The following chart contains ISO, ANSI, MIL, BS, DIN, JIS standard designations and references for threads.
| ISO or ANSI Designation |
Description |
|
| UN |
Unified Inch Screw Thread, Constant-Pitch Series |
B1.1 |
| UNC |
Unified Inch Screw Thread, Coarse-Pitch Series |
B1.1 |
| UNF |
Unified Inch Screw Thread, Fine-Pitch Series |
B1.1 |
| UNEF |
Unified Inch Screw Thread, Extra-Fine Series |
B1.1 |
| UNS |
Unified Inch Screw Thread, Special Diameter Pitch, or Length of Engagement |
B1.1 |
| UNJ |
Unified Inch Screw Thread, Constant-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 |
| UNJEF |
Unified Inch Screw Thread, Fine-Pitch Series, with Rounded Root of Radius 0.15011P to 0.18042P |
B1.15 |
| UNRE |
Unified Inch Screw Thread, Extra-Fine Pitch Series, with Rounded Root of Radius 0.15011P to 0.18042P |
B1.15 |
| 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 |
| UNRF |
Unified Inch Screw Thread, Fine-Pitch Series, with Rounded Root of Radius Not Less Than 0.108P |
B1.1 |
| UNREF |
Unified Inch Screw Thread, Extra-Fine Pitch Series, with Rounded Root of Radius Not Less Than 0.108P |
B1.1 |
| NC5 |
Class 5 Interference Fit External Threads |
B1.12 |
| NC5HF |
For Driving in Hard Ferrous Material of Hardness over 160 Bhn |
B1.12 |
| NC5CSF |
For Driving Copper Alloy and Soft Ferrous Material of 160 Bhn or Less |
B1.12 |
| NC5ONF |
For Driving in Other NonFerrous Material (Nonferrous Materials Other Than Copper Alloys, Any Hardness |
B1.12 |
| NC5 |
Class 5 Interference Fit Internal Threads |
B1.12 |
| NC5 IF |
Entire Ferrous Material Range |
B1.12 |
| NCF INF |
Entire Nonferrous Material Range |
B1.12 |
| 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 |
| UNM |
Unified Miniature Thread Series |
B1.10 |
| NPT |
American Standard Taper Pipe Threads for General Use |
B1.20.3 |
| NPTF |
Dryseal American Standard Taper Pipe Threads |
B1.20.3B |
| F-PTF |
Dryseal Fine Taper Threads Series |
B1.20.3 |
| PTF SAE |
Dryseal SAE Short Taper Pipe Threads |
B1.20.3 |
| PTF SPL |
Dryseal Special Short Taper Pipe Threads |
B1.20.3 |
| SPL PTF |
Dryseal Special Short Taper Pipe Threads |
B1.20.3 |
| ANPT |
Dryseal Special Taper 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 |
| NPSC |
American Standard Straight Pipe Threads in Pipe Couplings |
B1.20.1 |
| NPSF |
Dryseal American Standard Fuel Internal Straight Pipe Threads |
B1.20.3 |
| NPSI |
Dryseal American Standard Intermediate Internal Straight Pipe Threads |
B1.20.3 |
| NH |
American Standard Hose Coupling Threads of Full Form |
B1.20.7 |
| NPSH |
Dryseal American Standard for Hose Coupling Joints with Straight Internal & External Loose Fitting Thread |
B1.20.7 |
| NFPA 1963 |
Fire Hose Threads |
- |
| NHR |
American Standard Hose Coupling Threads for Garden Hose Applications |
B1.20.7 |
| NGT |
National Gas Taper Threads (See Also SGT) |
CGA V-1 |
| NGO |
National Gas Outlet Threads |
CGA V-1 |
| NGS |
National Gas Straight Threads |
CGA V-1 |
| SGT |
Special Gage Taper Threads |
BS.21 |
| R |
British Taper Pipe Threads |
BS.21 |
| Rc Rp |
British Taper Pipe Threads |
BS.21 |
| G |
Straight Pipe Threads |
BS.2779 |
| BSW |
British Parallel Screw Threads |
BS.84 |
| BSF |
British Parallel Screw Threads |
BS.84 |
| BA |
British Screw Threads |
BS.57 |
| ACME C |
Acme Threads, Centralizing |
B1.5 |
| ACME G |
Acme Threads, General Purpose |
B1.5 |
| STUB ACME |
Stub Acme Threads |
B1.8 |
| BUTT |
Buttress Threads, Pull Type |
B1.9 |
| PUCH BUTT |
Buttress Threads , Push Type |
B1.9 |
| AMO |
American Standard Microscope Objective Threads |
B1.11 |
| AWWA |
Underground Service Line Valves and Fittings |
C800-84 |
| DIN |
German Specifications |
- |
| JIS |
Japanese Industrial Standard |
- |
| ISO |
International Standard Organization |
- |
