InvoluteSplines andInspection
Society of Automotive Engineers Inc. SponsoredbyAmerican Society of Mechanical Engineers
DEDICATION
This documtnt is dedicsted to the memory of Albert S. Beam. It wa Mr. Beamia baed oe that concept.
National Standard s intended asaguide toid the manufacturerrviaed or wihrewatany time.The proceduresof the AmerloanNtinStanrddnnnyretpludyoewhrirwhndrdnrayfrhpurchasing. or using products procesees or procedures not con-forming to the standard. Americen National Standards are subject to American National Standards Institute.
SAE Technical Board Rules and Regulations
remendedaredvisory only.ThirusebyanyoneengagedIntsCouncisand Commites willnotinvestigaterconsider patentsadhere toanySAEStandrdorSAERecmmendedPracticeandnorporaeresponiblefrprolectingthmvesgaintliblity fr mitment to conform to or. be guided by any technioel report.
CAUTION MOTICE:This Americen National Standard mey be.daete of publication. Purchasers of American National Standards may
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Alltechnicalreporsincluding standardsapprovedandpractioesIn fomulatingand approving technlcreports theTechnical Boardinfringement of patenta.
Copynght e 1996 Society of Automotive Engineers Inc. Printed in U.S.A.
METHOD OF ROUNDING
1wks Mthed of RoundingD 7 nifc g lsches MllmatresDb simply rounded. 7 igaifn fg cod fromcolledinhvol，hn singly rounded.A voies encept 3 pioces fo right of deciml ro nd incding8/96 p 2 plces to ight f decimalMajor Die Fi 4poceorf daim abvs 48/96 sline pi Simly roed. coeed fm ronded inch vole ronded n rcon ofMojor Die Ft Dr placel ight f decmol 3 pleces to rih of decimgl oddifonol deoronce.simply rounded. hen runded in dietion of cored frm rnded inh vol Ds ond D 3letightof deml 2 pleces o right ef dacimal oddlional clegrancs.t0 end incding 48/96 spine pidt 4piaesorih fdecl boe edfrdd iv then rondedn dretn ofis diredlon of ceoronce. 48/96pin pch.Rounded odelionel dearancs.mex piocetoright of decml Colleted ronded 3pice to rig of decil con veedfrnedihvnn plocer lo ig of decil. simply ronded. 3plees to rig odiol con roended in direction of cieerence.meK simgly roumded. veedfmreihvn rounded in direction of clorgnce. min. Cellated frn rounded1 4ploso ri ef dol 3piece to right of decel consinply rounded. veed frdedile roundad in direction of clerence.All vales cxcnpt D 3pletogh of dacimel 4pcesrigldlb lo ond Incluing 48/96 splin plth 2 pioces to right of decimol. coee frondd in voe48/96l pic Simply roundd. hnddndonl odlionol learance. og ow D 4plecs to ght of dce imply roundied. 3ple ro rght of dlc veredeiDr 3plc t rigt of col 2ploce o ri dl rounded in direction of clornc.t0 nd inling 48/96slpi 4pl rif l verefmronddihv rovmded ln directlon of claerence.sbove 48/96 ine pch onded in direcion of clearnce 3 pleces to rih of dciml to ond including 48/96 splie pitch. 2 plecs o right of deil c veedfrrndeih en4peestorif dal ove 48/96 spline pitch. Simply rounded. rounded in dirction of cleoranca.
* Sebsrigt designete tolersnce ces.
SAEB92INVOLUTESPLINESANDINSPECTIONCOMMITTEE
OFFICERS
D.L Thurman ChairmanR.W. Cedoz Vice ChairmanKen McElroy. Secretary
Integrated Computer Technoiogies Inc. Phillip G. BosmanDearbom MI
Michael D. CallesenStrongsville OH Mikmar Enterprises
Robert W.CedozIndianapolis IN Allison Engine Co.
Michael ChaplinContour Hardening Inc. Indianapolis IN
C-Dot Engineering Company Charles DieterlePlymouth MI
Parker Hannifin Corp. Richard T. FriedmanWaltham MA
Dale GardenFraser MI Anderson Cook Inc.
David Graham Gcneral Broach & Engineering Morenci MI
Ronald GreenEaton Corporation Kalamazoo MI
Gary R. HillWest Michigan Spline Holland MI
Dean Isley Borg Wamer AutomotiveSterling Heights MI
Micromatic Textron Ron JanowiakHolland. MI
Outboard Marine Corp. Ken McElroyMilwaukee WI
Frenco GmbH Rudolf OchAltdorf Germany
Don G. OlmsteadVickers Inc. Jackson MS
Charles PadgettSwannanoa NC Gear Tools for Industry
Phillip Rahm Raye Gear Inc.Grosse Pointe MI
Mark Raye Anderson Cook Inc.Fraser MI
Carroll Kent Reece VanGerpen Reece EngineeringCedar Falls A
James RiceGKN Automotive Incorporated Mebane NC
Omar SimonWestland MI Circle Broach Co. Inc.
