1、AN AMERICAN NATIONAL STANDARDASME B18.16.4-2008Serrated Hex Flange Locknuts 90,000 psi (Inch Series)Intentionally left blank ASME B18.16.4-2008Serrated HexFlange Locknuts90,000 psi(Inch Series)AN AMERICAN NATIONAL STANDARDDate of Issuance: October 7, 2008This Standard will be revised when the Societ
2、y approves the issuance of a new edition. There willbe no addenda issued to this edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisdocument. Periodically, certain actions of the ASME B18 Committee may be published as Cases.Cases and interpretatio
3、ns are published on the ASME Web site under the Committee Pages athttp:/cstools.asme.org as they are issued.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria for American NationalSt
4、andards. The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participate. The proposed code or standard was madeavailable for public review and comment that provides an opportunity for add
5、itional public input from industry, academia,regulatory agencies, and the public-at-large.ASME does not “approve,” “rate,” or “endorse” any item, construction, proprietary device, or activity.ASME does not take any position with respect to the validity of any patent rights asserted in connection wit
6、h anyitems mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent, nor assume any such liability. Users of a code or standard are expresslyadvised that determination of the validity of any such paten
7、t rights, and the risk of infringement of such rights, isentirely their own responsibility.Participation by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted asgovernment or industry endorsement of this code or standard.ASME accepts responsibility for on
8、ly those interpretations of this document issued in accordance with the establishedASME procedures and policies, which precludes the issuance of interpretations by individuals.No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior writ
9、ten permission of the publisher.The American Society of Mechanical EngineersThree Park Avenue, New York, NY 10016-5990Copyright 2008 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword ivCommittee Roster . vCorrespondence With the B18 Committee vi1 Scop
10、e 12 Comparison to ISO Standards 13 Terminology 14 Reference Standards 15 Dimensions . 16 Serrations 17 Tops of Nuts 18 True Position of Hexagon to Tapped Hole . 19 Countersink. 110 Threads 311 Material and Hardness 312 Mechanical Requirements 313 Finish 414 Grade and Identification Marking 415 Insp
11、ection and Quality Assurance 416 Designation. 417 Options 418 Workmanship . 4Tables1 Regular Serrated Flange Locknuts 22 Large Serrated Flange Locknuts 33 Proof Load and Torque Values . 4iiiFOREWORDThis 2008 edition was approved by the American National Standards Institute on August 25,2008, and des
12、ignated as ASME B18.16.4-2008.ivASME B18 COMMITTEEStandardization of Bolts, Nuts, Rivets, Screws,Washers, and Similar Fasteners(The following is the roster of the Committee at the time of approval of this Standard.)STANDARDS COMMITTEE OFFICERSD. A. Clever, ChairR. D. Strong, Vice ChairR. L. Crane, S
13、ecretarySTANDARDS COMMITTEE PERSONNELV. Cartina, Continental-AeroD. A. Clever, Deere however, theyshould not contain proprietary names or information.Requests that are not in this format may be rewritten in the appropriate format by the Committeeprior to being answered, which may inadvertently chang
14、e the intent of the original request.ASME procedures provide for reconsideration of any interpretation when or if additionalinformation that might affect an interpretation is available. Further, persons aggrieved by aninterpretation may appeal to the cognizant ASME Committee or Subcommittee. ASME do
15、es not“approve,” “certify,” “rate,” or “endorse” any item, construction, proprietary device, or activity.Attending Committee Meetings. The B18 Standards Committee regularly holds meetings, whichare open to the public. Persons wishing to attend any meeting should contact the Secretary ofthe B18 Stand
