Pipe Tap Series Overall Thread Position on Shank Size of Length of length length basic dia. dia. square square L ℓ ℓg Ds K ℓk Spiral Fluted Taps (for blind hole) CT-S-PT Carbide Taps for Taper Pipe Threads, Short (ℓg) Type, for Cast Irons Spiral Fluted Taps (for through hole) Specification Spiral Pointed Taps (for through hole) Recommended Tapping Speeds depending on Materials Cast irons Ductile cast irons Brass castings TYPE:1 〜5 〜5 〜5 (m/min) (m/min) (m/min) Hand Taps For icon explanation, refer to P.50 g Cemented Carbide Taps Segment:1L 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 TCST02K 2.5P 9.728 55 16.5 10.5 8 6 9 4 1 △ Roll Taps PT 1/4-19 Ⅱ TCST04- 2.5P 13.157 62 19.5 12.5 11 9 12 4 1 △ PT 3/8-19 Ⅱ TCST06- 2.5P 16.662 65 21 14 14 11 14 4 1 △ PT 1/2-14 Ⅱ TCST08Q 2.5P 20.955 80 27 17 18 14 17 4 1 △ Special Thread Taps Simple Inspection Tools Pipe Taps Thread Mills Dies Center Drills Centering Tools JIS Pipe-25 ◎=Standard ○=Semi standard △=Made to order 574 For improvement, spec may change without advance notice.