1、MIL-H-639D 30 September 1986 SUPERSEDING MIL-H-639C 21 April 1969 MILITARY SPEC IF ICATION HOOKS (FOR BELTS, STRAPS, AND EQUIPAGE ITEMS) This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This document covers metal hooks for belts
2、, straps, and equipage items 1.2 Classification. Hooks shall be of the following types, classes, and sizes as specified (see 6.2): Type I - Hook, double, vertical loop Class 1 - Brass wire Class 2 - Steel wire Sizes 1 and 2 (see Drawing 4-1-67) Type II - Hook, double, horizontal loop Class 1 - Brass
3、 wire Class 2 - Steel wire Beneficial comments (recommendations, additions, deletions) and 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 01760-5014, by us ing the se 1 f -ad d r e s
4、 s ed S t andar di za t io n Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC NIA FSC 5340 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited THIS DOCUMENT CONTAINS /y PAGES. Licensed by Information Handling ServicesM
5、IL-H-639D Type III - Hook, hanger, canteen Class 1 - Brass wire Class 2 - Steel wire Type IV - Hook, end, double Class 1 - Brass wire Class 2 - Steel wire Type V - Hook, loop Class 1 - Brass wire Class 2 - Steel wire Type VI - Hook, back strap, with roller, 1 1/4 inch Type VI1 - Hook, side strap, wi
6、th roller, 1 inch Type VI11 - Hook, “S“ Type IX - Hook, end Type X - Hook, stud Class 1 - Brass wire Class 2 - Iron, malleable Type XI - Hook, sliding, 5/8 inch Class 1 - Brass wire Class 2 - Steel Type XII - Hook, “S“ (commercial) Class 1 - Brass wire Sizes A to K (see Drawing 4-1-67) Class 2 - Ste
7、el wire Sizes A to K (see Drawing 4-1-67) 2 6 3 Licensed by Information Handling ServicesO MIL-H-637D 53 m 7977706 0076L5LI b m MIL-H-639D 2. APPLICABLE DOCUMENTS 2.1 Government documents. * 2.1.1 Documents. The following documents form a part of this document to the extent specified herein. Unless
8、otherwise specified, the issues of these documents shall be those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation. 1 4 SPECIFICAT IONS FEDERAL QQ-B-613 QQ-C-3 90 QQ-I -6 6 6 QQ-N-290 QQ -S -69 8 QQ-W-3
9、2 1 QQ-W-461 TT-E -5 29 PPP-B-601 PPP-B -6 3 6 MILITARY MIL-F -4 9 5 STANDARDS MILITARY MIL-STD-105 MIL-STD -1 29 MIL-S TD -14 7 - Brass, Leaded and Nonleaded: Flat Products - Copper Alloy Castings (Including Cast Bar) - Iron Castings, Malleable - Nickel Plating (Electrodeposited) - Steel Sheet and
10、Strip, Low Carbon - Wire, Copper Alloy - Wire, Steel, Carbon (Round, Bare and Coated) - Enamel, Alkyd, Semigloss (Type II) - Boxes, Wood, Cleated-Plywood - Boxes, Shipping, Fiberboard (Plate, Bar, Sheet, and Strip) - Finish, Chemical, Black, for Copper Alloys - Sampling Procedures and Tables for Ins
11、pection - Marking for Shipment and Storage - Palletized Unit Loads by At tributes DRAWINGS U.S. ARMY NATICK RESEARCH, DEVELOPMENT, AND ENGINEERING CENTER 4-1-67 - Hooks, for Belts, Straps and Equipage Items 4-1-68 - Hooks, for Belts, Straps and Equipage Items 3 Licensed by Information Handling Servi
12、cesMIL-H-639D (Copies of documents required by contractors in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting activity.) * 2.2 Other publications. The following documents form a part of this document to the extent spec
13、ified herein. Unless otherwise specified, the issues of the documents which are DOD adopted shall be those listed in the issue of the DODISS specified in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS shall be the issues of the nongovernment documents
14、which are current on the date of the solicitation. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASW) B 633 - Electrodeposited Coatings of Zinc on Iron and Steel D 3951 - Standard Practice for Commercial Packaging (Application for copies should be addressed to the American Society for Testing and Mate
15、rials, 1916 Race Street, Philadelphia, PA 19103.) (Technical society and technical association documents are generally available for reference from libraries. technical groups and using Federal agencies.) They are also distributed among * 2.3 Order of precedence. In the event of conflict between the
16、 text of this document and the references cited herein, the text of this document shall take precedence. Nothing in this document, however, shall supersede applicable laws and regulations unless a specific exemption has been obtained. O 3. REQUIREMENTS 3.1 First article. When specified in the contra
17、ct or purchase order, a sample shall be subject to first article inspection (see 4.3, 6.2, and 6.3). * 3.2 Materials. The specified materials shall conform to the referenced documents specified herein. Recycled material may be used (see 6.4). 362.1 Brass casting. The brass casting shall conform to a
