1、MIL-B-543G 53 7979706 0426225 O w 1 INCH-POUND I MIL-B-543G U Amil 1990 SUPERSEDING MIL-B-543F 23 March 1971 MILITARY SPECIFICATION BUCKLES, TONGUELESS AND WEB STRAP This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specific
2、ation covers metal buckles used on tentage and equipage items. 1.2 Classification. Buckles shall be of the following types, styles, classes, and sizes, as specified (see 6.2): Type I - Buckle, tongueless, 1-Bar Style 2 - (see Drawing 4-1-54) Classes - 1 (brass), 3 (steel), 4 (aluminum) Sizes - 5/8 i
3、nch, 3/4 inch, 1 inch, 1-1/4 inch, 1-1/2 inch Type II - Buckle, tongueless, 2-Bar Style 1 - (see Drawing 4-1-54) Classes - 1 (brass), 3 (steel), 4 (aluminum) Size - 1 inch Class - 1 (brass) Size - 3/4 inch Style 2 - (see Drawing 4-1-54) Beneficial comments (recommendations, additions, deletions) and
4、 any pertinent data which may be of use in improving this document should be addressed to: U.S. Army Natick Research, Development, and Engineering Center, Natick, MA 01960-5014 by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by lette
5、r. AMSC N/A FSC 5340 DISTRIBUTION STA-. Approved for public release; distribution is unlimited. Licensed by Information Handling ServicesMIL-B-543G 53 H 77777Ob 042b22b 2 M MIL-B-543G Style 3 - (see Drawing 4-1-54) Classes - 1 (brass), 3 (steel), 4 (aluminum) Size - 5/8 inch Classes - 1 (brass), 3 (
6、steel), 4 (aluminum) Sizes - 1/2 inch, 5/8 inch, 3/4 inch, 1 inch, 1-1/2 inch, 2 inch Classes - 1 (brass), 3. (steel), 4 (aluminum) Size - 5/8 inch Style 4 - (see Drawing 4-1-54) Style 5 - (see Drawing 4-1-54) Type III - Buckle, double bar, with slide Style 1 - (see Drawing 4-1-171) Classes - 1 (bra
7、ss), 5 (malleable iron) Size - 1-1/2 inch Classes - 1 (brass), 5 (malleable iron) Size - 3/4 inch Classes - 1 (brass), 3 (steel), 4 (aluminum) Sizes - 5/8 inch, 3/4 inch, 1 inch, 1-1/4 inch, 1-1/2 inch Style 2 - (see Drawing 4-1-171) Style 3 - (see Drawing 4-1-171) Type IV - Buckle, single bar, with
8、 lip, cotton webbing Classes - 1 (brass), 3 (steel), 4 (aluminum) Sizes - 5/8 inch, 1 inch Type V - Buckle, quick release, rion-slip, nylon webbing Classes - 3 (steel), 4 (aluminurn) Sizes - 3/4 inch, 1 inch 2. APPLICABLE DOCUMENTS 2,l Government documents. 2.1.1 Specifications, standards, and handb
9、ooks, The following specifica- tions, standards, and handbooks form a part of this document to the extent specified herein, those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.21, Unless otherw
10、ise specified,. the issues of these documents are SPECIFICATIONS FEDERAL QQ-A-250/1 - Aluminum 1100, Plate and Sheet QQ-A-250/11 - Aluminum Alloy 6061, Plate and Sheet QQ-B-613 - Brass, Leaded and Non-Leaded: Flat Products (Plate, Bar, Sheet and Strip) 2 Licensed by Information Handling ServicesI MI
11、L-B-Sq3G 53 = 997790b 042b227 4 QQ-C-390 TT-E-529 TT-P-1757 PPP-B-566 PPP-B-601 PPP-B-636 PPP-B-665 PPP-B-676 MI LI TARY MIL-F-495 MIL-C-5541 MIL-H-6088 STANDARDS MIL I TARY MIL-B-543G - Copper Alloy Castings (Including Cast Bar) - Enamel, Alkyd, Semigloss, Low VOC Content - Primer Coating, Zinc Chr
12、omate, Low-Moisture- - Boxes, Folding, Paperboard - Boxes, Wood, Cleated-Plywood - Boxes, Shipping, Fiberboard - Boxes: Paperboard, Metal Edged and Components - Boxes Setup Sensitivity - Finish, Chemical, Black, For Copper Alloys - Chemical Conversion Coatings on Aluminum and - Heat Treatment of Alu
13、minum Alloys Aluminum Alloys MIL-STD-105 - Sampling Procedures and Tables for Inspection by MIL-STD-129 - Marking for Shipment and Storage MIL-STD-147 - Palletized Unit Loads At t r i bu tes I (Unless otherwise indicated, copies of federal and military specifications standards, and handbooks are ava
14、ilable frcm the Standardization Documents Order Desk, Bldg. 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.) 2.1.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified he
15、rein. Unless otherwise specified, the issues are those cited in the solicitation. DRAN ING S U.S. ARMY NATICK RESEARCH, DEVELOPMENT, AND ENGINEERING CENTER 2-4-71 - Buckles, Quick Release, Non-slip, Nylon Webbing, Type V. 4-1-54 - Buckles, Tongueless and Web Strap; Buckles - 1 Bar, 4-1-171 - Buckles
16、, Tongueless and Web Strap; Buckles, Double Bar, 4-1-202 - Buckles, Tongueless and Web Strap; Buckle Type I - 2 Bar, Type II. With Slide, Type III. (Copies of drawings are available from the U.S. Army Natick Research, Develop- ment, and Engineering Center, ATTN: STRNC-ES, Natick, MA 01760-5014.) 3 L
