1、DOD-B-b3LI75 53 M 999990b 0307253 DOD-B-63475 2 February 1981 9 - 15- / MILITARY SPECIFICATION BOLTS, SHOULDER, HEXAGON HEAD, GENERAL SPECIFICATION FOR, METRIC This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification
2、covers one type of short thread and long thread hexagon head shoulder bolt with metric dimensions. 2. APPLICABLE DOCUMENTS 2.1 Issues of documents. The following documents, of the issue in effect on date of invitation for bids or request for proposal, form a part of this specification to the extent
3、specified herein. SPECIFICATIONS FEDERAL QQ-P-416 - Plating, Cadmium (Electrodeposited). QQ-2-325 - Zinc Coating, Electrodeposited, Requirements for. PPP-H-1581 - Hardware (Fasteners and Related Items), Packaging and Packing for Shipment and Storage of. MILITARY DOD-B-63475/1 - Bolts, Shoulder, Hexa
4、gon Head, Long Thread, Metric. DOD-B-63475/2 - Bolts, Shoulder, Hexagon Head, Short Thread, Metric. STANDARDS FEDERAL FED-STD-H28/21 - Screw Thread Standards for Federal Services, Section 21, Metric Screw Threads. FED-STD-66 - Steel: Chemical Composition and Hardenability. MILITARY MIL-STD-105 - Sam
5、pling Procedures and Tables for Inspection by Attributes. MIL-STD-1312 - Fasteners, Test Methods. (Copies of specifications, standards, drawings and publications required by contractors in connection with specific procurement functions should be obtained from the procuring activity or as directed by
6、 the contracting officer.) 2.2 Other publications. The following document forms part of this specification to the extent speci- fied herein. Unless otherwise indicated the issue in effect on date of invitation for bids or request for proposal shall apply. ANSI B18.3.3M-1979 - Hexagon Socket Head Sho
7、ulder Screws, Metric Series. (Application for copies should be addressed to the American Society for Mechanical Engineers, United Engineering Center, 345 E. 47th Street, New York, NY 10017.) Beneficial comnents (recommendations, additions, deletions) and any pertinent data which may be of use in imp
8、roving this document should be addressed to: Comnander, US Army Armament Research and Develop- ment Comnand, 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. THIS DOCUMENT C
9、ONTAINS PAGES. VtU.S.GOVERNMENT PRINTING OFFICE 1981-703-023/1022 FSC 5306 Licensed by Information Handling ServicesI DOD-B-63475 I 3. REQUIREMENTS 3.1 Specification sheets. The individual item requirements shall be as specified herein and in accord- ance with the applicable .specification sheets. I
10、n the event of any conflict between requirements of this specification and the specification sheet, the latter shall govern. 3.2 Material. Recycled and reclaimed materials shall be used to the maximum extent practicable. Bolts shall be made of alloy steel selected -from FED-STD-66, of a composition
11、consistent with mechanical proper- ties specified in 3.4. 3.3 Design. 3.3.1 Threads. Bolt threads shall conform to the “M“ profile and tolerance class 69, after plating, 3.3.2 Head taper. Bolt head taper (angle between any side of the head and the bolt axis) shall be as specified on the applicable s
12、pecification sheet and as defined in FED-STD-H28/21. not greater than 2 degrees. 3.3.3 Head position. The axis of the hexagon head shall be located at a true position with respect to the axis of the bolt (determined over a distance under the head equal to one shoulder diameter) within a tolerance zo
13、ne of a diameter equal to 3 percent of the shoulder diameter for bolts of thread size M10 and smaller, and 6 percent for sizes larger than M10. 3.3.4 Concentricity. The shoulder diameter and thread pitch diameter shall be concentric within 0.10 mm, determined on the shoulder at an axial distance of
14、5 m from the face of the shoulder. 3.3.5 Bearing surface. The bearing surface of the bolt head shall be perpendicular to the bolt axis within 2 degrees for shank lengths up to 100 mm, and within 1 degree for shank lengths over 100 m. 3.4 Mechanical properties. Mechanical properties of bolts shall be
15、 as specified in table I and 3.4.1. TABLE I. Mechanical properties. Minimum area (mm2 1 Thread neck 43.91 65.46 90.42 127.27 156.81 202.82 256.45 291.64 389.52 478.00 702.62 Shoulder 95.03 132.73 176.71 226.98 283.52 346.36 415.47 490.87 615.75 804.24 1134.11 Shear strength (kN) min - 1/ Ultimate te
