Общий каталог Yamawa 2022 - 2023 - страница 987

Flowchart : M8 tapping PD PD Boring before tapping Engagement ratio on cutting taps Check 1 Engagement ratio on roll taps Min Internal threads Min 100% 100% Max 80.4% Internal threads M2 Internal threads Ta ps M3 Min Max Ta ps Max Length of engagement=12.1mm 80.4% 74.1% 【Length of engagement】 On "middle" engagement class, 7H class can be chosen Internal threads made by roll taps are M4 in case of "L" engagement length. different from those made by cutting Ta Internal threads taps on the shape of minor dimameter. ps Engagement Unit : mm Symbol Middle Coarse classification Engagement Unit : mm D1 d=8.0mm Fine Engagement length External threads Drill size Min *Hole size for thread forming taps length classification (ref.) Max M5 S Short engagement length 4H 5H − S≦4（mm） Min Max Ta M Normal engagement length 5H 6H 7H 4＜M≦12（mm） Bored hole size 6.8 6.647 6.912 7.36 7.49 ps L Long engagement length 6H 7H 8H 12＜L（mm） Engagement ratio 88.7% 100% 80.4% Forming condition changes depending on workpiece's Material and shape. P=1.25mm D1 is minor diameter of JIS 6H(2nd Class) of internal threads Above is for customer's reference. M6 Ta ps Tolerance area of tap's pitch diameter 【Thread class of cutting taps】 M8 Class PD tolerance Ta ps 【Pitch diameter】 P2 20μｍ〜40μｍ Diameter of imaginary cylinder or cone Internal internal threads P3 40μｍ〜60μｍ Check 2 which makes equal the width of threads and width of space between the threads M1 0 P4 60μｍ〜80μｍ Ta ps P2 P3 P5 80μｍ〜100μｍ P4 *Above shows the plus tolerance M1 Width of P5 by setting PD basic size as "0". Ta 2 ps threads 【Thread class of roll taps】 Width of space Class PD tolerance M1 between threads Ta -M G7 76μｍ〜89μｍ ps 8.5 Pitch Threading diameter G8 89μｍ〜102μｍ G7 M9 G8 *Above shows the plus tolerance by setting PD basic size as "0". Ta -M ps 24 Basic size of pitch diameter -200μm -150μm -100μm -50μm 7.188mm +50μm +100μm +150μm +200μm M2 Ta 5-M ps 48 Ⅱ G7 G8 P1 M5 Ta 0-M1 P2 P3 P4 P5 ps 00 Tolerance of dies is the P2 target of external threads Fo Class of dies 6g external threads(-146〜-28) 6H internal threads(0〜160) rU thr nifie e NR GR GP NP Ta ads d Ⅱ Solid dies ps P1 Solid dies JIS 2Class external threads(-150〜-40) JIS 2Class intenal threads(0〜130) For P2 for Auto Lathe WR GR GP WP W thr hitwo e r Ta ads th ps Relative position of PD tolerance area of external threads, internal threads, taps and gages. For S crew on se threads w us Ta ing machi ed (–) ← Basic size of pitch diameter → (+) ps（ nes M）S 7.188mm Unit : μm Unit : μm For P Ta ipe th Ring gage pitch diameter(for external threads inspection) Plug gage pitch diameter(for internal threads inspection) ps read s Check 3 NR6g -160 〜-146 GR6g -37〜-23 GP6H 7 〜 17 NP6H 160 〜 170 For WRⅡ -150 〜-142 GRⅡ -52 〜-44 GPⅡ 4 〜 12 WPⅡ 122 〜 130 A pip meric Gage check e a Ta thre n NR : NOT GO ring gage GR : GO ring gage GP : GO plug gage NP : NOT GO plug gage ps ads WR : NOT GO working ring gage WP : NOT GO working plug gage For Unit : mm Unit : mm M thr iniatu e Accuracy of external threads Accuracy of internal threads Ta ads re ps 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