17、icensed by Information Handling Services2.2 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are DoD adopted are those listed in the issue of the DODISS cited in the solicit
18、ation. Unless otherwise specified, the issues of documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) A 47 - Ferritic Malleable Iron Castings A 109 - Steel, Strip, Carbon,- Cold-Rolled B 183 - Prepar
19、ation of Low-Carbon Steel or Electroplating, Practice for B 322 - Cleaning Metals Prior to Electroplating, Practice -3r B 633 - Electrodeposited Coatings of Zinc on Iron and Steel D 1005 - Measurement of Dry-Film Thickness of Organic Coatings D 3951 - Standard Practice for Commercial Packaging Using
20、 Micrometers (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) (Non-Government standards and other publications are normally available from the organizations that prepare of distribute the documents. These docume
21、nts also may be available in or through libraries or other informational services,) 2.3 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applica
22、ble laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection (see 6.3) in accordance with 4.3. 3.2 Material. The material shall be as specified herein. However, when a defi
23、nite material is not specified, a material shall be used which will enable the buckles to meet the performance requirements of this specification. It is encouraged that recycled material be used when practical as long as it meets the requirements of this specification. 3.2.1 Copper base alloys. 3.2.
24、1.1 Brass Sheet or Strip. Sheet or strip for class 1 buckles shall conform to copper alloy numbers 260 or 268, quarterhard of QQ-B-613. 3.2.1.2 Castings. Brass castings for class 1 buckles shall conform to alloy number C85400 of QQ-C-390. 4 Licensed by Information Handling ServicesMIL-B-543G 53 H 77
25、77906 042b227 B H MI L-B - 5 4 3 G 3.2.2 Steel strip, cold rolled. Cold-rolled steel strip for class 3 buckles shall conform to ASTM A 109. .3 2.3 Aluminum. 3.2.3.1 Alloy 1100. Aluminum alloy for class 4 of types I, II, and III buckles shall conform to 1100, tempers H12 or H24 (UNS A91100) of QQ-A-2
26、50/1. 3.2.3.2 Alloy 6061. Aluminum alloy for class 4 of types I, II, and III buckles shall conform to 6061, temper O (UNS A96061) of QQ-A-250/11. 3.2.4 Malleable iron. Malleable iron for class 5 buckles shall conform to ASTM A 47. 3.3 Construction and dimensions. buckles shall conform to this specif
27、 4-1-171, and 4-1-202, as applicable. The construction and dimensions of the cation and Drawings 2-4-71, 4-1-54, 3.3.1 Type IV and V aluminum buck es. After forming, the type IV and V aluminum buckles shall be heat treatedto temper T-6 conforming to MIL-H-6088. 3.4 Finish. Prior to the application o
28、f a finish, all burrs and sharp edges shall be removed. 3.4.1 Class 1 brass buckles. Class 1 brass buckles shall be given a black chemical finish in accordance with MIL-F-495. 3.4.2 Class 3 steel and class 5 malleable iron buckles. Class 3, steel and class 5 malleable iron buckles shall be given a p
29、hosphate zinc plate treatment conforming to type IV, with a minimum thickness of 13 micrometers; of ASTM B 633, followed by bake enameling. The enamel shall conform to type II of TT-E-529. The color shall be black. The coating shall level out to a uniform dry thickness without peeling, blistering, f
30、laking, streaking, or areas of no E ilm. 3.4.2.1 Class 3 steel and class 5 malleable iron buckles alternate finish. As an alternate to phosphate zinc plate treatment specified in 3.4.2, class 3 steel and class 5 malleable iron buckles may be base plated using an eletrodeposited brass coating as foll
31、ows: a. The base metal shall be cleaned and prepared in accordance with ASTM B 183, ASTM B 242 or ASTM B 322 as applicable. b. The buckle shall then be brass plated to a min inches by eletrodeposition of brass alloy number mum thickness of 0.0004 260 of QQ-B-613. c. The buckle shall then be bake ena
32、meled as spec fied in 3.4.2. 5 Licensed by Information Handling ServicesMIL-B-Sq3G 53 W 777770b 042b230 4 W MIL-B-543G 3.4.3 Class 4 aluminum buckles, Class 4, aluminum buckles shall be prepared for painting as follows: a. All surfaces shall be prepared for painting in accordance with class 1A requi
33、rements of MIL-C-5541. b. The treated surfaces shall be coated with primer conforming to composition G or L, as applicable, color Y of TT-P-1757, c. The primed surface shall be coated with black enamel conforming to type type II of TT-E-529. The coating shall level out to uniform dry thickness witho