16、nsile strength of the bolt is L the material and the minimum thread neck area. and the mi-nlmum thread neck area. Zf Single shear strength is based on a stress of 60% of the minimum ultimate tensile strength (471 MPa) (471 MPa) Single y 20.68 30.83 42.59 59.94 73.86 95.53 120.79 137.36 183.46 225.14
17、 330.93 Double 3J 89.52 125.03 166.46 213.82 267.08 326.27 391.37 462.40 580.04 757.59 1068.33 Ultimate tensile l-/ load (kN) min 34.48 51.39 70.98 99.91 123.00 159.22 201.32 228.94 305.77 375.23 551.56 jased on a minimum ultimate tensile strength of 785 MPa for Double shear strength is based on a s
18、tress of 60% of the minimum ultimate tensile strength and tnice the minimum shoulder area. - “ - . Licensed by Information Handling ServicesDOD-B-63475 53 m 7777706 0307255 2 m DOD-B-634.75 3.4.1 Hardness. Bolts shall have z surface hardness of Rockwell 20-30HRC. 3.5 Decarburization. The depth of gr
19、oss decarburization of thread surfaces shall be not greater than 0.015 mm. The depth of partial decarburization at the root shall be not greater than 10% of thread height, and at the crest shall be not greater than 25% of the thread height. 3.6 Protective finish. Bolts shall be cadmium plated in acc
20、ordance with QQ-P-416, type II, class 3 (5.1 pm thick), or zinc plated in accordance with QQ-2-325, type II, class 3 (5.1 pm thick), as specified (see 3.1). 3.7 Identification markings. Bolts shaTl be marked with the property class (see 6.4) and the manufacturers name or registered trademark. Minimu
21、m height (size) of property class markings shall be 2.3 mm for M10 bolts, 3.2 mm for M12 and R14 bolts and 4.0 mm for M16 and larger bolts. Markings shall be located on the top of the head and may be raised or recessed. When raised, markings shall project not less than 0.1 mm for M14 and smaller bol
22、ts and 0.3 mm for M16 and larger bolts, above the surface of the head. The total height (head plus markings) shall not exceed the specified maximum head height plus 0.2 mm for M10 bolts, 0.3 mm for M12 and M14 bolts and 0.4 mm for M16 and larger bolts. 3.8 Workmanship. Finished bolts shall be unifor
23、m in quality and appearance. Surfaces shall be free of foreign matter. Bolt surfaces in the unplated condition shall be free of cracks, bursts, folds, tool marks, seams, voids on the bearing surface, nicks and gouges. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwis
24、e specified in the contract, the contractor is respon- sible for performance of all inspection requirements as specified herein. Except as otherwise specified in the contract, the contractor may use his own or any other facilities suitable for the performance of in- spection requirements specified h
25、erein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in this specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.2 Classification of inspections. Inspecti
26、ons herein are classified as follows: a. Materials inspection (see 4,3). b. Quality conformance inspection (see 4.4). 4.3 Materials inspection. tlaterials inspection shall consist of certification supported by verifying data that materials used in fabricating bolts are in accordance with 3.2, 3.4 an
27、d 3.6. 4.3.1 Protective finish. Sample bolts shall be inspected for minimum thickness and continuity of the plating in accordance with QQ-P-416 or 94-2-325, as applicable (see 3.1). 4.4 Quality conformance inspection. Quality conformance inspection shall be as specified in table II. TABLE II. Qualit
28、y conformance inspection. Inspection Test method Requirement paragraph paragraph Group A Examination 4.5.1 Y Group B flechanical properties 4.5.3 3.5 Decarburization 4.5.2 3.4 All requirements not covered by tests. 4.4.1 Inspection lot. An inspection lot shall consist of all bolts covered by a singl
29、e specification sheet, produced under essentially the same conditions, and offered for inspection at one time. 4.4.2- Rejected lots. If an inspection lot is rejected, the contractor may rework it to correct the defects, or screen out the defectjve units, and resubmit for reinspection. Resubmitted lo
