Общий каталог Yamawa 2022 - 2023 - страница 978

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Boring before tappingSymbolThreadingGage check Check 1Check 2Check 3 Fine Middle Coarse d=5.0mm Internal threads Engagement ratio on cutting taps Internal threads Engagement ratio on roll taps Internal threads Flowchart : M5 tapping PD PD Min 100%Max76.9% Min 100% TMa2ps TMa3ps Min Max Max Length ofengagement=7.6mm 746.19% 【Length of engagement】 TMa4ps On "middle" engagement class, 7H class can be chosenin case of "L" engagement length. Internal threadsEngagement Internal threads made by roll taps aredierent from those made by cuttingtaps on the shape of minor dimameter.Unit : mm TMa5psTMa6ps classi cation EngagementEngagementlength External threads D1length classi cationSShort engagement length4H5H−S≦2.5（mm）Drill size(ref.)MinMaxMNormal engagement length5H6H7H2.5＜M≦7.5（mm）Bored hole size4.24.1344.334LLong engagement length6H7H8H7.5＜L（mm）Engagement ratio92.4%100%76.9%P=0.8mmD1 is minor diameter of JIS 6H(2nd Class) of internal threadsUnit : mm*Hole size for thread forming tapsMinMax4.594.67Forming condition changes dependingonworkpiece'sMaterialandshape.Above is for customer's reference. Tolerance area of tap's pitch diameter 【Thread class of cutting taps】 TMa8ps 【Pitch diameter】Diameterofimaginarycylinder or cone Class PD toleranceInternal threadsP220μｍ〜40μｍ which makes equal the width of threadsMT1a0psand width of space between the threads P2P3 P3 40μｍ〜60μｍP460μｍ〜80μｍP580μｍ〜100μｍ MT1a2ps P4Width ofP5 *Above shows the plus toleranceby setting PD basic size as "0". threads 【Thread class of roll taps】 Width of spaceM1-MT8a.5psbetween threadsPitch Class PD toleranceG664μｍ〜76μｍ diameter G6M9-MT2a4psG7G8 G7 76μｍ〜89μｍG889μｍ〜102μｍ*Above shows the plus tolerance by setting PD basic size as "0". Basic size of pitch diameter M25-MT4a8ps -200μm -150μm -100μm -50μm 4.480mm +50μm +100μm +150μm +200μm Ⅱ G6 G7 G8 M50-MT1a0p0s Tolerance of dies is the P1 P2 P2 P3 P4 P5 target of external threads For tUhrneiTfaiaedpdss Class of diesⅡ Solid dies 6g external threads(-119〜-24) 6H internal threads(0〜125)NRGRGP NP For WhtihtwrTeoaardtphss P1 Solid dies JIS 2Class external threads(-119〜-24) JIS 2Class intenal threads(0〜125)P2for Auto LatheWRGRGP WPRelative position of PD tolerance area of external threads, internal threads, taps and gages. For oSTncrseeawwitpnhgresm（aadcsShuinsMeeds ） ( ) ← Basic size of pitch diameter  → (+) 4.480mm For Pipe thTreaadpss Unit : μm Unit : μmRing gage pitch diameter (for external threads inspection)Plug gage pitch diameter (for internal threads inspection) NR6g -133 〜 -119 GR6g -33 〜-19 GP6H 2 〜 10 NP6H 125 〜133 FpoirpeAmtherrTeicaaadpnss WRⅡ -119 〜 -111 GRⅡ -36 〜-28 GPⅡ 4 〜 12 WPⅡ 117 〜125NR : NOT GO ring gageGR : GO ring gageGP : GO plug gageNP : NOT GO plug gage WR : NOT GO working ring gage                   WP : NOT GO working plug gage For MtinhiraTetauadrpess Unit : mm Unit : mmAccuracy of external threadsAccuracy of internal threadsMajor diameter Pitch diameter Minor diameterMajor diameter Pitch diameter Minor diameter 6g 4.826〜4.976 4.361〜4.456 − 6H − 4.480〜4.605 4.134〜4.334 JIS 2class 4.826〜4.976 4.361〜4.456 〜 3.994 JIS 2Class − 4.480〜4.605 4.134〜4.334 Sizes-14