34、ut peeling, blistering, flaking, streaking, or areas of no film. 3.4.4 Epoxy powder coating. As an alternate to the finishes specified in 3.4. 1 through 3.4.3 the buckles may be prepared and coated as follows: a, The buckles shall be prepared for coating by mechanical means. The surfaces shall be th
35、oroughly and uniformly textured by sand blasting with 80-grit aluminum oxide. Prepared surfaces shall be kept clean . during subsequent handling, Handling shall be by clean-gloved hands or by clean implements. The surfaces shall be retained in a clean environment. The surface shall be epoxy coated n
36、ot more than 8 hours after sand blasting, b, The finish coating shall be black eletrodeposited powder.coating conforming to H. B. Fuller Company, Kativo Powder No. REP-43286-20 or equal (see 6.5). c. The electrodeposited epoxy powder coating shall be baked in accordance with commercial practice. d.
37、The thickness of the baked coating shall be 0.003 2 0.001 inch when tested as specified in 4,4.4.1. e. The final coating shall be smooth and uniform in appearance, free from wrinkles and streaks. 3.5 Marking for identification. Buckles shall be marked with the manufacturers name or tradename, or tra
38、demark of code of such characters as to be identifiable with the manufacturer, The marking shall be permanently affixed by stamping or etching on the back of the buckle. shall be incorporated in such a manner that the surface opposite those markings shall show no signs of penetratipn or unevenness o
39、r that distortion is not caused on any part of the buckle. The identification marks 3.6 Workmanship. The end item shall conform to the quality of product established by this specification and the occurrence of defects shall not exceed the applicable acceptable quality levels (AQL) . 6 Licensed by In
40、formation Handling ServicesMIL-B-543G 53 a 477770b 042b231 b W MIL-B-543G 4. QUALITY ASSURANCE-PROVISIONS 4.1 3. nl-ess otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements (examinations and tests) as specified herein
41、, 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, unless otherwise disapproved by the Government. The Government reserves the right to perform any of
42、the inspections set forth in this specification where such inspections are deemed necessary to ensure supplies and services conform to the prescribed requirements, 4.1.1 Responsibility for compliance. All items shall meet requirements of sections 3 and 5. The inspection set forth in this specificati
43、on shall become e 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 or supplies submitted to the Government for acceptance comply w
44、ith all 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
45、to accept defective material. 4.1.2 i. Unless otherwise specified in the contract or purchase order, the contractor is responsible for ensuring that all specified dimensions liave been met. When dimensions cannot be examined on the end item, inspection shall be made at any point, or at all points in
46、 the manufacturing process necessary to ensure compliance with all dimensional requirements. 4.2 Classlfi-tionofections. The inspection requirements specified herein are classified as follows: a. b. Quality conformance inspection (see 4.4), First article inspection (see 4.3). 4.3 First article inspe
47、ction. When a first article is required (see 3 6.2), it shall be examined for the defects specified in 4.4.3 and 4.4.4, 4.4 Quality conformance inspection. Unless otherwise specified, camp1 inspection shall he performed in accordance with MIL-STD-105. 1 and ng for 4.4.1 Camponentpection. In accordan
48、ce with 4,1, components and materials shall be inspected in accordance with all the requirements of referenced documents unless otherwise excluded, amended, modified, or qualified in this specification or applicable purchase document. Licensed by Information Handling ServicesI MIL-B-543G 53 W 799970
49、b 042b232 8 W 4.4.2 In-process inspection. Examination shall be made of the following requirements, operations, or assemblies to establish conformance to specified requirements, items affected, the lot in progress, and the operation. Parts which cannot be corrected shall be removed from production. Whenever nonconformance is noted, correction shall be made to the Requirement (when appl icable) Heat treatment Phosphate zinc plating Electrodeposited brass coating Chemical treatment Priming Epoxy powder coating Requirement paragraph 3.3.1 3.4.2 3.4.2.1 3.4.3 3.4.3 3.4.4 4.4.3 End item vis
