Spiral Fluted Taps (for blind hole)Spiral Fluted Taps(for through hole)Spiral Pointed Taps(for through hole)Hand TapsCementedCarbide TapsRoll TapsSpecial Thread TapsSimple Inspection ToolsPipe TapsThread MillsPremium Thread MillsDiesCenter DrillsCentering Tools Overall Pin Bored hole dia. Bored hole dia. Bored hole depth Bored hole depth Bored hole depth Shanklengthlength(GO)(NOT-GO)(1.5D)(2D)(2.5D)dia.Lℓd1d2ℓ1ℓ2ℓ3Ds⑦ JIS CHECK PINS Access to the Access to theintroductionintroduction ① by Manga. by Manga. Please check the hole size before tapping! Let's check the hole size before tapping 6H class internal threads of M6×1 by using Check-pin for cutting taps. ② ■ How to use CPC-S (Straight type) STEP1 Check the minor dia. for M6×1 6H internal thread ③ STEP2 Size of the Check-pin for M6×1 d1 d2 Select the nearest sizes of the Check-pins to themaxandminsizeofminordiaof6H internal ④ Size L ℓ DS (Percentage of Thread(Percentage of Thread thread by checking the table listed on the left side. Engagement) Engagement)4.917 (100%)5.026(90%) ⇒ ①4.917(100%)and ②5.134(80%) 4.972 (95%) 5.080(85%) Depending on the feature of work-piece materials, itM6 ×17316.565.026(90%)5.134(80%)is beneficial to tapping to make the hole size before ⑤ 5.080 (85%) 5.188(75%) 5.134 (80%) 5.242(70%) tapping as large as possible and within the tolerance. STEP3 Insert the Check-pins ① and ②, selected in step 2.① 4.917② 5.134 ⑥  (100%)  (80%) GOOD The hole is finished within minor dia of 6H class internal threads. ⑦ 1.5D 2D You can easily check hole Check-pin smoothly goes Check-pin doesn't 2.5D depth by the three lines on into the bottom of the hole. go into the hole. its pin as well. ⑧ ■ How to use CPC-T (Taper type) Size L ℓ d1 d2DS(Percentage of Thread(Percentage of ThreadEngagement)Engagement)ProductCode(ℓ1)(ℓ2) ⑨ M6 ×1 61.5 17 6 4.917 (100%) 5.153(78%) CPCT6.0M 3.8 12.8 ×BAD ×BAD GOOD ⑩ Acceptable range Minimum Maximum Bad hole : Check-pin Bad hole : Check-pin line line4.9175.153 doesn't go into the hole goes into the hole over (100%) (78%) ⑪ over the minimum line. the maximum line. JIS ⑦-56