Screw Thread Designations and Symbols A - N

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Fastener and Screw / Bolt Design, Formula and Calculations

Screw Thread Designations and Symbols A - N

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