Общий каталог Yamawa 2022 - 2023 - страница 967

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Boring before tappingSymbolThreadingGage check Check 1Check 2Check 3 Fine Middle Coarse d=2.0mm Internal threads Engagement ratio on cutting taps Internal threads Engagement ratio on roll taps Internal threads Flowchart : M2 tapping PD PD Min 100%Max74.1% Min 100% TMap2s Min Max TMap3s Max Length ofengagement=3.1mm 74.1% 【Length of engagement】 On "middle" engagement class, 7H class can be chosenin case of "L" engagement length. Internal threadsEngagement Internal threads made by roll taps aredierent fromthose made by cuttingtaps on the shape of minor dimameter.TMap4sUnit : mm classi cation EngagementEngagementlength External threads D1length classi cationSShort engagement length4H5H−S≦1（mm）Drill size(ref.)MinMaxMNormal engagement length5H6H7H1＜M≦3（mm）Bored hole size1.61.5671.679LLong engagement length6H7H8H3＜L（mm）Engagement ratio92.4%100%74.1%P=0.4mmD1 is minor diameter of JIS 6H(2nd Class) of internal threadsUnit : mm*Hole size for thread forming tapsMinMax1.791.84Formingconditionchangesdependingonworkpiece'sMaterialandshape.Above is for customer's reference.TMap5sTMap6s Tolerance area of tap's pitch diameter 【Thread class of cutting taps】ClassPD tolerance【Pitch diameter】DiameterofimaginarycylinderorconeInternal threadsP110μｍ〜 25μｍTMap8s which makes equal the width of threadsand width of space between the threads P2 25μｍ〜 40μｍP340μｍ〜 55μｍ TMap1s0 P1P2 P4 55μｍ〜 70μｍ P3Width ofP4 *Above shows the plus toleranceby setting PD basic size as "0". TMap1s2 threads 【Thread class of roll taps】 wWidth of spacebetween threadsPitch Class PD toleranceG438μｍ〜 51μｍ TMap1s-M8.5 diameter G4 G5 51μｍ〜 64μｍ G5G6 G6 64μｍ〜 76μｍ TMap9s-M24*Above shows the plus tolerance Basic size of pitch diameter by setting PD basic size as "0". -150μm -100μm -50μm 1.740mm +50μm +100μm +150μm TMap2s5-M48 Ⅱ G4 G5 G6Tolerance of dies is theP1P2P1P2P3P4 TMap50s-M100 target of external threads Class of dies 6g external threads(-86〜-19) 6H internal threads(0〜90)ⅡSolid diesNRGRGP NP TtFahoprresUadnsified P1 Solid dies JIS 2Class external threads(-80〜-20) JIS 2Class intenal threads(0〜70)P2for Auto LatheWRGRGPWPRelative position of PD tolerance area of external threads, internal threads, taps and gages. TFtahorpresWadhsitworth ( ) ← Basic size of pitch diameter  → (+) ToFanorspSecwrsien（wg mtSharceMhaidns）esused 1.740mm Unit : μm Unit : μmRing gage pitch diameter (for external threads inspection)Plug gage pitch diameter (for internal threads inspection)TFaopr Psipe threads NR6g -96 〜 -86 GR6g -22 〜 -12 GP6H 2 〜 10 NP6H 90 〜 98WRⅡ-80 〜 -72GRⅡ-32 〜 -24GPⅡ4 〜 12WPⅡ62 〜 70NR : NOT GO ring gageGR : GO ring gageGP : GO plug gageNP : NOT GO plug gageTpFaioppresAtmhreeraicdasn WR : NOT GO working ring gage                   WP : NOT GO working plug gage Unit : mmAccuracy of external threads Unit : mmAccuracy of internal threads TFtahoprresMadinsiature Major diameter Pitch diameter Minor diameter Major diameter Pitch diameter Minor diameter 6g 1.886〜1.981 1.654〜1.721 − 6H − 1.740〜1.830 1.567〜1.679 JIS 2class 1.890〜1.980 1.660〜1.720 〜 1.490 JIS 2class − 1.740〜1.810 1.567〜1.679 Sizes-3