1、ASME B18.2.7.1M-2002METRIC 12-SPLINEFLANGE SCREWSAN AMERICAN NATIONAL STANDARDMETRICIntentionally left blank ErratumtoASME B18.2.7.1M-2002Metric 12-Spline Flange ScrewsOn page 6, angle in right figure to Table 4 revised. The complete table appears on the overleaf.THE AMERICAN SOCIETY OF MECHANICAL E
2、NGINEERSThree Park Avenue, New York, NY 10016-5990December 2002M0181EBLCXKDCSee Table 1 forspline detailPara. 11 AAPara. 16 M15H1100230 degUReCSpline rootSpline O.D.Para. 9 M A M0.25 degH110021.25 deg(See para. 11)See para. 6See detailK1KSLgLSDWDSC2USee Table 3 forfillet detailOptional pointconstruc
3、tion (See para. 15)DCDWKSR2C2Edge contouroptionalASBS12-Spline Flange ScrewsTABLE4DIMENSIONSOF12-SPLINEFLANGESCREWSThreadLength,B,ReferenceMin.ForMax.BearingMin.Min.Max.Max.Min.ScrewTransitionBodyNominalFlangeCircleFlangeSplineHeadChamferSplineForLengthsForThreadDiameter,ScrewDiameter,Diameter,EdgeM
4、in.Height,Height,Height,Junc-Screw125mmScrewLength,DsSizehowever, they should not contain proprietary names orinformation.Requests that are not in this format will be rewritten in this format by the Committeeprior to being answered, which may inadvertently change the intent of the original request.A
5、SME procedures provide for reconsideration of any interpretation when or if additionalinformation that might affect an interpretation is available. Further, persons aggrieved byan interpretation may appeal to the cognizant ASME Committee or Subcommittee. ASMEdoes not “approve,”“certify,”“rate,” or “
6、endorse” any item, construction, proprietary device,or activity.Attending Committee Meetings. The B18 Standards Committee regularly holds meetings,which are open to the public. Persons wishing to attend any meeting should contact theSecretary of the B18 Standards Committee.viiiASME B18.2.7.1M-2002ME
7、TRIC 12-SPLINE FLANGE SCREWS1 GENERAL DATA1.1 Scope(a) This Standard covers the complete general anddimensional data for metric 12-spline flange screwsrecognized as American National Standard.(b) The inclusion of dimensional data in this Standardis not intended to imply that all of the sizes in conj
8、unc-tion with the various options described herein arestock items. Consumers should consult with suppliersconcerning lists of stock production 12-spline flangescrews.(c) The wrenching configuration is defined in SAEAS1325.2 COMPARISON WITH ISO STANDARDS(a) At this time no ISO standard for spline dri
9、vescrews exists, except those for aerospace fastenersincluded in ISO 9254 and ISO 9255. Further, no workwithin ISO is expected for some time. These splinesare not interchangeable with the aerospace ISO splinedesigns.(b) Letter symbols designating dimensional charac-teristics are in accord with those
10、 used in ISO standards,except where capitals have been used instead of lowercase letters used in ISO standards.3 REFERENCED STANDARDSUnless otherwise specified, the standard(s) referencedshall be the most recent issue at the time of orderplacement.ASME B1.13M, Metric Screw ThreadsM ProfileASME B1.3M
11、, Screw Thread Gaging Systems forDimensional Acceptability Inch and Metric ScrewThreads (UN, UNR, UNJ, M, and MJ)ASME B18.2.8, Clearance Holes for Bolts, Screwsand StudsASME B18.12, Glossary of Terms for MechanicalFastenersASME B18.18.1M, Inspection and Quality Assurancefor General Purpose Fasteners
12、1ASME B18.18.2M, Inspection and Quality Assurancefor High-Volume Machine Assembly FastenersASME B18.24.1, Part Identifying Number (PIN) CodeSystem Standard for B18 Externally Threaded Fas-tenersASME Y14.5M, Dimensioning and TolerancingPublisher: American Society of Mechanical Engineers(ASME), Three