Dan TirurmanCaterpillr nc.Peoria IL
Eric Wold Anderson Cook Inc.Fraser MI
Secretariat: Fred KemSociety of Automotive Engineers Inc. 400 Commonwealth DriveWarrendale PA 15096-0001
Splines Serrations and Inspection Committee and ANSI StandardsCommitee B92 Involute Splines and Inspection lo update ASA B5.15-1960previously wrien by th formerTchicalCommiteeNo.13ofSectionalCommitee B5onhe Stndardizatin ofSmall Tools andMachine ToolElements.This Commite was organizod inAsociioandsponordbythSocietyfAutmtiveEngineers September 1922 under the procedure of the American StandardsNational Machine Tool Institute and the American Societry of Mechanical Engineers.
ASA B5.15-1950 American Standard on Involute Splines;ASAB5.26-1950 American Standard for Involute Serrations: and ASA B5.31-1953 American Standard for Involute Splines and SerrationsGages and Gaging.
Most of thefeatues ofthe 1960standardare retaind:plusthaddition of three tolerance classes for a total of four. inolute sration ferly applid tnoltsline with The termpressure angle has been deleted and the standard now inclodesthesesplines have beenrearanged accordinglyThe temseation ivoluteslines with3037.5nd5presureleTalefwil no lngerapply tosplines covered by thistandad.
The revisedsandardnowhasonly one fit class foralside ftsplines; the former Class 2 Gt.Clas 1 fit has been deleted because of its infrequent use. The major diameter of the flat root side ft splinehasbeenchangedandatolernce pplid tinlde thrangefth 1950and the 1960 standards. Note tbe tnterchangeabltylimitations when used with internal splines made to previous standards (see Appendlx A Section 26).Each of the hre types ofspines is preceded bydrawing instructioes andexlanaory data
so g fit section.A survey indicated llmited interest nmajor diameter fit splines and for this reason additional tolerance classes were not
mting spinesis dependentonly he spline being withinffective specifications from the tip of the tooth to the form diameterThereforen sideftsptinesthinteal poentmajrdametrnow is shown as a maximum dimension and the extermal ponent intemalmajordiameter and themaximum exemalminor diameter mitor diameter is shown as a minimum dimension. The minimmmust clear the specified form diameter and thus do not need anyadditional controL
The spline specification tables now include a greater number oftolerance level selections.These new tolerance class were added forgatesletiontsutndpoduteedTh seletinsdffronlyinthetolerancesaplid tscewidhandtooththcke. The tolerance class which was used inASAB5.15-1960 is the basisand is now designated as tolerance Class 5.The new tolerance classes are based on the following formulas:
Tolerance Class 4 = Tolerance Class 5 × 0.71
Tolerance Class 6 = Tolerance Class 5 × 1.40
Tolerance Class 7 = Tolerance Class 5 × 2.00
Alldmss lsted n t standard arefr thsd tThereforeanypensation that must be made for operations
which take place during processing such as heat treatment must be taken into account whben selecting the tolerance level formasufacturing.
The standard has the same intemal minimum effective space widthandexteralmaximum effective tooth thickness for all toleranceeffective space widh nd themaximum ffective toohthickes r classes and has wo types of fitFor tooth side fits the minimumo interchangeableasemblybeweenmatingsplines weremadeothsstandard rgardless of the toierance class of the individl mmbes. This allows a tolerance class“mix of mating members which often isproduce thanitsmatend the“averagetoleranceapplied to the an advantage where one member is considerably less difficult othe nesult of specification of Class 5 tolerance to one member and units is such that it satisfies the design need. For instance this can be6 range.The maximum effective tooth thickness is less than the Class 7to itsmatethusprovidinganassembly tolerance in the Classminimmeffective space widthfrmajor diameterfis toallowfor eccentricity variations. The table values have been changed asfollows:
1.Pitch diameter nd base diameter are shown to seven significantdigits in order to be oect to the number of places used in all calcslations.2.All her dmer als ther hamajrdimees frmajr diametefthavebeeneud tthplacesthegfthe decimal point and roundrd toward the direction of moreclearance.
particulrdsigneddscifoutfffectivelne In the event thefta provided in this stndard des nt stisfy apressfitisdesiredhhangoldemadelyllike changeinactatooththickness.Theminimum effective sace spline byaductionranncasinffctiveth hicknesandspace width should alaysbe retained wben special designs are width in this standard is always basic. This basic minimum effective
A revisin was approved by SAE in Juse 1969 and was submittedto the American National Standards Institute for adoptin as an ANSI se sd ss n puson August 18 1969
This standard was reaffirmed by cmmitcc vote in 1996 andincludes the following coections andverifcatios:
1.Table 107s was created toprovide values for minimumeffective clearance used for Major Diameter Fit as referenced in Table 106.2. Table 105 was revised to show proper symbols for misimum effective space width and maximum effective tooth thickness.Table 64 was revised to show values for machining tolerances to 5 decimal places.Tables 53 through 63 were revised to jncorporatecorrect fom clearance values in the calculations for internal and extemal5.Changes of 0.001were made o38 intemal mior diameer form diameters.vals scaedruhut the30an375grdimionaltables to correct puter rounding.
