Thread typesProfileSectional drawingInsertInternal thread pitch [mm]External thread pitch [mm]Page
R knuckle thread 30°RR=0.22105P R=0.25597P R=0.23851P 30 o6-106-10A422
MJ thread for aerospaceMJR=0.18042P---1,5-2,0A423
UNJ unified screw threadUNJR=0.18042P---8-32A424
TR metrical ISO trapezoidal thread 30°Tr30 o R=0.366P1,5-3,01,5-3,0A425
ACME American national thread 29°AC29 o R=0.3707P8-168-16A426
STUB-ACME threadSTAC29 o 0.4224P8-168-16A427
API 60° threadAPMe 90 o 30 o30 o4-54-5A428
API round threadRD90 o 1 o47’ 30 o30 o8-108-10A429

D

E