1、 i MILs-3139 28 FEBRUARY 1950 SUPERSEDING ARMY-5-21-38A 31 DECEMBER 1947 MILITARY SPECIFICATION SHELL, FIXED, CHEMICAL, M64 FOR 75-MM. GUNS, M312 FOR 76-MM. GUNS, M313 FOR 90-MM. GUNS, AND SHELL, SEMIFIXED, CHEMICAL, M64 FOR 75-MM. HOWITZERS, M60 FOR 105-RIM. HOWITZERS, ASSEMBLING, MARKING, AND PACK
2、ING This specification wa8 approved by the Departments oj the. Amty, the Nauy, and the Air Force for u8e of prowremmt eervke8 of the respeotiue Departments 1. SCOPE 1.1 Scope;-This specification covers as- sembling, marking, and packing of fixed chem- ical shell for 75-, 76-, and 90-mm. guns and sem
3、ifixed chemical shell for 75- and 105-mm. howitzers. 2. APPLICABLE SPECIFICATIONS AND DRAWINGS 2.1 Specifications. - Specifications refer- enced on the applicable drawings (see 2.2), of the issue in effect on date of invitation for bids, form a part of this specification. 23 Drawingix-The following
4、drawings, and all drawings referenced thereon, of the is- sue in effect on date of invitation for bids, form a part of this specification : . ORDNANCE DEPARTMENT DRAWINQS 75-1-108-Shel1, Semifixed, Smoke, FS, M60, Dualgran, w/fuze, PD, M5iA5, 0.05 Sec, Delay, for 105-mm. Howitzeh, M2A1 and M4. 75-1-
5、109-Shell, Semifixed, Gas, Persist- ent, H, M60, Dualgran, w/fuze, PD, M5lA5, 0.05 Sec. Delay, for 105-mm. Howitzers, M2A1 and M4. 7!%1-110-Shell, Semifixed, Smoke, WP, M60, Dualgran, w/fuze, PD, M51A5, 0.05 Sec. Delay,-for 105-mm. Howitzers, .-e M2Ai and M4. * 75-1-1ll-Shell, Fixed, Smoke, WP, M64,
6、 w/fuze, PD, M48A3,0.05 Sec. Delay, for 7b-m. Gw. ,. . .- 7b1-114-Shel1, Semifixed, Smoke, m, M64, w/fuze, PD, M4883,0.05 Sec. De- lay, for.75-mm. Howitzers. 75-1-116-Shell, Semifixed, Smoke, FS, M64, w/fuze, PD, M48A3,0.05 Sec. De- lay, for 75-mm. Howitzers. 76-1-2Mhel1, Fixed, Smoke, WP, M313, Smo
7、keless, w/fuze, PD, M48A3,0.05 Sec. Delay, for 90-mm. Guns, M1, MlAl; M2, M2A1, M3, M3A1, and T8. 75-1-227-Shell, Fixed, Smoke, WP, M312, Flashless-Smokeless, w/fuze, PD, M48A3, 0.05 Sec. Delay, for 76-mm. Guns. (Uopies of specilcations and drawings should be ob- tained from theprocurlng agency or a
8、s directed by that agency. Both the title and identifying number or symbol shonid be stipulated when requesting copies.) 3. REQUIREMENTS 3.1 Materials.-Materials and parts shall meet all requirements specified on applicable drawings and in applicable specifications. 3.2 Rotating band.-The rotating b
9、and of the projectile shall not be damaged, for ex- ample, nicked or burred. 3.3 Painting and marking.-The painting and markings shall be restored by the as- sembling contractor on any components fur- nished to him painted and marked, when such painting and mar+ have been marred or obliterated. 3.4
10、Propelling charge (rounds for guns only). 3.4.1 Rounds for 7i-nm. gum.-The weight of the propelling charge shall not differ by more Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I MIL-S-3337 33 777790b 0273750 / MILS4139 than 3.0.03 ounce avoirdupo
11、is from that desig- nated by the loading authorization for the par- ticular lot of powder used. 3.42 Rods for 76-mm. guna.-The weight of the propelling charge shall not differ by more than IO.05 ounce avoirdupois from that desig- nated by the loading authorization for the par- . ticular lot of powde
12、r used. 3.4.3 Rounds for 00-mm. gum.-The weight of the propelling charge shall not differ by more than IO.09 ounce avoirdupois from that desig- nated by the loading authorization for the par- 3.4.4 Weighifig of churge.-The contractor shall weigh and checkweigh each propelling . charge. The checkweig
13、hing shall be accom- . . plished by an operator working independently of the original weigher, using a different scale from that used to make the first weighing. (See 3.4.4.) . (See 3.4.4.) - ticular lot of powder used. (See 3.4.4,) 3.5 Crimp. 3.5.1 Round8 for 75- -and 76-rnm. gzms.- Cartridge cases
14、 shall not separate from the shell at a load of less than 1,800-pounds. 3.56 Rounds for 90mm. guns.-Cartridge cases shall not separate from the shell at a load . - of less than 5,000 pounds. * 3.6 Proving ground test. . 3.6.1 Average we1odty.-The difference be- tween the velocities of any two rounds
15、 fired in the velocity test shall not exceed 3 percent of the mean velocity of all the rounds fired in this phase of the test. The average vel9city shall not differ from the prescribed velocity by more than 3.2 percent after reducing results to stand- ard conditions. 3.6.2 Premature bursts. - No pre
