) cartridge cases shall be pre- pared
21、for domestic shipment in accordance with the preparation for delivery requirements of Specification MIL-C-18738 addition, cartridge cases shall be packaged in such a manner that each case is separated from its adjacent case and from the shipping container by soaid fiberboard dividers. In 5.1.2 For o
22、verseasshipment.- Overseas shipments of car- tridge cases shall be prepared for delivery in accordance with the requirements of the procuring activity, as specified in the contract or order (see 6.2). 5.2 Marking of shipments.- Unless otherwise specified in the Contract or order (see 6.2), shipments shall be marked in- accordance with Specification MIL-C-18738 . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