16、ards Committee.viASME B18.16.4-2008SERRATED HEX FLANGE LOCKNUTS 90,000 psi(INCH SERIES)1 SCOPEThis Standard covers the general, dimensional, andmechanical performance requirements for low strengthcarbon steel, case hardened, regular and large serratedflange locknuts (inch series), recognized as Amer
17、icanNational Standard.2 COMPARISON TO ISO STANDARDSThere is no inch series ISO standard for these productsat this time.3 TERMINOLOGYFor definitions of terms relating to fasteners orcomponent features used in this Standard, refer toASME B18.12.4 REFERENCE STANDARDSThe following is a list of publicati
18、ons referenced inthis Standard.ASME B1.1, Unified Inch Screw ThreadsASME B1.3, Screw and Thread Gaging Systems forDimensional Acceptability Inch and Metric ScrewThreads (UN, UNR, UNJ, M, and MJ)ASME B18.12, Glossary of Terms for MechanicalFastenersASME B18.18.2M, Inspection and Quality Assurance for
19、High-Volume Machine Assembly FastenersASME Y14.5M, Dimensioning and TolerancingPublisher: The American Society Of MechanicalEngineers (ASME), Three Park Avenue, New York,NY 10016-5990; Order Department: 22 Law Drive, P.O.Box 2300, Fairfield, NJ 07007-2300ASTM F 606, Test Methods for Determining theM
20、echanical Properties of Externally and InternallyThreaded Fasteners, Washers, Direct TensionIndicators, and RivetsASTM F 812, Specification for Surface Discontinuitiesof Nuts, Inch SeriesASTM F 1941, Electrodeposited Coatings on ThreadedFasteners Unified Inch Screw Threads (UN/UNR)ASTM F 2282, Stand
21、ard Specification for QualityAssurance Requirements for Carbon and Alloy SteelWire, Rods, and Bars for Mechanical Fasteners1ASTM F 2328, Standard Test Method for DeterminingDecarburization and Carburization in Hardened andTempered Threaded Steel Bolts, Screws, and StudsPublisher: ASTM International,
22、 100 Barr Harbor Drive,P.O. Box C700, West Conshohocken, PA 19428-29595 DIMENSIONS(a) Unless otherwise specified, all dimensions in thisStandard shall be as specified in Tables 1 and 2, andsections 6 through 9. All dimensions in this Standardare in inches and apply before plating or coating isspecif
23、ied. When a plating or coating is specified, thefinished product dimensions shall be agreed uponbetween the supplier and purchaser.(b) Symbols specifying geometric characteristics arein accordance with ASME Y14.5M.6 SERRATIONSThe configuration of the serrations shall be at thediscretion of the manuf
24、acturer, provided the perform-ance requirements as specified in para. 12.2 are met.7 TOPS OF NUTSTops of nuts shall be flat and chamfered. The lengthof chamfer at hex corners shall be from 5% to 15% ofthe basic thread size. The surface may be slightly convexor rounded.8 TRUE POSITION OF HEXAGON TO T
25、APPED HOLEAt maximum material condition (MMC), the axis ofthe hexagon shall be located at true position with respectto the axis of the thread pitch diameter within a tolerancezone having a diameter equivalent to 4% of the maxi-mum width across flats.9 COUNTERSINKTapped hole shall be countersunk on t
26、he bearing faceand may be countersunk on the top. The maximumcountersink diameter shall be the thread basic (nominal)major diameter plus 0.030 in. for38in. nominal size nutsand smaller, and 1.08 times the basic major diameter forASME B18.16.4-2008Table 1 Regular Serrated Flange LocknutsBFGA Section
27、8 AA 3X M Table 1MHKJSee section 7See section 6Slight roundingpermissable30 refHigh pointsNominal Size or Minimum MaximumWidth Across Width Across Flange NutBasic Major Minimum Flange PerpendicularityFlats, F Corners, G Diameter, B Thickness, HDiameter of Hex Thick- of BearingThread Max. Min. Max. M
28、in. Max. Min. Max. Min. Height, J ness, K SurfaceNo. 6 0.1380 0.312 0.302 0.361 0.342 0.422 0.408 0.171 0.156 0.10 0.02 0.0148 0.1640 0.344 0.334 0.397 0.381 0.469 0.452 0.203 0.187 0.13 0.02 0.01610 0.1900 0.375 0.365 0.433 0.416 0.500 0.480 0.219 0.203 0.13 0.03 0.01712 0.2160 0.438 0.428 0.505 0.
