Thread Designations
Charts giving ISO and ANSI Thread Designations and Common Thread Names and Abbreviations.
| ISO or ANSI Designation | DESCRIPTION | Ref. ANSI, BS, ISO |
|---|---|---|
| ACME C | Acme Threads, Centralizing | B1.5 |
| ACME G | Acme Threads, General Purpose | B1.5 |
| AMO | American Standard Microscope Objective Threads | B1.11 |
| ANPT | Dryseal Special Taper Pipe Threads | B1.20.3 |
| AWWA | Underground Service Line Valves and Fittings | C800-84 |
| BA | British Screw Threads | BS.57 |
| BSF | British Parallel Screw Threads | BS.84 |
| BSW | British Parallel Screw Threads | BS.84 |
| BUTT | Buttress Threads, Pull Type | B1.9 |
| DIN | German Specifications | - |
| F-PTF | Dryseal Fine Taper Threads Series | B1.20.3 |
| G | Straight Pipe Threads | BS.2779 |
| ISO | International Standard Organization | - |
| JIS | Japanese Industrial Standard | - |
| M | Metric Screw Threads-M Profile with Basic ISO 68 Profile | B1.13M B1.18M |
| MJ | Metric Screw Threads-MJ Profile with Rounded Root of Radius 0.15011P to 0.18042P | B1.21M |
| MJS | Metric Screw Threads-MJ Profile Special Series | B1.21M |
| NC5 | Class 5 Interference Fit External Threads | B1.12 |
| NC5 | Class 5 Interference Fit Internal Threads | B1.12 |
| NC5 IF | Entire Ferrous Material Range | B1.12 |
| NC5CSF | For Driving Copper Alloy and Soft Ferrous Material of 160 Bhn or Less | B1.12 |
| NC5HF | For Driving in Hard Ferrous Material of Hardness over 160 Bhn | B1.12 |
| NC5ONF | For Driving in Other NonFerrous Material (Nonferrous Materials Other Than Copper Alloys, Any Hardness | B1.12 |
| NCF INF | Entire Nonferrous Material Range | B1.12 |
| NFPA 1963 | Fire Hose Threads | - |
| NGO | National Gas Outlet Threads | CGA V-1 |
| NGS | National Gas Straight Threads | CGA V-1 |
| NGT | National Gas Taper Threads (See Also SGT) | CGA V-1 |
| NH | American Standard Hose Coupling Threads of Full Form | B1.20.7 |
| NHR | American Standard Hose Coupling Threads for Garden Hose Applications | B1.20.7 |
| NPSC | American Standard Straight Pipe Threads in Pipe Couplings | B1.20.1 |
| NPSF | Dryseal American Standard Fuel Internal Straight Pipe Threads | B1.20.3 |
| NPSH | Dryseal American Standard for Hose Coupling Joints with Straight Internal External Loose Fitting Thread | B1.20.7 |
| NPSI | Dryseal American Standard Intermediate Internal Straight Pipe Threads | B1.20.3 |
| NPSL | Aeronautical National Form Taper Pipe Threads | MIL P-7105B |
| NPSM | American Standard Straight Pipe Threads for Free-Fitting Mechanical Joints for Fixtures | B1.20.1 |
| NPT | American Standard Taper Pipe Threads for General Use | B1.20.3 |
| NPTF | Dryseal American Standard Taper Pipe Threads | B1.20.3B |
| PTF SAE | Dryseal SAE Short Taper Pipe Threads | B1.20.3 |
| PTF SPL | Dryseal Special Short Taper Pipe Threads | B1.20.3 |
| PUCH BUTT | Buttress Threads , Push Type | B1.9 |
| R | British Taper Pipe Threads | BS.21 |
| Rc Rp | British Taper Pipe Threads | BS.21 |
| SGT | Special Gage Taper Threads | BS.21 |
| SPL PTF | Dryseal Special Short Taper Pipe Threads | B1.20.3 |
| STUB ACME | Stub Acme Threads | B1.8 |
| UN | Unified Inch Screw Thread, Constant-Pitch Series | B1.1 |
| UNC | Unified Inch Screw Thread, Coarse-Pitch Series | B1.1 |
| UNEF | Unified Inch Screw Thread, Extra-Fine Series | B1.1 |
| UNF | Unified Inch Screw Thread, Fine-Pitch Series | B1.1 |
| UNJ | Unified Inch Screw Thread, Constant-Pitch Series with Rounded Root of Radius 0.15011P to 0.18042P | B1.15 |
| UNJEF | Unified 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 |
| UNM | Unified Miniature Thread Series | B1.10 |
| UNR | Unified Inch Screw Thread, Constant-Pitch Series, with Rounded Root of Radius Not Less Than 0.108P | B1.1 |
| UNRC | Unified Inch Screw Thread, Coarse-Pitch Series, with Rounded Root of Radius Not Less Than 0.108P | B1.1 |
| UNRE | Unified 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 |
| UNRF | Unified Inch Screw Thread, Fine-Pitch Series, with Rounded Root of Radius Not Less Than 0.108P | B1.1 |
| UNS | Unified Inch Screw Thread, Special Diameter Pitch, or Length of Engagement | B1.1 |
COMMON THREAD NAMES AND ABBREVIATIONS
THREAD DESIGNATIONS
| THREAD DESIGNATIONS | |
|---|---|
| DESIGNATION | DESCRIPTION |
| ACME 60° STUB | 60° Stub thread form |
| ACME STUB | Stub Acme thread form |
| ACME-C | Acme thread - centralizing |
| ACME-G | Acme thread, general purpose |
| AN | Army and Navy thread |
| ANPT | Aeronautical National Form taper pipe thread |
| AWWA | American Water Works Association |
| BA | British Association Standard thread form |
| BSB | British Standard Brass thread |
| BSC | British Standard Cycle thread |
| BSF | British Standard Fine thread series |
| BSPP | British Standard Pipe Parallel |
| BSPT | British Standard Pipe Taper |
| BSW | British Standard Whitworth |
| CEI | Cycle Engineers Institute Thread |
| CHT | Chemical Hose thread |
| GHT | Garden Hose thread |
| GPI | Glass Packing Institute Thread |
| MM | ISO Metric thread form |
| MJ | Metric Aerospace thread |
| 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 |
| Pg | Panzergewinde thread |
| PTF | Dryseal SAE Short Taper pipe thread |
| RMS | Royal Microscopical Society thread |
| SGT | Special Gas Taper thread form |
| SPL-PTF | Dryseal Short Taper Pipe thread |
| STI | Special Threads for Helical Coil Wire Screw Thread Inserts |
| UN | Unified and American thread series |
| UNC | Unified and American Coarse thread series |
| UNEF | Unified and American Extra-Fine thread series |
| UNF | Unified and American Fine thread series |
| UNIV | Unified Miniature Thread Series |
| UNJ | Unified Thread Series with Controlled Root Radius |
| UNJC | Unified Coarse Thread Series with Controlled Root Radius |
| UNJF | Unified Fine Thread Series with Controlled Root Radius |
| UNR | Unified Constant Pitch thread series with Controlled Root Radius |
| UNRC | Unified Coarse Thread Series with Controlled Root Radius |
| UNRF | Unified Fine Thread Series with Controlled Root Radius |
| UNS | Unified and American threads of selected special diameters and pitches |
| V | Tyre Valve thread |
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