Общий каталог Yamawa 2022 - 2023 - страница 987

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Boring before tappingSymbolThreadingGage check Check 1Check 2Check 3 Fine Middle Coarse d=8.0mm Internal threads Engagement ratio on cutting taps Internal threads Engagement ratio on roll taps Internal threads Flowchart : M8 tapping PD PD Min 100%Max80.4% Min 100% TMap2s Min Max TMap3s Max Length ofengagement=12.1mm 7840.14% 【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≦4（mm）Drill size(ref.)MinMaxMNormal engagement length5H6H7H4＜M≦12（mm）Bored hole size6.86.6476.912LLong engagement length6H7H8H12＜L（mm）Engagement ratio88.7%100%80.4%P=1.25mmD1 is minor diameter of JIS 6H(2nd Class) of internal threadsUnit : mm*Hole size for thread forming tapsMinMax7.367.49Formingconditionchangesdependingonworkpiece'sMaterialandshape.Above is for customer's reference.TMap5sTMap6s Tolerance area of tap's pitch diameter 【Thread class of cutting taps】ClassPD tolerance【Pitch diameter】DiameterofimaginarycylinderorconeIinternal threadsP220μｍ〜40μｍTMap8s which makes equal the width of threadsand width of space between the threads P2P3 P3 40μｍ〜60μｍP460μｍ〜80μｍ TMap1s0P580μｍ〜100μｍ P4Width ofP5 *Above shows the plus toleranceby setting PD basic size as "0". TMap1s2 threads 【Thread class of roll taps】 Width of spacebetween threadsPitch Class PD toleranceG776μｍ〜89μｍ TMap1s-M8.5 diameter G7G8 G8 89μｍ〜102μｍ*Above shows the plus toleranceby setting PD basic size as "0".TMap9s-M24 Basic size of pitch diameter -200μm -150μm -100μm -50μm 7.188mm +50μm +100μm +150μm +200μm TMap2s5-M48 Ⅱ G7 G8 P1Tolerance of dies is the P2 P2 P3 P4 P5 TMap50s-M100 target of external threads Class of dies 6g external threads(-146〜-28) 6H internal threads(0〜160)ⅡSolid diesNRGRGP NP TtFahoprresUadnsified P1 Solid dies JIS 2Class external threads(-150〜-40) JIS 2Class intenal threads(0〜130)P2for Auto LatheWRGRGP WPRelative position of PD tolerance area of external threads, internal threads, taps and gages.TFtahorpresWadhsitworth ( ) ← Basic size of pitch diameter → (+) ToFanorspSecwrsien（wg mtSharceMhaidns）esused 7.188mm Unit : μm Unit : μmRing gage pitch diameter(for external threads inspection)Plug gage pitch diameter(for internal threads inspection)TFaopr Psipe threads NR6g -160 〜-146 GR6g -37〜-23 GP6H 7 〜 17 NP6H 160 〜 170 WRⅡ -150 〜-142 GRⅡ -52 〜-44 GPⅡ 4 〜 12 WPⅡ 122 〜 130NR : 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 7.760〜7.972 7.042〜7.160 − 6H − 7.188〜7.348 6.647〜6.912 JIS 2class 7.790〜7.960 7.038〜7.148 〜 6.427 JIS 2class − 7.188〜7.318 6.647〜6.912 Sizes-23