13、Park Avenue, New York, NY 10016-5990; Order Department: 22 Law Drive, Box 2300,Fairfield, NJ 07007-2300ASTM F 468M, Standard Specification for NonferrousBolts, Hex Cap Screws, and Studs for General Use(Metric)ASTM F 568M, Standard Specification for Carbon andAlloy Steel Externally Threaded Metric Fa
14、stenersASTM F 738M, Standard Specification for StainlessSteel Metric Bolts, Screws and StudsASTM F 788/F 788M, Standard Specification for Sur-face Discontinuities of Bolts, Screws, and Studs,Inch and Metric SeriesPublisher: American Society for Testing and Materials,(ASTM), 100 Barr Harbor Drive, We
15、st Consho-hocken, PA 19428-2959SAE AS1325, Wrench Configuration, 12 Lobed DrivePublisher: Society of Automotive Engineers (SAE), 400Commonwealth Drive, Warrendale, PA 15096-0001ISO 9254, AerospaceBolt, Normal Spline Head, Nor-mal or Pitch Diameter Shank, Long Length MJThreads, Metallic Material, Coa
16、ted or Uncoated,Strength Classes Less Than or Equal to 1100 MPaDimensionsISO 9255, AerospaceBolts, Normal Spline Head,Normal Shank, Short or Medium Length MJ Threads,Metallic Material, Coated or Uncoated, StrengthClasses Less Than or Equal to 1100 MPaDimen-sionsPublisher: International Organization
17、for Standardization(ISO), 1 rue de Varembe, Case Postale 56, CH-1211, Geneve 20, Switzerland/SuisseMETRIC 12-SPLINE FLANGE SCREWSASME B18.2.7.1M-20024 DIMENSIONS(a) All dimensions in this standard are in millimetersand apply before any coating, unless stated otherwise.(b) Symbols specifying geometri
18、c characteristics arein accord with ASME Y14.5M.5 SPLINEDimensions of the spline are given in Table 1.6 TOP OF HEADThe top of head shall be either full form or indented,at manufacturers option. Top of head shall be chamferedor rounded, and the minimum diameter of chamfercircle or start of rounding s
19、hall be the minimum O.D.of spline, Asmin., minus 2 times the maximum chamferheight, K1. For indented heads, the indent shall havea maximum diameter equal to 0.75 times the minimumroot of spline, Bsmin., and a depth not to exceed themaximum chamfer height, K1.7 HEAD HEIGHTThe head height, K, is the d
20、istance, as measuredparallel to the axis of the screw, from the top of thehead, excluding raised markings, to the plane of thebearing circle diameter.8 SPLINE HEIGHTThe spline height, Ks, is the distance from the topof the head to the end of the full form spline; i.e.,the intersection of the top of
21、the extrusion angle withthe spline root.9 POSITION OF HEADAt maximum material condition, the axis of theoutside diameter of the spline, As, shall be within apositional tolerance zone of the diameter specified inTable 2 with respect to the axis of the shank over adistance under the head equal to the
22、nominal screwdiameter, D. The datum shall be as close to the headas practicable but within 0.5D from the head, and shallbe either wholly plain body or wholly the threadpitch diameter, not including the thread runout or theunderhead fillet.210 FLANGEThe top surface of the flange shall be conical orsl
23、ightly rounded and the periphery shall be round withinthe specified maximum flange diameter and a toleranceof minus 5 percent. The contour of edge at flangeperiphery shall be optional, provided the minimumflange thickness is maintained at the minimum bearingcircle diameter.11 BEARING SURFACEThe bear
24、ing surface shall be conical 0.750.50 degconcave from the plane formed by the bearing circlediameter. The plane formed by the bearing circle shallbe perpendicular to the axis of the shank, over a lengthunder the head equal to the nominal screw diameterD, within the circular runout specified in Table
25、 2. Themeasurement of bearing face runout shall be made atthe actual bearing circle; i.e., at the line of highestpoints on any radial line e.g., by use of a straight edgeanvil. The datum shall be as close to the head aspracticable but within 0.5D from the head, and shallbe either wholly plain body o
