1、DOD-N-63548 53 M 7797706 0307533 4 17 March- 1982 MILITARY SPECIFICATION NUT, PLAIN, HEXAGON, WHEEL MOUNTING, METRIC GENERAL SPECIFICATION FOR This specification is approved for use by all Departments and Agencies of the Department of Defense. I. SCOPE 1.1 Scope. “his specification covers metrically
2、 dimensioned steel hexagon plain wheel mounting nuts. 2. APPLICABLE DOCUMENTS 2.1 Government docments. 21.1 SDecifications. standards. and handbooks. IJnless otherwise specified, the following specifications, standards, and handbooks of the issue listed in that issue of the Department of Defense Ind
3、ex of Specifications and Standards (DoDISS) specified in the solicitation form a part- of this specification to the extent specified herein. SPEC1 FICATIONS FEDERAL QGP-416 - Plating, Cadmium (Electrodeposited) 82-2-325 - Zinc Coating, (Electrodeposited), Requirements for PPP-H-1581 - Hardware (Fast
4、eners and Related Items), Packaging of MILITARY MIL-1-6868 - Inspection Process, Magnetic Particle DOD-N-6?548/1 - Nut, Plain, Hexagon, Cone Seat, Wheel Mounting, Metric Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document
5、should be addressed to: Commander, US Army Armament Research and Development Command, ATTN: DRDAR-TST-S, Dover, NJ 07801 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. FSC 5310 - . M Provided by IHSNot for
6、ResaleNo reproduction or networking permitted without license from IHS-,-,-Doh N- 6 35 4 8 STANDARDS FEDERAL FED-STD-H28/21 - Screw-Thread Standards for Federal Services, Section 21, FED- STD-66 - Steel: Chemical Composition and Hardenability Metric Screw Threads MILITARY MILSTD-lOS - Sampling Proce
7、dures and Tables for Inspection by MILSTD-l30 - Identification Marking of US Military Property MIGSTD-I312 - Fasteners, Test Methods Attributes (Copies of specifications, standards, handbooks, drawings, and publications required by manufacturers in connection with specific acquisition functions shou
8、ld be obtained from the contracting activity or as directed by the contracting officer.) 2.2 Other ublications. The following documents form a part of this specification to the extent specified herein. which are indicated as DoD adopted shall be the issue listed in the current DoDISS and the supplem
9、ent thereto, if applicable. The issues of the documents AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM A 563M - Standard Specification for Carbon and Alloy Steel Nuts (Application for copies should be addressed to the American Society for SOCIETY OF AUTOMOTIVE ENGINEERS (SAE) HANDEOOK Testin
10、g and Materials, I9 i6 Race Street, Philadelphia, PA i9 103. ) SAE J122a - Surface Discontinuities of Nuts (Application for copies should be addressed to the Society of Automotive ( Industry association specifications and standards are generally available Engineers, Inc., 400 Commonwealth Drive, War
11、rendale, PA for reference from libraries. and using Federal agencies. ) 2.3 Order of precedence. In the event of a conflict between the text of this specification and the references other than specification sheets cited herein, the text of this specification shall take precedence. 15096.) They are a
12、lso distributed among technical groups 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-N-b35q 53 m 7797706 0307535 B m DOD- N-6 3 5 4 8 3. REQUIREMENTS 3.i Secification sheets. The individual item requirements shall be as specified herein and i
13、n accordance with the applicable specification sheet. the event of any conflict between requirements of this specification and the specification sheet, the latter shall govern. 3.2 Material. extent practicable. In Recycled and reclaimed materials shali be used to the maximum L 3.2.1 Carbon steel. Th
14、e nuts shall be made of carbon steel in accordance with FED-STD-66 composition i151 or ASTM A 563M property class 9. 3.3 Hardness. Nut hardness shall not exceed 30HRC. 3.4 Pyotective finish. Protective finishes shall be as follows: 3.4.1 Cadmium Dlatinq. Nuts shall be cadmium plated in accordance wi
15、th QQ-P-416, type II, class 2 (7.6 pm thick). 3.4.2 Zinc coatinq. Nuts shall be zinc coated in accordance with QQ-Z-325, type II, class 2 (13 pm thick). 3.4.3 Hvdronen embrittlement. Cadmium plated carbon steel nuts shall be subjected to an embrittlement relief treatment within four hours after plat
16、ing in accordance with QGP-416. 3.5 Desinn. 3.5.1 a Ihreads. Nut threads shall conforni to the llM1l profile, tolerance class 6H, as defined in FEbSTbH28/21. 3.5.2 Concentricitv. The thread axis shall be concentric with axis of the nut body within a tolerance equal to 3 percent for all hexagon nuts.
