| Abbreviation |
Country |
Thread Angle
° |
Description |
| ISO |
|
60° |
International Organization for Standardization |
| NC |
USA |
60° |
National Coarse |
| UNC |
USA |
60° |
Unified National Coarse |
| NF |
USA |
60° |
National Fine |
| UNF |
USA |
60° |
Unified National Fine |
| UNEF |
USA |
60° |
Unified National Extra Fine |
| UN |
USA |
60° |
Unified National 8-,
12- and 16 pitch series |
| UNS |
USA |
60° |
Special Threads of
American National Form |
| NPT |
USA |
60° |
National Taper Pipe 1:16 |
| NPTF |
USA |
60° |
National Taper Pipe
Dryseal 1:16 |
| NPS |
USA |
60° |
National Standard Straight Pipe |
| NPSM |
USA |
60° |
National Standard Straight Pipe
for free fitting mechanical |
| NPSF |
USA |
60° |
National Standard Internal Straight Pipe
Dryseal |
| BSW |
GB |
55° |
British Standard Withworth Coarse |
| BSF |
GB |
55° |
British Standard Fine |
| BSP |
GB |
55° |
British Strandard Pipe |
| BSPT |
GB |
55° |
British Standard Pipe Taper |
| BA |
GB |
47° |
British Standard Association |