ISO OR ANSI THREAD DESIGNATIONS

Charts givingISO and ANSI Thread Designations andCommon Thread Names and Abbreviations.

ISO or ANSI
Designation
DESCRIPTIONRef. ANSI, BS, ISO
ACME CAcme Threads, CentralizingB1.5
ACME GAcme Threads, General PurposeB1.5
AMOAmerican Standard Microscope Objective ThreadsB1.11
ANPTDryseal Special Taper Pipe ThreadsB1.20.3
AWWAUnderground Service Line Valves and FittingsC800-84
BABritish Screw ThreadsBS.57
BSFBritish Parallel Screw ThreadsBS.84
BSWBritish Parallel Screw ThreadsBS.84
BUTTButtress Threads, Pull TypeB1.9
DIN German Specifications-
F-PTFDryseal Fine Taper Threads SeriesB1.20.3
GStraight Pipe ThreadsBS.2779
ISO International Standard Organization-
JISJapanese Industrial Standard-
MMetric Screw Threads-M Profile with Basic ISO 68 ProfileB1.13M B1.18M
MJ Metric Screw Threads-MJ Profile with Rounded Root of Radius 0.15011P to 0.18042PB1.21M
MJSMetric Screw Threads-MJ Profile Special SeriesB1.21M
NC5 Class 5 Interference Fit External ThreadsB1.12
NC5Class 5 Interference Fit Internal ThreadsB1.12
NC5 IFEntire Ferrous Material RangeB1.12
NC5CSFFor Driving Copper Alloy and Soft Ferrous Material of 160 Bhn or LessB1.12
NC5HFFor Driving in Hard Ferrous Material of Hardness over 160 BhnB1.12
NC5ONF For Driving in Other NonFerrous Material (Nonferrous Materials Other Than
Copper Alloys, Any Hardness
B1.12
NCF INFEntire Nonferrous Material RangeB1.12
NFPA 1963 Fire Hose Threads-
NGONational Gas Outlet ThreadsCGA V-1
NGSNational Gas Straight ThreadsCGA V-1
NGT National Gas Taper Threads (See Also SGT)CGA V-1
NHAmerican Standard Hose Coupling Threads of Full FormB1.20.7
NHR American Standard Hose Coupling Threads for Garden Hose ApplicationsB1.20.7
NPSCAmerican Standard Straight Pipe Threads in Pipe CouplingsB1.20.1
NPSF Dryseal American Standard Fuel Internal Straight Pipe ThreadsB1.20.3
NPSHDryseal American Standard for Hose Coupling Joints with Straight Internal
External Loose Fitting Thread
B1.20.7
NPSIDryseal American Standard Intermediate Internal Straight Pipe ThreadsB1.20.3
NPSLAeronautical National Form Taper Pipe ThreadsMIL P-7105B
NPSM American Standard Straight Pipe Threads for Free-Fitting Mechanical
Joints for Fixtures
B1.20.1
NPTAmerican Standard Taper Pipe Threads for General UseB1.20.3
NPTF Dryseal American Standard Taper Pipe ThreadsB1.20.3B
PTF SAEDryseal SAE Short Taper Pipe ThreadsB1.20.3
PTF SPLDryseal Special Short Taper Pipe ThreadsB1.20.3
PUCH BUTTButtress Threads , Push TypeB1.9
RBritish Taper Pipe ThreadsBS.21
Rc RpBritish Taper Pipe ThreadsBS.21
SGT Special Gage Taper ThreadsBS.21
SPL PTFDryseal Special Short Taper Pipe ThreadsB1.20.3
STUB ACMEStub Acme ThreadsB1.8
UN Unified Inch Screw Thread, Constant-Pitch SeriesB1.1
UNCUnified Inch Screw Thread, Coarse-Pitch SeriesB1.1
UNEFUnified Inch Screw Thread, Extra-Fine SeriesB1.1
UNFUnified Inch Screw Thread, Fine-Pitch SeriesB1.1
UNJUnified Inch Screw Thread, Constant-Pitch Series with Rounded Root of Radius
0.15011P to 0.18042P
B1.15
UNJEFUnified Inch Screw Thread, Fine-Pitch Series, with Rounded Root of Radius
0.15011P to 0.18042P
B1.15
UNJF Unified Inch Screw Thread, Coarse-Pitch Series, with Rounded Root of Radius
0.15011P to 0.18042P
B1.15
UNMUnified Miniature Thread SeriesB1.10
UNR Unified Inch Screw Thread, Constant-Pitch Series, with Rounded Root of Radius
Not Less Than 0.108P
B1.1
UNRCUnified Inch Screw Thread, Coarse-Pitch Series, with Rounded Root of Radius
Not Less Than 0.108P
B1.1
UNREUnified Inch Screw Thread, Extra-Fine Pitch Series, with Rounded Root of Radius
0.15011P to 0.18042P
B1.15
UNREF Unified Inch Screw Thread, Extra-Fine Pitch Series, with Rounded Root of Radius
Not Less Than 0.108P
B1.1
UNRFUnified Inch Screw Thread, Fine-Pitch Series, with Rounded Root of Radius
Not Less Than 0.108P
B1.1
UNSUnified Inch Screw Thread, Special Diameter Pitch, or Length of EngagementB1.1