18、lloy No. Al or A3 of QQ-C-390. ! 3.2.2 Brass wire. The brass wire shall conform t alloy No. 260 or 270, three-quarter hard temper as specified in QQ-W-321. 3.2.3 Brass sheet or strip. The brass sheet or strip shall conform to alloy No. 260 or alloy No. 268, half-hard temper of QQ-B-613. 4 Licensed b
19、y Information Handling Services - NIL-H-637D 53 a 9777706 00961i5b T MIL-H-639D 3.2.4 Steel wire. The steel wire shall conform to steel No. 1015 or 1035, finish 1, hard temper of QQ-W-461. 3.2.5 Steel sheet or strip. The steel sheet shall conform to hot rolled commercial quality (HRCQ) or cold rolle
20、d commercial quality (CRCQ) of QQ-S-698. The steel strip shall conform to hot rolled commercial quality or cold rolled half-hard, No. 2 temper of QQ-S-698. 3.2.6 Iron, malleable. The malleable iron castings shall conform to grade I (35018) or grade IG (35018G) of QQ-1-666, except that marking requir
21、ements do not apply. )t 3.2.7 Enamel. The enamel shall conform to TT-E-529. The color shall be r black. 3.3 Construction. The construction of the hooks shall conform to the design, dimensions, and sizes as shown on Drawings 4-1-67 and 4-1-68. 3.3.1 Types I, II, III, IV, V, and XII, class 1 hooks. Th
22、e types I, II, III, IV, V, and XII, class 1 hooks shall be fabricated from material specified in 3.2.2. The type III, class 1 and type V, class 1 hooks shall have the ends joined after forming by brazing. The joint shall be sound and smooth. . 3.3.,2 Types I, II, III, IV, V, and XII, class 2; and ty
23、pes VI11 and IX hooks. The types I, II, III, IV, V, and XII, class 2, and types VI11 and IX hooks shall be fabricated from material specified in 3.2.4, except that for type I, size 2 ohy, the steel number shall be 1035. The type III, class 2, and type V, class 2 hooks shall have the ends joined afte
24、r forming by welding. The welded joints shall be sound and smooth. 3.3.3 Types VI and VI1 hooks. The types VI and VI1 hooks shall be cast from grade I material specified in 3.2.6. 3.3.3.1 Rollers for types VI and VI1 hooks. The rollers for the hooks shall be fabricated from materials specified in 3.
25、2.5. The rollers shall rotate freely, and the butting edges shall be smooth and free from burrs or rough edges. 3.3.4 Type X, class 1 hook. The type X, class 1 hook shall be cast from material specified in 3.2.1. 3.3.5 Type X, class 2 hook. The type X, class 2 hook shall be cast from grade IG materi
26、al specified in 3.2.6. 5 Licensed by Information Handling ServicesMIL-H-6 39D 3.3.6 Type XI, class 1 hook. The type XI, class 1 hook shall be fabricated from material specified in 3.2.3 and to the dimensions specified on Drawing 4-1-68 3.3.7 Type XI, class 2 hook. The type XI, class 2 hook shall be
27、fabricated from material specified in 3.2.5 and to the dimensions specified on Drawing 4-1-68. 3.3.8 Castings. All castings shall be sound and free from pits, blowholes, porosity, fractures, and cracks. The castings shall be smooth and clean prior to application of finish. 3.3.9 Stampings. All fabri
28、cated stampings shall be free from rough and sharp edges before final finish is applied. 3.4 Finish. 3.4.1 Types I, II, III, X, and XI, class 1 hooks. The types I, II, III, X, and XI, class 1 hooks shall be given a black chemical finish and shall show resistance to hot soap solution and resistance t
29、o accelerated weathering in accordance with MIL-F-495 . # 3.4.2 Types I, 11, III, IV, V, X, and XI, class 2; and types VI, VII, VIII and IX hooks. The types I, II, III, IV, V, X, and XI, class 2, and types VI, VII, VIII, and IX hooks shall be given a phosphate-treated zinc plate conforming to type I
30、V, classification Fe/Znl3 Sc 3 of ASTM B 633, followed by baked enamel as specified in 3.2.7. The coating shall level out to a uniform dry film thickness without orange peel, wrinkles, drops, streaks, or areas of no film. 3.4.3 Types IV and V, class 1 hooks. The types IV and V, class 1 hooks shall b
31、e given a bright nickel finish conforming to type V, class 1 of QQ-N-290. Finished hooks shall be buffed and polished. 3.4.4 Type XII, class 1 hooks. “he type XII, class 1 brass hooks shall have a buff bright brass finish. 3.4,s Type XII, class 2 hooks. The type XII, class 2 steel hooks after comple
32、te fabrication shall be galvanized by the hot dip method. galvanizing shall be in accordance with the manufacturers commercial practice, uniformly smooth, adherent, and free from drippings. The . 3.5 Marking. All hooks shall be marked in an inconspicuous location with the manufacturers identificatio
33、n in such a manner that the stamping is not distorted, bent, or malformed. 6 e Licensed by Information Handling Services7 MIL -H-6 3 9D 3.6 Workmanship. All surfaces shall be smooth and free from burrs, slivers, rough or sharp edges, pits, blowholes, porosity, and cracks. 4. QUALITY ASSURANCE PROVIS
