1、AN AMERICAN NATIONAL STANDARDASME B18.6.8-2010Thumb Screws and Wing Screws(Inch Series)INTENTIONALLY LEFT BLANKASME B18.6.8-2010Thumb Screwsand Wing Screws(Inch Series)AN AMERICAN NATIONAL STANDARDThree Park Avenue New York, NY 10016 USADate of Issuance: November 17, 2010This Standard will be revise
2、d when the Society 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 thisStandard. Periodically, certain actions of the ASME B18 Committee may be published as Cases. Cases
3、and interpretations 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 Am
4、erican NationalStandards. 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 op
5、portunity for additional 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
6、in connection with 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
7、of any such patent 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 resp
8、onsibility for only 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,witho
9、ut the prior written permission of the publisher.The American Society of Mechanical EngineersThree Park Avenue, New York, NY 10016-5990Copyright 2010 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.ACONTENTSForeword ivCommittee Roster . vCorrespondence With the B18 Co
10、mmittee vi1 Introductory Notes . 12 General Data 2Tables1 Dimensions of Type A, Regular Thumb Screws 42 Dimensions of Type A, Heavy Thumb Screws . 53 Dimensions of Type B, Regular Thumb Screws 64 Dimensions of Type B, Heavy Thumb Screws 75 Dimensions of Type A, Wing Screws 86 Dimensions of Type B, S
11、tyle 1 Wing Screws . 97 Dimensions of Type B, Style 2 Wing Screws . 108 Dimensions of Type C, Style 1 Wing Screws . 119 Dimensions of Type C, Style 2 Wing Screws . 1210 Dimensions of Type D, Wing Screws 1311 Length Increments 1412 Length Tolerances 1413 Thread Length . 1414 Dimensions of Alternate S
12、tyles of Points for Thumb and Wing Screws . 1515 Type and Style Designations of Thumb Screws and Wing Screws 16iiiFOREWORDDevelopment of this Standard began in 2004 and was completed in 2009 by B18 Subcommittee 6.This Standard was originally published by the Industrial Fasteners Institute (IFI) as I
13、FI-156 in2002. IFI agreed to participate in the conversion of this Standard from an IFI standard to anASME standard. Since the completion of this ASME Standard, IFI-156 has been withdrawn fromcirculation. ASME B18.6.8 is the only standard covering the inch series for thumb and wingscrews.This Standa
14、rd was approved by the ASME B18 Committee in December of 2009, and wasapproved by the American National Standards Institute on March 24, 2010.ivASME B18 COMMITTEEStandardization of Bolts, Nuts, Rivets, Screws,Washers, and Similar Fasteners(The following is the roster of the Committee at the time of
15、approval of this Standard.)STANDARDS COMMITTEE OFFICERSJ. Greenslade, ChairD. S. George, Vice ChairR. D. Strong, Vice ChairC. J. Gomez, SecretarySTANDARDS COMMITTEE PERSONNELV. Cartina, Autocraft IndustrialD. A. Clever, ConsultantP. Cockman, Ford Motor Co.C. A. Dugal, Texas Screw ProductsD. S. Georg
16、e, ND IndustriesC. J. Gomez, The American Society of Mechanical EngineersJ. Greenslade, Industrial Fasteners InstituteJ. J. Grey, Contributing Member, Fastener Consulting Services, Inc.B. Hasiuk, Contributing Member, Defense Supply CenterPhiladelphiaA. Herskovitz, ConsultantJ. Hubbard, Leland-Powell
17、 Fasteners, Inc.J. Jennings, Contributing Member, Naval Surface Warfare CenterW. H. King, Porteous Fastener Co.J. F. Koehl, Contributing Member, Spirol International Corp.SUBCOMMITTEE6SLOTTEDANDRECESSEDHEAD SCREWSR. D. Strong, Chair, ConsultantJ. Hubbard, Vice Chair, Leland-Powell Fasteners, Inc.G.
