Overall Thread Position on Shank Size of Length of length length basic dia. dia. square square L ℓ ℓg Ds K ℓk CT-PT (for blind hole) Spiral Fluted Taps Carbide Taps for Taper Pipe Threads, Long (ℓg) Type, for Cast Irons Specification (for through hole) Spiral Fluted Taps Recommended Tapping Speeds depending on Materials (for through hole) Spiral Pointed Taps Cast irons Ductile cast irons Brass castings TYPE:1 〜5 〜5 〜5 (m/min) (m/min) (m/min) For icon explanation, refer to P.50 Hand Taps g Segment:1L Carbide Taps Cemented Basic L ℓ ℓg Ds K ℓk No. of Size Class Code Chamfer major dia (mm) (mm) (mm) (mm) (mm) (mm) flutes Type Stock (mm) For Pipe Threads PT 1/8-28 Ⅱ TCPT02K 2.5P 9.728 55 19 13 8 6 9 4 1 △ PT 1/4-19 Ⅱ TCPT04- 2.5P 13.157 62 28 21 11 9 12 4 1 △ Roll Taps PT 3/8-19 Ⅱ TCPT06- 2.5P 16.662 65 28 21 14 11 14 4 1 △ PT 1/2-14 Ⅱ TCPT08Q 2.5P 20.955 80 35 25 18 14 17 4 1 △ PT 3/4-14 Ⅱ TCPT12Q 2.5P 26.441 85 35 25 23 17 20 4 1 △ PT 1 -11 Ⅱ TCPT16U 2.5P 33.249 95 45 32 26 21 24 5 1 △ Simple Inspection Tools Special Thread Taps Pipe Taps Thread Mills Dies Center Drills Centering Tools JIS ◎=Standard ○=Semi standard △=Made to order Pipe-24 For improvement, spec may change without advance notice. 573