Machinery's Handbook, 31st Edition
Taps
973
Table 1. Thread Series Designations
American National Standard References
Standard Tap Marking
Product Thread Designation
Third Series
M M M MJ
Metric Screw Threads—M Profile, with basic ISO 68 profile Metric Screw Threads: MJ Profile, with rounded root of radius 0.15011 P to 0.18042 P (external thread only) Class 5 interference-fit thread
B1.13M
NC NC
NC5IF
Entire ferrous material range
B1.12 B1.12
NC5INF Entire nonferrous material range
NPS
NPSC American Standard straight pipe threads in pipe couplings
B1.20.1 B1.20.3 B1.20.7 B1.20.3 B1.20.1
NPSF NPSF
Dryseal American Standard fuel internal straight pipe threads
NPSH NPSH American Standard straight hose coupling threads for joining to American Standard taper pipe threads
NPSI
NPSI
Dryseal American Standard intermediate internal straight pipe threads
NPSL NPSL
American Standard straight pipe threads for loose-fitting mechanical joints with locknuts
NPSM NPSM American Standard straight pipe threads for free-fitting mechanical joints for fixtures
B1.20.1
ANPT ANPT
Pipe threads, taper, aeronautical, national form American Standard taper pipe threads for general use Dryseal American Standard taper pipe threads American Standard taper pipe threads for railing joints
AS-71051 B1.20.1 B1.20.3 B1.20.1 B1.20.3 B1.20.3 B18.29.1
NPT
NPT
NPTF NPTF NPTR NPTR
PTF
PTF
Dryseal American Standard pipe threads
PTF-SPL PTF-SPL Dryseal American Standard pipe threads
STI
STI
Helical coil screw thread inserts- free running and screw locking (inch series)
Unified Inch Screw Thread
N
UN
Constant-pitch series Coarse pitch series
B1.1 B1.1 B1.1 B1.1
NC NF
UNC UNF
Fine pitch series
NEF
UNEF
Extra-fine pitch series
N
UNJ
Constant-pitch series, with rounded root of radius 0.15011 P to 0.18042 P (external thread only)
AS-8879 B1.15 AS-8879 B1.15 AS-8879 B1.15 AS-8879
UNJC Coarse pitch series, with rounded root of radius 0.15011 P to 0.18042 P (external thread only)
NC
NF
UNJF
Fine pitch series, with rounded root of radius 0.15011 P to 0.18042 P (external thread only)
NEF
UNJEF Extra-fine pitch series, with rounded root of radius 0.15011 P to 0.18042 P (external thread only)
N
UNR
Constant-pitch series, with rounded root of radius not less than 0.108 P (external thread only)
B1.1
NC
UNRC Coarse thread series, with rounded root of radius not less than 0.108 P (external thread only)
B1.1
NF
UNRF
Fine pitch series, with rounded root of radius not less than 0.108 P (external thread only)
B1.1
NEF
UNREF Extra-fine pitch series, with rounded root of radius not less than 0.108 P (external thread only)
B1.1 B1.1
NS
UNS
Special diameter pitch, or length of engagement
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