17、 3.6 Dimensions. Dimensions and tolerances shall be in accordance with the ? applicable specification sheet (see 3.1) and as specified herein. t 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-WD-N-62548 c Thread- size M12 M20 Proof load, kN (min)
18、80 225 84.3 245 Stress area (mm ) (nom) Proof load stress (ma) (min) 950 920 2 3.7 Discontinuities. The depth of discontinuities such as laps, seams and inclusions in the nuts shall be no greater than 3 percent of the nominal thread size. The length of discontinuities shall not exceed the height of
19、the nut. M22 279 303 920 ?,.7.l Cracks. Quenched cracks are not permitted in any location. Forging cracks located in the top and bottom face are permitted provtded: no more than two forging cracks extend from the thread across the full width of the face; no forging crack extends into the thread beyo
20、nd the first full thread; and the width of any forging crack does not exceed 0.20 mm plus O.OID, where D is the nominal nut thread size in mm. Forging cracks located at the intersection of the top or bottom face with a flat are permitted provided that the width does not exceed 0.25 mm plus 0.020D, w
21、here D is the nominal nut thread size in mm, The depth of forging cracks shall be not greater than 3 percent of the nominal nut thread size in mn. 3.8 Proof load. Nuts shall withstand the proof loads specified in table I without rupture of metal or thread stripping. nuts shall be manually removeable
22、 from a mating bolt or mandrel without. assistance of a tool except for the initial one-half turn of the nut, Upon removal of the proof load, 3.10 Workmanship. Finished nuts shall be uniform in quality and appearance. Surfaces shall be free of foreign matter, burrs, loose scale and any other defects
23、 which may adversely affect serviceability. 4 0 QUALITY ASSURANCE PROVISIONS . 4.1 Resmnsibilitv for inspection. Unless otherwise specified in the Except as otherwise contract or purchase order, the contractor is responsible for the performance of all inspection requirements as specified herein. spe
24、cified 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 disapproved by the Government. Government reserves the right to perform any of the inspections set forth in the specif
25、ication where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. The 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I 1. i DOD-N-635LI8 53 7777906 0309537 3 I DOL N- 6 35 4 8 4.2 Classificatio
26、n of insDections. The inspections specified herein are classified as follows: a. Material inspection (see 4.4) b. Quality conformance inspection (see 4.5) 4.3 InsDection conditions. Unless otherwise specified, all inspections shall be performed at ambient temperature, humidity and atmospheric pressu
27、re. 4.4 Material insDection. Material inspection shall consist of certification supported by verifying data that materials used in fabricating nuts are in accordance with 3.2 prior to such fabrication. as specified in table II. 4.5 uialitv conformance insmction. Quality conformance inspection shall
28、be TABLE II. ualitv conformance insDection. Inspection Design Dimensions Worhnship Group B Discontinuities Hardness Proof load Requirement paragraph 3 -5 3 06 3.10 3 -7 3.3 3 .a Test method paragraph 4.6.1 4.6.1 4.6.1 4.6 .I ,4.6.3 4.6.2 4.6.4 4.5.1 Insmction lot. An inspection lot shall consist of
29、completed nuts covered by a single specification sheet, produced under essentially the same conditions, and offered for inspection st one time. rework it to correct the defects, or screen out the defective units, and resubmit for reinspection. inspection. Such lots shall be separate from new lots, a
30、nd shall be clearly identified as reinspected lots. inspection level S-3 of MIL-STD-105 with an acceptable quality level (AQL) of 2.5 percent defective for major defects. For minor defects, inspection level S-3 and an AQL of 4.0 percent defective shall apply. 4.5.2 Re-iected lots. If an inspection l
