Special Thread Taps / Simple Inspection Tools CPR-T Check Pins for Bored Holes in thread form tapping (Taper Type) Spiral Fluted Taps (for blind hole) Size Code L ℓ d1 d2 ℓ1 ℓ2 Ds K ℓk Type Stock (mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm) 5/16-18UNC CPRTU05O 90 19.4 7.23 7.38 4.7 14.7 8 6 9 2 ○ 5/16-24UNF CPRTU05M 90 19.4 7.42 7.53 4.7 14.7 8 6 9 2 ○ 3/8-16UNC CPRTU06P 100 23.4 8.72 8.89 6.7 16.7 10 8 11 2 ○ Spiral Fluted Taps (for through hole) 3/8-24UNF CPRTU06M 100 23.4 8.99 9.10 6.7 16.7 10 8 11 2 ○ 7/16-14UNC CPRTU07Q 110 27.4 10.20 10.40 7.7 19.7 12 9 12 2 ○ 7/16-20UNF CPRTU07N 110 27.4 10.48 10.62 7.7 19.7 12 9 12 2 ○ 1/2-13UNC CPRTU08R 110 27.4 11.70 11.92 7.7 19.7 12 9 12 2 ○ Spiral Pointed Taps (for through hole) 1/2-20UNF CPRTU08N 110 27.4 12.06 12.20 7.7 19.7 12 9 12 2 ○ Hand Taps Cemented Carbide Taps Roll Taps Special Thread Taps Simple Inspection Tools Pipe Taps Thread Mills Dies Center Drills Centering Tools JIS ST-21 ◎=Standard ○=Semi standard △=Made to order 544 For improvement, spec may change without advance notice.