1、A-A-5043LA 47 9999974 0062882 Z li A-A-50431A November 7. 1991 SUPERSEDING March 29, 1990 A-A-50431 COMMERCIAL ITEM DESCRIPTION COUPLINGS - QUICK DISCONNECT, BOWES TYPE (AIR HOSES AND PIPING) The General Services Administration has authorized the use of this commercial item description. This commerc
2、ial item description covers quick-acting, self-locking couplings for pneumatic hose and piping connections where rapid coupling and uncoupling are required: Coupling halves and fittings shall be of the following classes and sizes: Class H.M. - Male coupling half with hose end for 7/16 inch, 1/2 inch
3、, 5/8 inch, 3/4 inch, and 1-1/4 inch hose. Class H.F. - Female coupling half with hose end for 7/16 inch, 1/2 inch, 5/8 inch, 3/4 inch and 1-1/4 inch hose. Class O.M. - Male coupling half with pipe end (external thread) for 7/16 inch through 3/4 inch, or 1-1/4 inch pipe. Class O.F. - Female coupling
4、 half with pipe end (external thread) for 7/16 inch through 3/4 inch, or 1-1/4 inch pipe. Class Y.M. - Y-fitting with one female coupling inlet and two male coupling outlets for 7/16 through 3/4 inch size, or 1-1/4 inch size. Salient characteristics: Materials: Naval brass shall be used for all stru
5、ctural parts except that class Y.M. fittings may be made of cast bronze. retaining clips shall be made of phosphor-bronze. oil resistant molded rubber suitable for compressed air service, Locking springs and Gaskets shall be of AMSC N/A FSC 4730 DISTRIBUTION STATEMENT A. Approved for public release;
6、 distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-l A-A- 50431 A-A-50431iA Y7 E 9999974 00b2883 3 Ri Naval brass shall be in accordance with ASTM Standard B 21, Copper Alloy e UNS No. either C46400 or C48500. Cast bronze sha
7、ll be in accordance with ASTM B 61, Copper Alloy UNS No. C92200. The contractor shall provide a certificate of compliance, signed by the authorized quality representative, that certifies that all materials supplied comply with the purchase,-prder and this commercial item description and its referenc
8、ed standards. Interchangeabilitv: Coupling ends of all coupling halves and fittings for use with 7/16-inch, 1/2-inch, or 5/8-inch hose, as well as for 1/2-inch or 3/4-inch pipe, shall be completely interchangeable, lock effectively and maintain an airtight seal. Coupling ends of all couplings for us
9、e with 1-1/4 inch hose and 1-1/4 inch pipe shall be completely interchangeable, lock effectively and maintain an airtight seal, Where tolerances are not specifically mentioned, a plus or minus tolerance of 0.010 inch will be permitted in all dimensions for which such variations will not affect inter
10、changeability. Coupling Assemblv and Details: Coupling assembly and details shall conform to figure 1. Description of Classes: Class H.M. (fitted with self-locking clutch including spring, spring clip, and clutch-retaining ring) at one end, and a serrated hose shank at the other end, all conforming
11、to figures 1, 2, and 3. The coupling half shall have a male Bowes type coupling half Class H.F. The coupling half shall have a female Bowes type coupling half (fitted with a U-shaped rubber gasket with lip facing hose shank) at one end, and a serrated hose shank at the other end, all conforming to f
12、igures 1, 2, and 3. Class O.M. (fitted with self-locking clutch including spring, spring clip, and clutch-retaining ring) at one end, and the opposite end shall be threaded with American National standard taper pipe threads, all conforming to figures 1, 2, and 3. The coupling half shall have a male
13、Bowes type coupling half Class O.F. The coupling half shall have a female Bowes type coupling half (fitted with a U-shaped rubber gasket with lip facing hose shank) at one end, and the opposite end shall be threaded with American National standard taper pipe threads, all conforming to figures 1, 2,
14、and 3. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. A-A-5043LA 47 9999974 O062884 5 A-A-50431 Class Y.M. The Y-fitting shall have a female Bowes type coupling half (fitted with a U-shaped rubber gasket with lip facing opposite end) at one end,
15、 and two male Bowes type coupling halves (each fitted with self- locking clutch including spring, spring clip, and clutch-retaining ring) at the other end. degrees of arc on each side of the axis of theTemale end, from bar stock, a class Y.M. shall be composed of a branch fitting and two class O.M.