30、ts shall be inspected using tightened inspection. Such lots shall be separate from new lots, and shall be clearly identified as reinspected lots. 3 Licensed by Information Handling Services4.4.3 Sampling for group A inspection. Sam ling shall be in accordance with MIL-STD-105 inspection level II wit
31、h an acceptable quality level (APL! of 1.5 percent defective for major defects. For minor defects, inspection level I with an AQL of 4.0 percent defective shall apply. 4.4.3.1 Classification of defects. Defects shall be classified as specified in table III. Category Critical Major 101 102 103 104 Mi
32、 nor 201 202 203 204 205 206 207 208 209 - “ Standard TABLE III. Classification of defects. Defect Inspection method None defined Threads, not as specified (3.3.1). Thread neck and fillet, under shoulder, not as specified Width across flats, not as specified (3.1). Shoulder diameter, not as specifie
33、d (3.1). Overall length of bolt, not as specified (3.1). Shoulder length, not as specified (3.1). Other dimensions, not as specified (3.1). Protective finish missing (3.6). Neck and fillet under head, not as specified (3.1). Head taper, not as specified (3.3.2). Bearing surface - bolt axis perpendic
34、ularity, not as Workmanship, not as specified (3.8). Packaging, not as specified (5.1). (3.1). specified (3.3.3). inspection equipment Gage SIE IJ SIE SIE SIE SIE SI E Vi sua1 SIE SIE SI E Visual Visual 4.4.4 Sampling for group B inspection. Sampling shall be in accordance with MIL-STD-105 inspectio
35、n level S-2 with an AQL of 1.5 percent defective. 4.4.4.1 Disposition of sample units. Bolts which have been subjected to group B inspection shall not be delivered on the contract. 4.4.5 Packaging inspection. The sampling and inspection of the preservation-packaging, packing, and container marking s
36、hall be in accordance with PPP-H-1581. 4.5 Methods of inspection. 4.5.1 Examination. Sample bolts shall be thoroughly examined to determine conformance with this specification and applicable specification sheets with respect to all the requirements not covered by tests. 4.5.2 Mechanical properties.
37、Sample bolts shall be tested for conformance to requirements of 3.4. Tensile strength and double shear strength shall be determined in accordance with MIL-STD-1312, test methods 8 and 13, respectively. Surface hardness shall be determined in accordance with MIL-STD-1312, test method 6. 4.5.3 Decarbu
38、rization. When specified (see 6.2), sample bolts shall be tested for conformance with 3.5 in accordance with decarburization measurement methods of ANSI B18.3.3M. 5. PACKAGING 5.1 Packaging requirements. The requirements for packaging shal (see 6.2). 1 be in accordance with PPP-H-1581 6. NOTES 6.1 I
39、ntended use. Shoulder bolts are intended for use as pilots, guides, shafts, pivots and in other applications which require a bolt with a functional shoulder having closely held tolerances on diameter and concentricity. 4 Licensed by Information Handling ServicesDOD-B-63475 53 777770b 0307257 b 000-8
40、-63475 6.2 Ordering data. Procurement documents should specify the following: a. Title, number and date of this specification and the applicable specification sheet. b. Applicable specification sheet part number (see 3.1). c. Decarburization test, if required (see 4.5.3). d. Level (degree) of protec
41、tion, in accordance with PPP-H-1581, ordering data (see 5.1). 6.3 Definitions. 6.3.1 Metric terms and deffnitions. Metric terms used in this specification are defined in ASTM E 380, Standard for Metric Practice. 6.3.2 Quality assurance terms and definitions. Quality assurance terms used in this Spec
42、ification are defined in MIL-STD-109. 6.4 Pr0pert.y class. Property class, indicated by a numerical symbol, is the relationship between nminal tensile strength and nominal yield stress. The symbol consists of two numbersseparated by a decimal marker (which has no mathematical significance), e.g., 8.
43、8. The first number indicates 1/100 of the nominal tensile strength. The second number indicates 1/10 of the ratio, expressed as a percentage, between nominal yield stress and nominal tensile strength. Custodians: Army - AR Navy - SU Air Force - 99 Review activities: Army - AV, MI, AT Navy - SU Air Force - 11 DLA-IS NSA-NS User activities: Amy - CR, WE Navy - AS, MC, OS Preparing activity: Army - AR Agent: DLA-IS (Project 5306-0647) Licensed by Information Handling Services