34、IONS 4.1 Responsibility 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 purchase order, the contractor may use his own
35、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 this document where such inspections are deemed necessary to assure supplies an
36、d services conform to prescribed requirements. * 4.1.1 Responsibility for compliance. All items must meet all requirements of sections 3 and 5. The inspection set forth in this document shall become a part of the contractors overall inspection system or quality program. The absence of any inspection
37、 requirement in the document 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. known defective material, either indicated or actual, nor does it commit the Governme
38、nt to acceptance of defective material. Sampling in quality conformance does not authorize submission of 4.2 Classifiction of inspections. The inspection requirements specified herein are classified as follows: a. b. First article inspection (see 4.3). Quality conformance inspection (see 4.4). 4.3 F
39、irst article inspection. When a first article is required (see 3.1), it shall be examined for the defects specified in 4.4.3 and 4.4.4. Types I, II, III, X, and XI, class 1 hooks shall be tested for the characteristics specified in 4.4.5. The presence of any defect or failure to pass any test, when
40、applicable, shall be cause for rejection of the first article. 4.4 Quality conformance inspection. Unless otherwise specified, sampling for inspection shall be performed in accordance with MIL-STD-105. 4.4.1 Component and material inspection. In accordance with 4.1, components and materials shall be
41、 inspected in accordance with all the requirements of referenced documents unless otherwise excluded, amended, modified, or qualified in this document or applicable purchase document. Licensed by Information Handling ServicesMIL-H-639D 4.4.2 In-process inspection. Inspection of sub-assemblies shall
42、be made to ascertain that construction details which cannot be examined in the finished product are in accordance with specified requirements. reserves the right to exclude from consideration for acceptance, any material or service for which in-process inspection has indicated nonconformance. The Go
43、vernment . 4.4.2.1 Plating. specified in 3.4.2, prior to application of enamel. Whenever nonconformance is noted, correction shall be made to affected items and process. Examination shall be conducted for application of plating )c 4.4.3 End item visual examination. The end item shall be examined for
44、 the defects listed in table I. The lot size shall be expressed in units of hooks of one type, class, and size. The sample unit shall be one completely fabricated hook. The inspection level shall be II and the acceptable quality level (AQL), expressed in terms of defects per hundred units, shall be
45、2.5 for major defects and 6.5 for total defects. TABLE I. End item visual defects Examine Defect Classification Finish Not smooth Not color specified, when applicable Not clean (i-e., dirt, dust, grease stain, oil, or welding flux embedded in finish) polished peel, wrinkles, drops, streaks, or areas
46、 of no film uniformly smooth, adherent, or free from drippings finished Nickel finish hooks not buffed and Enamel finished hooks have orange Hot dipped galvanized hooks not Type XII, class 1 hooks not bright Construction and Size or design not as specified workmanship Unsound castings (i.e*, porous,
47、 warped, cracked, fractured, or contain blowholes) 8 Major Minor 201 202 2 03 204 2 05 206 207 1 o1 102 Licensed by Information Handling ServicesMIL-H-639D 53 m 9797906 0096360 3 MIL-H-639D TABLE I. End item visual defects Examine Defect Classification Major Minor Construction and workmanship - Stam
48、ping distorted, bent, or malformed 103 continued Rough or sharp edges not removed 104 Weld or braze missing, broken, or not fused, smooth, or sound, where applicable 105 Rollers will not rotate freely 106 Marking Missing, incorrect, incomplete, or illegible 208 4.4.4 End item dimensional examination
49、. The end item shall be examined for the dimensions specified on Drawings 4-1-67 and 4-1-68. The lot size shall be - expressed in units of hooks of one type, class, and size. The sample unit shall be one completely fabricated hook. The inspection level shall be S-2 and the AQL, expressed in terms of defects per hundred units, shall be 4.0. 4.4.5 End item testing. The types I, II, III, X, and XI, class 1 hooks shall be tested for the characteristics in table II. The lot size shall be expressed in units of hooks. The sample unit shall be three hooks, one for each test. The inspection le