29、488 0.594 0.574 0.236 0.222 0.14 0.04 0.020140.2500 0.438 0.428 0.505 0.488 0.594 0.574 0.236 0.222 0.14 0.04 0.0205160.3125 0.500 0.489 0.577 0.557 0.680 0.660 0.283 0.268 0.17 0.04 0.023380.3750 0.562 0.551 0.650 0.628 0.750 0.728 0.347 0.330 0.23 0.04 0.0257160.4375 0.688 0.675 0.794 0.768 0.937
30、0.910 0.395 0.375 0.26 0.04 0.032120.5000 0.750 0.736 0.866 0.840 1.031 1.000 0.458 0.437 0.31 0.05 0.0359160.5625 0.875 0.861 1.010 0.982 1.188 1.155 0.506 0.483 0.35 0.05 0.040580.6250 0.938 0.922 1.083 1.051 1.281 1.248 0.569 0.545 0.40 0.05 0.044340.7500 1.125 1.088 1.299 1.240 1.500 1.460 0.675
31、 0.627 0.46 0.06 0.051GENERAL NOTE: Dimensions are in inches.2ASME B18.16.4-2008Table 2 Large Serrated Flange LocknutsBFGA Section 8 AA 3X M Table 2MHKJSee section 7See section 6Slight roundingpermissable30 refHigh pointsNominal Size or Minimum MaximumWidth Across Width Across Flange Nut Thickness,B
32、asic Major Minimum Flange PerpendicularityFlats, F Corners, G Diameter, BHDiameter of Hex Thick- of BearingThread Max. Min. Max. Min. Max. Min. Max. Min. Height, J ness, K Surface140.2500 0.438 0.428 0.505 0.488 0.728 0.700 0.312 0.281 0.15 0.04 0.0245160.3125 0.500 0.489 0.577 0.557 0.820 0.790 0.3
33、75 0.343 0.20 0.04 0.028380.3750 0.562 0.551 0.650 0.628 0.915 0.885 0.406 0.390 0.24 0.04 0.0317160.4375 0.688 0.675 0.794 0.768 1.131 1.100 0.468 0.437 0.26 0.04 0.038120.5000 0.750 0.736 0.866 0.840 1.205 1.175 0.515 0.485 0.29 0.06 0.0419160.5825 0.875 0.861 1.010 0.982 1.300 1.260 0.578 0.546 0
34、.37 0.06 0.044580.6250 0.938 0.922 1.083 1.051 1.360 1.280 0.640 0.600 0.42 0.06 0.045GENERAL NOTE: All dimensions are in inches.nuts larger than38in. No part of the threaded portionshall project beyond the bearing surface.10 THREADSThreads shall be Unified coarse or fine thread series(UNC or UNF se
35、ries) Class 2B, in accordance withASME B1.1.Inspection shall be based on System 21 of ASME B1.3.11 MATERIAL AND HARDNESSUnless otherwise specified, nuts shall be manufac-tured from carbon steel in accordance with ASTM F 2282.The nuts shall have a case hardness of HR 15N 78-90on the surface of the nu
36、t in accordance withASTM F 2328. For referee purposes, case hardness shallbe measured in the serrations.312 MECHANICAL REQUIREMENTS12.1 Proof Load TestNuts shall meet the proof load test using the valuesin Table 3. The proof load test procedure fromASTM F 606 shall be followed.12.2 Break Loose Torqu
37、e TestNuts shall have a break loose torque value equal toor greater than 100% of the seating torque value. Theseating torque value shall be 10% of the values listedin Table 3.(a) Procedure. Place a test bolt through a cold-rolledsteel strip and spacers as required. Assemble a test nutso that at leas
38、t three thread pitches of the bolt extendbeyond the top of the nut. While preventing the steelstrip from rotating, apply the torque value listed inTable 3. Record the seating torque values, break the nutloose from its seated position, and record the highestASME B18.16.4-2008Table 3 Proof Load and To
39、rque ValuesNut Size Nut Sizeand Threads Proof Seating and Threads Proof Seatingper inch Load, lb Torque per inch Load, lb Torque6-32 820 50 in.-lb8-32 1,250 60 in.-lb10-24 1,650 70 in.-lb12-24 2,200 90 in.-lb14-20 2,900 9 ft-lb516-18 4,700 14 ft-lb38-16 7,000 27 ft-lb716-14 9,550 40 ft-lb12-13 12,80
