Overall length L ℓ Pin length Bored hole dia. Bored hole dia. Bored hole depth Bored hole depth Bored hole depth (GO) d1 (NOT-GO) d2 (1.5D) ℓ1 ℓ2 (2D) (2.5D) ℓ3 Shank dia. Ds ⑦ JIS CHECK PINS Spiral Fluted Taps (for blind hole) Access to the Access to the ① introduction introduction by Manga. by Manga. Please check the hole size before tapping! Spiral Fluted Taps (for through hole) ② Let's check the hole size before tapping 6H class internal threads of M6×1 by using Check-pin for cutting taps. ■ How to use CPC-S (Straight type) Spiral Pointed Taps (for through hole) STEP ③ 1 Check the minor dia. for M6×1 6H internal thread Hand Taps STEP ④ 2 Size of the Check-pin for M6×1 Select the nearest sizes of the Check-pins to the max and min size of minor dia of 6H internal d1 d2 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%) Cemented Carbide Taps 4.972 (95%) 5.080(85%) Depending on the feature of work-piece materials, it ⑤ M6 ×1 73 16.5 6 5.026 (90%) 5.134(80%) 5.080 (85%) 5.188(75%) is beneficial to tapping to make the hole size before 5.134 (80%) 5.242(70%) tapping as large as possible and within the tolerance. Roll Taps STEP ⑥ 3 Insert the Check-pins ① and ②, selected in step 2. ① 4.917 (100%) ② 5.134 (80%) GOOD The hole is finished within minor dia of 6H class internal threads. Special Thread Taps Simple Inspection Tools 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. Pipe Taps ■ How to use CPC-T (Taper type) ⑧ Thread Mills Premium Thread Mills d1 d2 ⑨ Product Size L ℓ DS (Percentage of Thread(Percentage of Thread (ℓ1) (ℓ2) Code Engagement) Engagement) × × M6 ×1 61.5 17 6 4.917 (100%) 5.153(78%) CPCT6.0M 3.8 12.8 BAD BAD GOOD Dies ⑩ Acceptable range Minimum Maximum line line Bad hole : Check-pin Bad hole : Check-pin Center Drills Centering Tools 4.917 5.153 ⑪ doesn't go into the hole goes into the hole over (100%) (78%) over the minimum line. the maximum line. JIS ⑦-56