The following chart contains industry standard designations for Screw thread types.
ACME 60° STUB |
60° Stub thread form |
ACME STUB |
Stub Acme thread form |
ACME-C |
Acme thread - centralizing |
ACME-G |
Acme thread, general purpose |
ANPT |
Aeronautical National Form taper pipe thread |
AWWA |
American Water Works Association |
BA |
British Association Standard thread form |
BSF |
British Standard Fine thread series |
BSPP |
British Standard Pipe Parallel |
BSPT |
British Standard Pipe Taper |
BSW |
British Standard Whitworth |
MM |
ISO Metric thread form |
N BUTT |
American Buttress screw thread |
NC |
American National Coarse thread series |
NEF |
American National Extra-Fine thread series |
NF |
American National Fine thread series |
NGO |
American National gas outlet threads |
NGT |
American National gas taper threads |
NH |
American National hose & fire hose coupling |
NM |
National Miniature thread series |
NPS |
American Standard straight pipe thread |
NPSC |
American Standard straight pipe thread in couplings |
NPSF |
American Standard internal straight pipe thread (dryseal) |
NPSH |
American Standard straight pipe thread for hose couplings & nipples |
NPSI |
American Standard intermediate straight pipe thread (dryseal) |
NPSL |
American Standard straight pipe thread for locknuts |
NPSM |
American Standard straight pipe thread for mechanical joints |
NPT |
American Standard taper pipe thread |
NPTF |
Dryseal American Standard taper pipe thread |
NPTR |
American Standard taper pipe thread for rail fittings |
NS |
Special threads of American National Form |