40、0 62 ft-lb916-12 16,400 82 ft-lb58-11 20,300 125 ft-lb34-10 30,000 240 ft-lb6-40 900 55 in.-lb8-36 1,350 65 in.-lb10-32 1,800 75 in.-lb12-28 2,300 95 in.-lb14-28 3,300 10 ft-lb516-24 5,200 15 ft-lb38-24 7,900 29 ft-lb716-20 10,700 43 ft-lb12-20 14,400 68 ft-lb916-18 18,300 90 ft-lb58-18 22,900 140 f
41、t-lb34-16 33,600 269 ft-lbGENERAL NOTE: Proof load values are based on 90,000 psi.torque value. That value is the “break loose torque.” Adifferent unused test bolt, test nut, and hole in the teststrip must be used for every test. The test bolt shallbe prevented from turning during testing. Additiona
42、llubricant shall not be added.(b) Test Bolt. The test bolt shall be plain finished withthreads conforming to Class 2A tolerances as specifiedin ASME B1.1. The bolt shall have an ultimate tensilestrength not less than the specified proof load of the nutto be tested. Bolt length shall be such that a m
43、inimumlength equivalent to six thread pitches as measured fromthe end of the bolt will protrude through the nut whenthe nut is seated.(c) Test Strip. The steel strip must be a minimum of0.060 in. thick, having a hardness between HRB 60 andHRB 90. The strip must have holes for placing the boltthrough
44、 that are 0.010 in. to 0.025 in. over the boltsnominal thread diameter.(d) Torque Measuring Device. Test results may be mea-sured by an analog or digital device that is capable ofindicating and holding a peak torque value. The analogor electronic measuring system shall have a certifiedaccuracy of 2%
45、 or less.13 FINISHUnless otherwise specified, nuts shall be furnishedwith an electrodeposited zinc-plated finish in accor-dance with ASTM F 1941, Fe/Zn 3A.14 GRADE AND IDENTIFICATION MARKINGUnless otherwise specified by the purchaser, thesenuts shall have no grade marking requirements. Nuts414in. an
46、d above in diameter shall be marked with thesource identification marking.15 INSPECTION AND QUALITY ASSURANCEUnless otherwise specified by the purchaser, inspec-tion of serrated flange locknuts shall be in accordancewith ASME B18.18.2M.16 DESIGNATIONSerrated hex flange locknuts shall be designated b
47、ythe following data, preferably in the sequence as follows:(a) product name and designation of standard(ASME B18.16.4)(b) nominal diameter and thread pitch(c) steel property class or material identification, andprotective coating, if required.EXAMPLE: Regular serrated flange locknut, ASME B18.16.4,1
48、2-13, zinc plated per ASTM F 1941 Fe/Zn 3A.17 OPTIONSOptions, where specified, shall be at the discretionof the manufacturer, unless otherwise agreed betweenmanufacturer and purchaser.18 WORKMANSHIPNuts shall be free of surface irregularities that mightaffect their serviceability, such as burrs, sea
49、ms, laps,loose scale, and other irregularities. While control ofsurface discontinuities is important for the applicationintended, ASTM F 812 shall be specified by thepurchaser.ASME B18.16.4-2008B18 AMERICAN NATIONAL STANDARDS FOR BOLTS, NUTS, RIVETS, SCREWS,WASHERS, AND SIMILAR FASTENERSSmall Solid Rivets B18.1.1-1972 (R2001)Large Rivets .B18.1.2-1972 (R2001)Metric Small Solid Rivets .B18.1.3M-1983 (R2001)Square and Hex Bolts and Screws (Inch Series).B18.2.1-1996Square and Hex Nuts (Inch Series) B18.2.2-1987 (R1999)Metric Hex Cap Screws B18.2