COMMON THREAD NAMES AND ABBREVIATIONS

THREAD DESIGNATIONS

THREAD DESIGNATIONS
DESIGNATIONDESCRIPTION
ACME 60° STUB 60° Stub thread form
ACME STUBStub Acme thread form
ACME-CAcme thread - centralizing
ACME-GAcme thread, general purpose
AN Army and Navy thread
ANPTAeronautical National Form taper pipe thread
AWWAAmerican Water Works Association
BABritish Association Standard thread form
BSBBritish Standard Brass thread
BSCBritish Standard Cycle thread
BSFBritish Standard Fine thread series
BSPPBritish Standard Pipe Parallel
BSPTBritish Standard Pipe Taper
BSWBritish Standard Whitworth
CEICycle Engineers Institute Thread
CHTChemical Hose thread
GHTGarden Hose thread
GPIGlass Packing Institute Thread
MMISO Metric thread form
MJMetric Aerospace thread
N BUTT American Buttress screw thread
NCAmerican National Coarse thread series
NEFAmerican National Extra-Fine thread series
NFAmerican National Fine thread series
NGOAmerican National gas outlet threads
NGTAmerican National gas taper threads
NHAmerican National hose & fire hose coupling
NM National Miniature thread series
NPSAmerican Standard straight pipe thread
NPSCAmerican Standard straight pipe thread in couplings
NPSF American Standard internal straight pipe thread (dryseal)
NPSHAmerican Standard straight pipe thread for hose couplings & nipples
NPSI American Standard intermediate straight pipe thread (dryseal)
NPSLAmerican Standard straight pipe thread for locknuts
NPSMAmerican Standard straight pipe thread for mechanical joints
NPTAmerican Standard taper pipe thread
NPTFDryseal American Standard taper pipe thread
NPTRAmerican Standard taper pipe thread for rail fittings
NS Special threads of American National Form
PgPanzergewinde thread
PTFDryseal SAE Short Taper pipe thread
RMSRoyal Microscopical Society thread
SGTSpecial Gas Taper thread form
SPL-PTFDryseal Short Taper Pipe thread
STISpecial Threads for Helical Coil Wire Screw Thread Inserts
UN Unified and American thread series
UNCUnified and American Coarse thread series
UNEFUnified and American Extra-Fine thread series
UNF Unified and American Fine thread series
UNIVUnified Miniature Thread Series
UNJUnified Thread Series with Controlled Root Radius
UNJC Unified Coarse Thread Series with Controlled Root Radius
UNJFUnified Fine Thread Series with Controlled Root Radius
UNRUnified Constant Pitch thread series with Controlled Root Radius
UNRCUnified Coarse Thread Series with Controlled Root Radius
UNRFUnified Fine Thread Series with Controlled Root Radius
UNS Unified and American threads of selected special diameters and pitches
VTyre Valve thread