26、r wholly the threadpitch diameter, not including the thread runout or theunderhead fillet.12 FILLETThe fillet configurations at the junction of the headand shank shall be either Style A or Style B (Table3), at the option of the manufacturer, unless the filletstyle is specified by the purchaser.NOTE:
27、 Analytical research conducted in the design of the filletconcluded that the maximum stress concentration factors occurringwith Styles A and B configurations were essentially the same.The fillet shall be a smooth and continuous curvefairing smoothly into the underhead bearing surfaceand the shank wi
28、thin the limits specified in Table 3.13 BODY DIAMETERThe diameter of the body on screws which are notthreaded full length shall be within the limits specifiedfor Dsin Table 4. For screws threaded full length, thediameter of the unthreaded shank under the head shallnot exceed the specified maximum bo
29、dy diameter, Ds,in Table 4, nor be less than the minimum body diametergiven in Table 2.Screws of nominal lengths equal to or greater thanthe shortest nominal lengths specified in Table 5 mayMETRIC 12-SPLINE FLANGE SCREWS ASME B18.2.7.1M-2002Maximum materialconditionSee View W12-SplineEnlarged View W
30、30 deg 15 deg 81 deg 79 deg Minimum materialconditionCsmax.Csmin.Rsmin.Bsmin.Asmin.Rsmax.Asmax.Bsmax.TABLE 1 WRENCHING CONFIGURATIONS FOR 12-SPLINE FLANGE SCREWSMax. Material Condition Min. Material ConditionMax. Max. Min. Min. Min. Min. Max. Max.Spline Diameter, Diameter, Radius, Radius, Diameter,
31、Diameter, Radius, Radius,Size AsBsCsRsAsBsCsRs5 5.86 5.22 0.55 0.13 5.71 5.07 0.70 0.266 7.02 6.26 0.61 0.13 6.82 6.06 0.76 0.268 9.37 8.34 0.75 0.23 9.17 8.14 0.90 0.3910 11.70 10.42 0.95 0.23 11.50 10.22 1.10 0.3912 14.04 12.50 1.10 0.36 13.84 12.30 1.25 0.5214 16.29 14.59 1.30 0.48 16.06 14.36 1.
32、45 0.6416 18.71 16.66 1.40 0.48 18.48 16.43 1.55 0.6420 23.40 20.83 1.75 0.74 23.17 20.60 1.90 0.90GENERAL NOTES:(a) All dimensions are in millimeters.(b) See paras. 5 and 6.be obtained with reduced diameter body if so specified.Where reduced diameter body (or “Type R”) is specified,the body diamete
33、r, D2, shall be within the limits specifiedin Table 5. The screw shall have a shoulder under thehead. The diameter, Ds, and length, L2, of the shouldershall be as specified in Table 5.14 LENGTHThe length of the screw shall be measured parallelto the axis of the screw from the plane formed by theunde
34、rhead bearing circle diameter to the extreme end3of the shank. Tolerances for screw lengths are givenin Table 6.15 POINTPoint shall be chamfered or rounded at manufacturersoption from approximately 0.40 mm below the minordiameter of the thread. The first full formed thread islocated a distance no gr
35、eater than two times the pitchmeasured from the end of the screw. The distance isto be determined by measuring how far the point entersinto a cylindrical NOT GO major diameter ring gage.METRIC 12-SPLINE FLANGE SCREWSASME B18.2.7.1M-2002TABLE 2 POSITION TOLERANCE, CIRCULARRUNOUT, AND MINIMUM BODY DIA
36、METERPosition ofHead-to-Shank Circular Min. BodyTolerance Runout Diameter forZone of ScrewsDiameter at Bearing Threaded toNominal MMC Circle FIM HeadScrew Size Note (1) Note (2) Note (3)M5 H11547 0.8 0.35 0.15 4.38M6 H11547 1 0.44 0.18 5.28M8 H11547 1.25 0.44 0.24 7.07M10 H11547 1.5 0.54 0.30 8.89M1
37、2 H11547 1.75 0.54 0.37 10.71M14 H11547 2 0.54 0.43 12.54M16 H11547 2 0.66 0.49 14.54M20 H11547 2.5 0.66 0.61 18.20GENERAL NOTE: All dimensions are in millimeters.NOTES:(1) See para. 9.(2) See para. 11.(3) See para. 13.When supplied, the point radius, Re, and maximumpoint length, U, shall be specifi