16、mature bursts or evidence thereof shall occur. 3.6.3 Xh1.J functioning.-In any ballistic sample fired, not more than one shell shall fail to function satisfactorily. 3.7 Workmanship.-All parts shall be fres from chips, dirt, grease, and other foreign mate- rial. The cleaning method used shall not be
17、 injurious to any of the parts nor shall the parts be contaminated by the cleaning agents used. 4. SAMPLING, INSPECTION, AND TEST PSOCEDURES -: I r - 4.1 Roundlots. * -4.1.1 Lot and same specification and specication revision. 4.1.2.2.2 Burster charges from not more than two lots or two grand lots (
18、if grand lot assign- ments have been made for the item), These lots should be consecutive lots if possible (not a requirement). 4.1.2.2.3 Burster initiators from not more than two lots or .two grand lots (if grand lot assignments have been made for the item). These lots should be consecutive lots if
19、 possible (not a requirement). 4.16.3 Loaded fiizes from not more than two lots or two grand lots (if grand lot kign- ments have been made for the item). These loh should be consecutive lots if possible (not a requirement). 4.1.2.4 Loaded primers from not more than two lots or two grand lots (if gra
20、nd lot assign- ments have been made for the item). These lots should be consecutive lots if possible (not a requirement). 4.1.2.5 Propellent powder of the same lot. 4.2 Sampling.-Samples shall be uniformly 42.1 Select 10 samples for test of crimping 4.2.2 Select 20 sample rounds for proving 4.3 Insp
21、ection. 4.3.1 Rounds for gw and howitzers.-Tn- spection shall be as specified in Specification 50-0-1. 4.3.2 Gaging (rouds for guns) .-After the round has been assembled, the contractor shall gage each roiind of: ammunition iii a profile nnd alinement gage (commonly known as a chamber gage) pertaini
22、ng to this round. If the round fails to enter the profile and aliiiement gnge freely, it shall be rejected siibject to correction and retest. Drawings of tle Goveriimeiit pro- selected from each round lot as follows: case to shell. (See 4.4.) ground tests. (See 4.5.) Provided by IHSNot for ResaleNo
23、reproduction or networking permitted without license from IHS-,-,-.MIL-S-3337 33 7797706 0273753 T I file and alinement gage will be furnished to the contractor for his information upon applica- 4.4 Test of crimping case to shell (rounds for 75-, 76-, and 90-mm. guns).-Sample rounds selected as pres
24、cribed in 4.2.1 shall be tested as follows : 4.4.1 Procedure.-Use a tensile testing ma- chine satisfactory to the inspector. Determine the security of the crimp of the cartridge case to the shell by applying a load in the axial di- rection. Rate of travel of testing machine head shall be 0.100 to 0.
25、125 inch per minute inclusive. 4.4.2 Acceptance.-The lot will be consid- ered a example : cartridge cnse, loaded percussion primer, propelling charge, loaded shell, loaded fuze, and loaded burster initiator, all properly assembled. 6.2 Tests.-When the contractor for the round is also the contractor
26、for one or more of the compoiieiits thereof, the proving ground tests of the components may be combined mith the proving ground test of the round to save expense upon agreement between the United States Government and- the contractor to that effect. In case the round specification-does not . cover a
27、11 of the proving ground tests specified for the components, the additional tests pre- scribed in the component specifications will be conducted. 6.3 P re m a t u r e burst.-A “premature burst” is defined as a functioning of the shell in the gun bore or in flight before impact. Notice.-This specific
28、ation, together with specica- tions and drawings pertaining to it and bearing a “No- tice” of similar restrictions, 1s intended for use only in connection with procurement by the United States Gov- ernment; and shall not be reproduced either wholly or in part except when authorized in connection wit
29、h Government pimxxement nor be used for any other purpose except when specifically authorized by the Chief of Ordnance. Custodian: Army-rdnance Department. . o QU. & QOVRNm PPMTIG OPPICE i 1061 O - 931195 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