18、M. Simpson, Vice Chair, Semblex Corp.A. L. Guzman, Secretary, The American Society of MechanicalEngineersD. A. Clever, ConsultantM. A. Elmi, CaterpillarJ. S. Foote, Trade Association Management, Inc.D. S. George, ND IndustriesJ. Greenslade, Industrial Fasteners InstituteA. Herskovitz, ConsultantM. W
19、. Holubecki, Electric Boat Corp.vW. H. Kopke, ConsultantW. J. Lutkus, Emhart TechnologiesD. McCrindle, Canadian Fasteners InstituteM. D. Prasad, Contributing Member, Global M however, they shouldnot contain proprietary names or information.Requests that are not in this format may be rewritten in the
20、 appropriate format by the Committeeprior to being answered, which may inadvertently change 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 aggriev
21、ed by aninterpretation may appeal to the cognizant ASME Committee or Subcommittee. ASME does not“approve,” “certify,” “rate,” or “endorse” any item, construction, proprietary device, or activity.Attending Committee Meetings. The B18 Standards Committee regularly holds meetings thatare open to the pu
22、blic. Persons wishing to attend any meeting should contact the Secretary ofthe B18 Standards Committee.viASME B18.6.8-2010THUMB SCREWS AND WING SCREWS (INCH SERIES)1 INTRODUCTORY NOTES1.1 Scope1.1.1 This Standard covers the general and dimen-sional data for the various types of thumb screws andwing
23、screws recognized as standard.1.1.2 The inclusion of dimensional data in thisStandard is not intended to imply that all of the productsdescribed are stock production sizes. Purchasers mustconsult with suppliers concerning stock sizes.1.2 Comparison With ISO StandardsThere are no ISO standards at thi
24、s time for theseproducts.1.3 DimensionsAll dimensions are in inches unless otherwise statedin this Standard. When nominal sizes are designated indecimals, zeros in the fourth place shall be omitted.1.4 TerminologyFor definition of terms other than those defined belowrelating to fasteners or componen
25、ts thereof used in thisStandard, refer to ASME B18.12.thumb screw: a screw with a flattened head designed formanual turning without a driver or wrench. The thumbscrews covered by this Standard are classified by typeson the basis of design characteristics. They consist ofthe following:Type A thumb sc
26、rews: forged one-piece screws with ashoulder under head that are available in two series:regular and heavy. Dimensions are given in Tables 1 and2, respectively.Type B thumb screws: forged one-piece screws withoutshoulder that are available in two series: regular andheavy. Dimensions are given in Tab
27、les 3 and 4,respectively.wing screw: a screw with a wing-shaped head designedfor manual turning without a driver or wrench. Thewing screws covered by this Standard are classified firstby type, on the basis of the method of manufacture, andsecondly by style, on the basis of design characteristics.The
28、y consist of the following:Type A wing screws: screws of two-piece constructionwith cold-formed or cold-forged wing portions of mod-erate height. In some sizes they are produced in regular,light, and heavy series to best suit the requirements ofspecific applications. Dimensions are given in Table 5.
29、1Type B wing screws: screws of hot-forged one-piececonstruction available in two wing styles: Style 1, withwings of moderate height; and Style 2, with high wings.Dimensions are given in Tables 6 and 7, respectively.Type C wing screws: screws available in two styles:Style 1, a one-piece die-cast cons
30、truction with wings ofmoderate height; and Style 2, a two-piece constructionwith a die-cast wing portion of moderate height. Dimen-sions are given in Tables 8 and 9, respectively.Type D wing screws: screws of two-piece welded con-struction with stamped sheet metal wing portions ofmoderate height. Di
31、mensions are given in Table 10.1.5 Referenced StandardsUnless otherwise specified, the referenced standardsshall be the most recent issue.ASME B1.1, Unified Inch Screw Threads (UN and UNRThread Form)ASME B1.3, Screw Thread Gaging Systems forAcceptability Inch and Metric Screw Threads (UN,UNR, UNJ, M
32、, and MJ)ASME B18.2.9, Straightness Gage and Gaging for Boltsand ScrewsASME B18.12, Glossary of Terms for MechanicalFastenersASME B18.18.2, Inspection and Quality Assurance forHigh-Volume Machine Assembly FastenersASME B18.24, Part Identifying Number (PIN) CodeSystem Standard for B18 Fastener Produc
33、tsPublisher: The American Society of MechanicalEngineers (ASME), Three Park Avenue, New York,NY 10016-5990; Order Department: 22 Law Drive, P.O.Box 2900, Fairfield, NJ 07007-2900 (www.asme.org)ASTM DS-56I, Metals Order Department: 22 Law Drive, P.O.Box 2900, Fairfield, NJ 07007-2900 (www.asme.org)2
34、GENERAL DATA2.1 Heads and WingsThe details of head and wing contour shall be optionalwhen the manufacturer provides and maintains dimen-sions in the applicable table. The design of two-piecewing screws shall be such that the wing portions shallbe retained on and not rotate about the shank portionswh