38、ed in Table 7.16 STRAIGHTNESSAt maximum material condition, the axes of thescrew body and thread major diameter shall be withina straightness tolerance diameter equal to 0.006 timesthe nominal product length, L, expressed as a two-place decimal. A gage and gaging procedure for check-ing screw straig
39、htness is given in Nonmandatory Appen-dix A.17 THREAD LENGTHThe length of thread on screws shall be controlledby the maximum grip gaging length, Lg, and the mini-mum body length, Ls, as set forth in paras. 17.2 through17.5. For standard diameter-length combinations ofscrews, the values for Lgmax. an
40、d Lsmin. are specifiedin Table 8.NOTE: Incorporation of a common Lgand Lslength for adjacentbolt lengths allows the manufacturer to use fewer tools and reduceset-up time when making these products. When this concept doesnot suit the intended application, the required Lgand Lsdimensionsmay be calcula
41、ted using the formulas given in paras. 17.2 and 17.3.17.1 Grip Gaging Length, Lgmax.Grip gaging length, Lgmax., is the distance, measuredparallel to the axis of the screw, from the plane4formed by the bearing circle diameter to the face of anoncounterbored or noncountersunk standard GO threadring ga
42、ge assembled by hand as far as the thread willpermit. For standard diameter-length combinations ofscrews, the values for Lgmax. are specified in Table8. For diameter-length combinations not listed in Table8, the maximum grip gaging length, as calculated androunded to one decimal place, shall be equa
43、l to thenominal screw length, L, minus the reference nominalthread length, B, as specified in Table 4.Lgmax. p L BLgmax. shall be used as a criterion for inspection.17.2 Body Length, Lsmin.Body length, Lsmin., is the distance, measuredparallel to the axis of the screw, from the plane formedby the be
44、aring circle diameter to the last scratch ofthread or the top of the extrusion angle, whicheveris closest to the head. For standard diameter-lengthcombinations of screws, the values of Lsmin. arespecified in Table 8. For diameter-length combinationsnot listed in Table 8, the minimum body length, asc
45、alculated and rounded to one decimal place, shall beequal to the maximum grip gaging length (as computed)minus the reference transition thread length, X, as givenin Table 4.Lsmin. p Lgmax. XLsmin. shall be used as a criterion for inspection. Screwsof nominal lengths which have a calculated Lsmin.val
46、ue equal to or less than 2.5 times the thread pitchshall be threaded full length. For screws which arethreaded full length, the distance from the plane formedby the bearing circle diameter to the face of a noncoun-terbored or noncountersunk standard GO thread ringgage assembled by hand as far as the
47、 thread willpermit shall not exceed a length equal to 3.0 timesthe thread pitch.17.3 Nominal Thread Length, BNominal thread length, B, as specified in Table 4 isa reference dimension intended for calculation purposesonly, and is the distance, measured parallel to the axisMETRIC 12-SPLINE FLANGE SCRE
48、WS ASME B18.2.7.1M-2002Lf min.R3Junction offillet withbearing surfaceto be a smooth blendVmax.Vmin.LfR4R1 max.R1 min.For concavity ofbearing surface(see para. 11)Style AXfDVDaDaDwStyle BFilletsFor concavity ofbearing surface(see para. 11)Lf max.DwR3TABLE 3 FILLET CONFIGURATION DIMENSIONSStyle A Styl
49、e BVR1LfNominal Max. Max. Max. Reference, Max. Min. Min.Screw Size DaDvMax. Min. LfMax. Min. R4DaXfMax. Min. R3M5 H11547 0.8 6.1 5.5 0.15 0.05 1.4 0.25 0.10 4.05 5.6 0.20 1.4 0.7 0.15M6 H115471 7.4 6.6 0.18 0.07 1.6 0.29 0.12 4.60 6.7 0.25 1.6 0.8 0.18M8 H11547 1.25 10.1 8.8 0.24 0.11 2.1 0.36 0.16 5.71 9.0 0.35 2.1 1.0 0.25M10 H11547 1.5 12.5 10.8 0.31 0.13 2.1 0.45 0.20 5.71 11.0 0.35 2.1 1.0 0.25M12 H11547 1.75 15.7 12.8 0.37 0.16 2.1 0.54 0.24 5.71 13.0 0.35 2.1 1.0 0.25M14 H11547 2 18.1 14.8 0.43 0.19 2.1 0.63 0.28 5.71 15.0 0.35 2.1 1.0 0.25M16 H11547 2 20.5 17.2
