| Standard Tap Marking |
Product Thread Designatoin |
Thread Series |
| M |
M |
Metric Screw Threads - M Profile with basic ISO 68 profile |
| M |
MJ |
Metric Screw Threads - M Profile wit rounded root of radius 0.152111P to 0.18042P |
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Class 5 interference-fit thread |
| NC |
NC 5IF |
Entire ferrous material range |
| NC |
NC INF |
Entire nonferrous material range |
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| NPS |
NPSC |
American Pipe Straight pipe threads in pipe coupling |
| NPSF |
NPSF |
Dryseal American Standard fuel internal straight pipe threads |
| NPSAH |
NPSH |
American Standard straight hose coupling threads for joints to American Standard taper pipe threads |
| NPSI |
NPSI |
Dryseal American Standard intrmediate internal straight pipe threads |
| NPSL |
NPSL |
American Standard straight pipe threads for loose-fitting mechanical joints with locknuts |
| NPS |
NPSM |
American Standard straight pipe threds for free-fitting mechanical joints for fixtures |
| NPT |
NPT |
American Standard taper pipe thrads for general use |
| NPTF |
NPTF |
Dryseal American Standard taper pipe threads |
| NPTR |
NPTR |
American Standard taper pipe threads for railing joints |
| N |
UN |
Unified Inch Screw Thread, constant-pitch series |
| NC |
UNC |
Unified Inch Screw Thread, coarse-pitch series |
| NF |
UNF |
Unified Inch Screw Thread, fine-pitch series |
| N |
UNJ |
Unified Inch Screw Thread, constant-pitch series, with rounded root of radius 0.15011P to 0.18042P (ext. thd. only) |
| NC |
UNJC |
Unified Inch Screw Thread, coarse pitch series, with rounded root of radius 0.15011P to to 0.18042P (ext. thd. only) |
| NF |
UNJF |
Unified Inch Screw Thread, fine pitch series, with rounded root of radius 0.15011P to 0.18042P (ext. thd. only) |
| NEF |
UNJEF |
Unified Inch Screw Thread, extra-fine pitch series, with rounded root of radius 0.15011P to 0.18042P (ext. thd. only) |
| N |
UNR |
Unified Inch Screw Thread, constant-pitch series, with rounded root of radius not less than 0.108P (ext. thd.. only) |
| NC |
UNRC |
Unified Inch Screw Thread, coarse thread series, with rounded root of radius 0.15011P to 0.18042P (ext. thd. only) |
| NF |
UNRF |
Unified Inch Screw Thread, fine pitch series, with rounded root of radius not less than 0.108P (ext. thd. only) |
| NEF |
UNREF |
Unified Inch Screw Thread, extra-fine pitch series, with rounded root of radius not less than 0.108P (ext. thd. only) |
| NS |
UNS |
Unified Inch Screw Threa, special dameter pitch, or leght of engagement |
