Designation key for taps Walter Threading PROTOTYP Example Tool range blank DIN threading tools A ANSI AC DIN/ANSI D Thread formers E Eco I ISO d

Designation key for taps Walter Threading PROTOTYP Example Tool range blank DIN threading tools A ANSI AC DIN/ANSI D Thread formers E Eco I ISO dimensions J JIS dimensions S Synchrospeed 3 Thread type 0 Metric 1 Metric fine 2 UNC / UN 3 UNF / UNEF 4 G / Rp / Rc 5 NPT / NPSM 6 NPTF 7 PG 8 BSW / W 9 Tr 4 Design type 0 Hand tap 1 Short machine tap 2 Prototex spiral point 3 Paradur straight flutes (or Prototex H) 4 Paradur low-helix 5 Paradur high-helix flutes > 25° 6 Protodyn 7 Machine nut tap, short shank 8 AMB / MMB / Trapezoidal, long shank 9 Stepped AMB/MMB, trapezoidal tap set 5 Tolerance, including shank 0 ISO1/4H, 4HX, 3B, 3BX reinforced shank 1 ISO2/6H, 6HX, 2B, 2BX reinforced shank 2 5G reinforced shank 3 ISO3/6G, 6GX reinforced shank 4 7G, 7GX reinforced shank 5 ISO1/4H, 4HX, 3B, 3BX passing through shank 6 ISO2/6H, 6HX, 2B, 2BX passing through shank 7 5G passing through shank 8 ISO3/6G, 6GX passing through shank 9 7G, 7GX passing through shank 7 Modification 0 no modifications 1 Internal cooling lubrication supply, axial exit 2 Different thread type 3 Extended shank 4 Internal cooling lubrication supply, radial exit 5 Combination of various points 6 Different number of flutes 7 Reduced/different helix 8 Left-hand thread 9 Insert 8 Surface treatment 0 without 2 THL 4 CRN 5 TiN 6 TiCN 7 TAF D 14 2 0 5 6 3 4 2 1 2 3 4 5 6 7 8 1