Solid Threading Endmills for Internal Thread with Coolant Hole in the Flutes Solid Threading Endmills for Internal Thread with Coolant Hole in the Flutes ISO 60 ° METRIC . W 55 ° WHIT WORTH ( BSW BSF, BSP, BSB ) ap ap P >i \< P D —— dh6 D —= dh6 15 \ 15 \ 1 / 8P R0.137P Screw Screw •Application: General engineering •Application: General engineering fittings and pipe couplings Dimension ( mm ) Dimension ( mm ) Pitch M Designation TPI BSP No . of flutes Designation ( mm ) M coarse No . of flutes d D ap L fine d D ap L SMTZ 08078 C 14 28 W 28 G1 / 8 8 7.8 14.1 64 3 SMTZ 1010 D 21 1.50 ISO 1.50 cp > 14 10 10.0 21.8 73 4 1010 D 16 19 W 19 G1/4 -3/8 10 10.0 16.7 73 4 1212 D 26 1.50 ISO 1.50 cp > 16 12 12.0 26.3 84 4 1616 E 26 14 W 14 G1/ 2 -7/8 16 16.0 26.3 101 5 1616 D 38 11 W 11 G >1 16 16.0 38.1 101 4 1616 E 33 1.50 ISO 1.50 cp > 20 16 16.0 33.8 101 5 1009 C 20 1.75 ISO 1.75 M 12 cp > 12 10 9.0 20.1 73 3 1009 C 28 1.75 ISO 1.75 M 12 cp > 12 10 9.0 28.9 73 3 NPT 60 ° NATIOANL PIPE 1010 C 27 2.00 ISO 2.00 M 14 cp > 15 10 10.0 27.0 73 3 12118 D 27 2.00 ISO 2.00 M 16 q > 17 ) 12 11.8 27.0 84 4 ap 1615 E 33 2.50 ISO 2.00 M 20 cp > 22 16 15.0 33.8 101 5 D dh6 UN 60 ° AMERICAN UN ( UNC UNF UNEF UNS ) 90°(* Taper 1:16 107 15 \ 108 • Application: Steam , gas and water pipes ap Dimension ( mm ) D dh6 Designation TPI NPT No . of flutes d D ap L 1 / 8P Screw 15 \ SMTZ 08076 C 10 27 NPT 27 1/8 8 7.6 10.8 64 3 •Application: General engineering 1010 D 16 18 NPT 18 1/4-3/8 10 10.0 16.2 73 4 16155 D 22 14 NPT 14 1 / 2-3 / 4 16 15.5 22.7 105 4 Dimension ( mm ) No . of BSPT 55 ° BRITISH STANDARD PIPE Designation TPI UNC UNF UNEF d D ap L flutes ap SMTZ 1010 D 22 20 UN 20 1/2 10 10.0 22.3 73 4 SBH ntt- 1212 E 27 20 UN 20 3 / 4 -1 12 12.0 27.3 84 5 D dh6 06056 C 14 18 UN 18 5 / 16 6 5.6 14.8 58 3 15? * L 12113 D 26 18 UN 18 9 / 16 - 5 / 8 11/ 8 -1 5 / 8 12 11.3 26.1 84 4 90 /1RO137P T f ' Screw 08067 C 16 16 UN 1212 D 31 16 UN 16 16 3/8 3/4 8 12 6.7 12.0 16.7 31.0 64 84 3 4 • Application : Steam, gas and water pipes 08077 C 20 14 UN 14 7 / 16 8 7.7 20.9 64 3 1616 E 37 14 UN 14 7/8 16 16.0 37.2 105 5 Designation Dimension ( mm ) TPI BSPT No . of flutes 10092 C 22 13 UN 13 1/2 10 9.2 22.5 73 3 d D ap L SMTZ 08078 C 14 28 BSPT 28 RC 1 / 8 8 7.8 14.1 64 3 12105 C 26 12 UN 12 9 / 16 12 10.5 26.5 84 3 1010 D 16 19 BSPT 19 RC 1 / 4 - 3 / 8 10 10.0 16.7 73 4 12114 C 28 11 UN 11 5/8 12 11.4 28.9 84 3 1616 E 26 14 BSPT 14 RC 1 / 2 - 7 / 8 16.0 5 16 26.3 101 16144 D 34 10 UN 10 3/4 16 14.4 34.3 101 4 1616 D 28 11 BSPT 11 RC 1 - 2 16 16.0 38.1 101 4