System overview Threading Internal thread External thread Thread types Profile Sectional drawing Insert pitch [mm] pitch [mm] Page A R=0.22105P R=0.25597P o 30 Turning R knuckle thread 30° R 6-10 6-10 A422 R=0.23851P MJ thread for aerospace MJ --- 1,5-2,0 A423 R=0.18042P B Milling UNJ unified screw thread UNJ --- 8-32 A424 R=0.18042P o 30 TR metrical ISO trapezoidal thread 30° Tr 1,5-3,0 1,5-3,0 A425 C R=0.366P Drilling o 29 ACME American national AC 8-16 8-16 A426 thread 29° R=0.3707P 29 o D STUB-ACME thread STAC 8-16 8-16 A427 Information 0.4224P Technical o o 30 30 API 60° thread AP 4-5 4-5 A428 90 o Me E o o 30 30 API round thread RD 8-10 8-10 A429 o o 90 1 47’ Index A 407