Designations | Thread Series | ANSI/ASME Reference |
M | Metric screw threads - M profile with basic ISO 68 Profile | B1.13M |
MJ | Metric screw threads - MJ profile with rounded root of radius 0.15011P to 0.18042P | B1.21M |
NPSF | Dryseal American Standard fuel internal straight pipe threads | B1.20.3 |
NPSH | American Standard straight hose coupling threads for joining to American Standard taper pipe threads | B1.20.7 |
NPSL | American Standard straight pipe threads for loose-fitting mechanical joints with locknuts | B1.20.1 |
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 | B1.20.1 |
NPTF | Dryseal American Standard taper pipe threads | B1.20.3 |
Stub Acme/Acme | Stub Acme threads | B1.8 |
UN | Unified inch screw thread, constant-pitch series | B1.1 |
UNF | Unified inch screw thread, fine-pitch series | B1.1 |
UNEF | Unified inch screw thread, extra-fine pitch series | B1.1 |
UNJ | Unified inch screw thread, constant-pitch series, with rounded root of radius 0.15011P to 0.18042P (2) | B1.15 |
UNJC | Unified inch screw thread, coarse-pitch series, with rounded root of radius 0.15011P to 0.18042P (2) | B1.15 |
UNJF | Unified inch screw thread, fine-pitch series, with rounded root of radius 0.15011P to 0.18042P (2) | B1.15 |
UNJEF | Unified inch screw thread, extra-fine pitch series, with rounded root of radius 0.15011P to 0.18042P (2) | B1.15 |
UNS | Unified inch screw thread, special diameter pitch or length of engagement | B1.1 |