35、ere screws are tightened and loosened with fingerpressure.2.2 Bearing SurfaceThe bearing surface of the shoulder on all wing screwsand on Type A thumb screws shall be at right angles tothe axis of the screw shank within a tolerance of 4 deg.The surface shall be free from burrs, fins, and protrudings
36、urface irregularities.2.3 Length2.3.1 Measurement. The length, L, of thumb orwing screws shall be measured parallel to the axis ofthe screw from the intersection of the head or shoulderwith the shank to the extreme end of the screw.2.3.2 Standard Lengths. The standard lengthswithin the practical scr
37、ew length ranges specified in therespective dimensional tables for the various types andsizes of thumb and wing screws shall be as tabulatedin Table 11.2.3.3 Tolerance on Length. The tolerance on lengthof screw shall be as tabulated in Table 12.2.4 ThreadsThreads for all types of thumb screws and wi
38、ng screwsshall be in conformance with ASME B1.1, Class 2A,before plating or coating. The applicable thread sizelimits after plating or coating shall be Class 3A maxi-mum and Class 2A minimum. Thread acceptability shallbe determined using ASME B1.3, System 21.2.5 Length of ThreadScrews shall have thr
39、ead lengths conforming toTable 13.2.6 PointsThumb and wing screws shall be supplied with plainsheared ends. When specified, screws may be obtainedwith cone, cup, dog, flat, or oval points conforming todimensions shown in Table 14.22.7 StraightnessWing and thumb screws shall be straight within thelim
40、its of 0.006 in./in. using the gage and procedure inASME B18.2.9.2.8 Material2.8.1 Thumb Screws2.8.1.1 Thumb screws of all types shall be madefrom low carbon steel per UNS designation G10060 orhigher, having 48,000 psi min. ultimate tensile strength.2.8.1.2 When specified, case-hardened thumbscrews
41、shall be supplied when using UNS designatedlow carbon steel G10180 or higher as defined inASTM DS-56I.2.8.1.3 Thumb screws may also be made fromcorrosion-resistant steel, brass, aluminum, or othermaterials as agreed upon by the supplier and purchaser.2.8.2 Wing Screws2.8.2.1 Type A. Type A wing scre
42、ws shall be sup-plied in carbon steel with the shank portion case hard-ened. When specified, they may also be made fromcorrosion-resistant steel, brass, aluminum, or othermaterials as agreed upon by the supplier and purchaser.2.8.2.2 Type B. Both portions of Type B wingscrews shall be made from carb
43、on steel per UNS desig-nation G10060 or higher. When specified, they may alsobe made from corrosion-resistant steel, brass, aluminum,or other materials as agreed upon by the supplier andpurchaser.2.8.2.3 Type C. Type C, Style 1 wing screws shallbe supplied only in die-cast zinc alloy such as UNSdesi
44、gnation Z33520.Type C, Style 2 wing screws shall have wing portionmade from die-cast zinc alloy such as UNS designationZ33520 with shank portion made from low carbon steelper UNS designation G10060 or higher. When specified,the shank portion may be made from corrosion-resistantsteel, brass, aluminum
45、, or other materials as agreedupon by the supplier and purchaser.2.8.2.4 Type D. Both portions of Type D wingscrews shall be supplied in carbon steel per UNS desig-nation G10060 or higher. When specified, they may alsobe made from corrosion-resistant steel, brass, aluminum,or other materials as agre
46、ed upon by the supplier andpurchaser. See Table 15.2.9 FinishUnless otherwise specified, thumb screws and wingscrews shall be supplied with a plain (unplated oruncoated) finish. When an electrodeposited finish isrequired, appropriate finish code in ASTM F 1941 shallbe referenced.ASME B18.6.8-20102.1
47、0 WorkmanshipThumb and wing screws shall not contain an excessof surface imperfections that might affect their service-ability, such as burrs, seams, laps, loose scale, and otherirregularities. When specified on the purchase order,surface discontinuities shall meet the requirements ofASTM F 788/788M
48、 for screws14in. size and larger.2.11 DesignationWhen specifying thumb and wing screws, the follow-ing data shall be included in this sequence:(a) ASME B18.6.8(b) standard type (wing screw or thumb screw)(c) thread size including nominal diameter andthreads per inch(d) length (fractions or decimal e
49、quivalents)(e) style and/or series(f) point type (if other than sheared point)3(g) material(h) finishEXAMPLES: ASME B18.6.8, wing screw,38-16 H11547 2.00, Type B,Style 2, dog point, steel per UNS G10060, zinc plated perASTM F 1941, Fe/Zn 3AASME B18.6.8, thumb screw, 10-32H115471.00, Type A, regular, stain-less steel per UNS S30400, plain finishNOTE: The ASME product numbering system ASME B18.24 doesnot currently cover these products, but it may be added in thefuture.2.12 Manufacturers IdentificationManufacturers identification is not required unlessspecified by the purchaser.2.13