31、ot is rejected, the contractor may Resubmitted lots shall be inspected using tightened 4.5.3 SamDlinR for moup A insDection. Sampling shall be in accordance with 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4,5.4 SamDlinP: for grow B inswctioq,
32、.Samples for tests shall be selected fkm lots which have been visually and dimensionally examined and accepted, Sampling shall be in accordance with MILSTD-105 with inspection level and AQL as follows: r - Ca tego ry Defect Critical None defined - -iuP _u- Major 101 1 O3 Evidence of cracks, laps, se
33、ams, inclusions 104 Minor 20 1 202 203 Threads not as specified (see 3.5.1) Pilot dimensions and concentricity not as specified (see 3.7) (see 3.5.2, 3.6) -LI. *UiIM - -p. - - Nut thickness not as specified (see 3.6) Other dimensions not as specified (see 3.6) Workmanship not as specified (see 3 . 1
34、0) Test InsDection level a Discontinuities (mgnetic particle) s-4 Proof load s-4 Hardness 2-2 1.5 1 05 4 .O 4,5.5 TnsDection of packasinrz,. The sampling and inspection of the preservation, packing, and container marking shall be in accordance with the requirements of PPP-H- 158 1 . 4.6 Methods of i
35、nspection. 4.6.1 Ekamination. Samples taken as specified in 4.5.3 and 4,5,4 shall be thoroughly examined to determine conformance with this specification and applicable specification sheet. Examination shall be conducted in accordance with table III. Inspection method SIE i/ Visual and SIE I SIE SIE
36、 SIE Visual J/ Standard inspection equipment. 4.6.2 Hardness. When specified (see 6,2), sample nuts taken as specified in 4.5.4 shall be tested for hardness in accordance with MILSTD-1312, test method 6. I 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IH
37、S-,-,-I DOD-N-63548 53 9979906 0307539 5 = A Thread size (m) M12 M20 M22 DOD-N-63548 B C min (m) (d 12.050+.110 12 20.065+ . 130 20 22.065+ . 1 30 22 4.6.3 Discontinuities. When specified (see 6.21, sample nuts taken as specified in 4.5.4 shall be subjected to magnetic particle inspection in accorda
38、nce with MILI-6868 for conformance to 3.7. samples with seams or potentially deep forging cracks shall be subjected to the cone proof load test of SAE J122a. When specified (see 6.2), 4.6.4 Proof load. Samples taken as specified in 4.5.4 shall be mounted on a mandrel in accordance with figure 1, and
39、 loaded as specified in 3.8, table I. Mandrel hardness shall be QSHRC, minimum, and threads shall be class 5hhg in accordance with FED-STD-H28/21, except that the maximum major diameter shall be the minimum major diameter plus 0.25 times the class 68; tolerance range. lhe nut shall withstand the spe
40、cified load, applied axially and in tension, without - rupture or stripping. I * I 3 I. I DIMENSIONS I FIGURE 1. Fixture for DWO f load test. 5. PACKAGING 5.1 Packasina reauirements. ?he requirements for packaging shall be in 6. NOTES accordance with PPP-H-1581 (see 6.2) 1 6.1 intended use. Wheel mo
41、unting nuts are intended for mounting wheel rims on automotive vehicles such as automobiles and trucks. 6.2 &derina data. Acquisition documents should specify the following: a. Title, number and date of this specification and the applicable specification sheet. b. Applicable specification sheet part
42、 number (see 3.1) c. Tests if required (see 4.6.2, 4.6.3) d. Level (degree) of protection in accordance with PPP-H-1581, ordering date (see 5.1) O 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOIL N-6 3548 6.3 Definitions. 6.3.i Crack. A crack i
43、s a clear crystalline fracture passing through or across the grain boundaries without inclusion of foreign elements. Custodians: Amy - AR Air Force - 99 Review activities: Amy = AT, EA DLA - IS NSA - NS User activities: Amy - ME Navy - MC Preparing activity: Army - AR (Project 5310-11l3) , Agent: DLA - IS * US, GOVERNMENT PRINTING OFFICE: 1962-505-022/1384 a Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