16、male pipe-end coupling halves, properly assembled as shown on figure 3. Alternatively, the fitting may be cast in a single piece. If of one piece construction, the fitting shall be in substan- tial compliance with the essential characteristics shown on figure 3. The male ends shall be located approx
17、imately 30 If machined Markinq: Each coupling half or fitting shall be marked in a plain and permanent manner with the manufacturers name or with a trademark of such known character that the source of manufacture can be readily determined. Workmanship: Exposed surfaces shall be free from projections
18、 which may cause the coupling to unlock when the hose is dragged over uneven surfaces. Couplings shall be machined and free from rough surfaces which might injure the hands of the operator, except that the locking clutch shall be knurled and grooved or otherwise constructed to ensure a firm grip for
19、 the fingers. Oualitv assurance provisions: Responsibilitv for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or order, the c
20、ontractor may use his own or any other facilities suitable for the performance of the inspection requirements specified 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 n
21、ecessary to ensure supplies and services conform to prescribed requirements. Responsibilitv for compliance. All items must meet all requirements herein, The inspection set forth in this specification shall become a part of the contractors overall inspection system or quality program. The absence of
22、any inspection requirements in the specification shall not relieve the contractor of the responsibility of assuring that all products or supplies submitted to the Government for acceptance comply with all requirements of the contract. Sampling in quality conformance does not authorize submiss5on of
23、known defective material, either indicated or actual, nor does it commit the Government to acceptance of defective material. For the purposes of inspection and testing, a lot shall consist of not more than 500 couplings of the same class and size, produced under essentially the same conditions, from
24、 the same lot of raw materials, offered for delivery at one time. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-AbC043LA 47 II 9979974 0062885 7 .?- A-A-50431 A random sample of eight couplings shall be selected from each lot. samples selected
25、shall be subjected to the following tests and examina- tions, and if any sample fails to conform, the lot shall be subject to rejection: The Couplings shall withstand, without leakage or any other indication of failure, a hydrostatic pressure test of 250 pounds per square inch. The compressive force
26、 to operate the couplings shall be 5 to 7 pounds. requirement. Samples shall be measured for compliance with this Samples selected shall be visually and dimensionally examined to verify compliance with this commercial item description. Regulatory requirements. In accordance with section 23.403 of th
27、e Federal Acquisition Regulations, the Governments policy is to acquire items composed of the highest percentage of recovered materials practicable, consistent with maintaining a satisfactory level of competition without adversely affecting performance requirements or exposing the contractors employ
28、ees to undue hazards from the recovered materials. Preservation. packaging. - packing. labeling. and marking. Thepreservation, packaging, packing, labeling, and marking shall be as specified in the contract or order. Notes. Purchaser should specify class and size of coupling halves or fittings requi
29、red. ASTM Standards B 21 and B 61 are available from the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103. MILITARY INTERESTS: CIVIL AGENCY COORDINATING ACTIVITIES: Military Coordinating Activity: GSA-FSS Navy - SH Custodians: Navy - SH Army - AR Preparing activit
30、y: Navy - SH (Proj ect 4730 - 0153) User activities: Navy - M Army - AL FSC 4730 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-.- I- A-A-50431A 47 = 9999974 0062886 9 = I A- A- 50431 RUBBER OPSKET TYPICPL COUPLING ASSEMBCY HosE ENDS SHOWNI a 4693
31、“ c,oo3 It- (HOSEOR PIPE Em NUTS“) R SECTIN Y-Y MPLEHALF (COUPLING END) SECTION X-X -iB* LCC L (HOSE OR PIPE END NOT SHOWN) I FEMALE HALF (COUPLING END) FIGURE 1. Cowling details. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-5043LA 47 E 9999
32、974 0062887 O gl P A-A-50431 Nominal size of hose or pipe (inches) Dimension (inches) A B C D E F G H J K L M N O P Q R S T U V W Z AA BB cc DD EE FF GG - 7/16, 1/2, 5/8, 3/4 1-3/8 1- 7/64 1/8 1-1/8 3/8 15/16 61/64 19/32 1 - 7/64 1/8 9/16 7/64 13/64 1/8 3/4 19/32 Radius 1 - 1/64 1-1/8 1/8 7/64 3/32
33、1/8 23/32 11/32 1/4 25/32 1 - 1/16 1 - 3/8 15/16 1 - 1/4 1-7/8 1 - 3/16 5/32 1 - 5/16 1 - 518 1 - 1/2 7/16 9/16 1 - 9/16 3/16 13/16 5/32 9/3 2 1/8 9/16 1-9/32 Radius 1-37/64 1-5/8 3/16 9/64 1/8 5/32 1 - 1/16 17/32 11/32 1- 5/16 1 - 5/8 1 - 7/8 1 - 5/16 FIGURE 2. List of dimensions. 6 Provided by IHS
34、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,- A-A-50431A 47 9999974 O062888 2 mi A-A- 50431 CLASS H.M. MAE COUPLINO HALF WITH m END CLASS H, F. FEMALE COUPLIHO HALF WITH HOSE END AMERICAN NATIONAL STD, TAPER PIPE THREAD AMERICPN CLASS O, M. MALE COUPLING HALF WITH PIPE END CLASS O, F. FEMALE CWR HALF WITH PF END ON YflTTlNG WITH ONE CoupLNG FEMALE AND HALVES FIGURE 3. Classes. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
