International Thread Standards
| Abbreviation |
Country |
Thread
Angle |
Description |
| ISO |
|
60º |
International Organization for Standardization |
| NC |
USA |
60º |
National Coarse |
| UNC |
USA |
60º |
Unified National Coarse |
| NF |
USA |
60º |
National Fine |
| UNF |
USA |
60º |
Unified National Fine |
| UNEF |
USA |
60º |
Unified National Extra Fine |
| UN |
USA |
60º |
Unified National pitch series |
| UNS |
USA |
60º |
Unified Special Thread |
| NPT |
USA |
60º |
National Taper Pipe 1:16 |
| NPTF |
USA |
60º |
National Taper Pipe 1:16 (Dryseal) |
| NPS |
USA |
60º |
National Standard Straight Pipe |
| BSW |
UK |
55º |
British Standard Whitworth |
| BSF |
UK |
55º |
British Standard Fine |
| BSP |
UK |
55º |
British Standard Pipe |
| BSPT |
UK |
55º |
British Standard Pipe Taper |
| BSPP |
UK |
55º |
British Standard Pipe Parallel |
| BA |
UK |
47º |
British Standard Association |