Standard System of Tap Marking
Thread Form Symbols
ACME-C Acme Thread- Centralizing
ACME-G Acme Thread - General Purpose
AMO American Standard Microscope Objective Thread
ANPT Aeronautical National Form Taper Pipe Thread (Ground thread tap marked NPT)
BA British Association Standard Thread
BSF British Standard Fine Thread
BSPP British Standard Pipe Parallel Thread
BSPT British Standard Pipe Taper Thread
BSW British Standard Whitworth Coarse Thread
M Metric Screw Thread Series
N American National 8, 12 and 16 Thread Series (8N, 12N, 16N)
N BUTT American Buttress Screw Thread
NC American National Coarse Thread
NEF American National Extra Fine Thread
NF American National Fine Thread
NGO National Gas Outlet Thread
NGT National Gas Taper Thread (see SGT)
NH American National Hose Coupling and Fire Hose Coupling Threads
NPS American National Pipe Straight Pipe Thread
NPSC American National Standard Straight Pipe Thread in Pipe Couplings (Tap marked NPS)
NPSF Dryseal American National Standard Fuel Internal Straight Pipe Thread
NPSH American National Standard Straight Pipe Thread for Hose Couplings
NPSI Dryseal American National Standard Intermediate Internal Straight Pipe Thread
NPSL American National Standard Straight Pipe Thread Loose Fitting Mechanical Joints with
Locknuts
NPSM American National Standard Straight Pipe Thread for Free-Fitting Mechanical Joints for
Fixtures (Tap marked NPS)
NPT American National Standard Taper Pipe Thread (See ANPT, NPTR)
NPTF Dryseal American National Standard Taper Pipe Thread
NPTR American National Standard Taper Pipe Thread for Railing Joints (Taps marked NPT)
NS American National Thread - Special
PG Panzer Gewindeboher
PTF Dryseal SAE Short Taper Pipe Thread
SGT Special Gas Taper Thread
SPL-PTF Dryseal Special Taper Pipe Thread
STI Screw Thread Insert Threads for Helical Coil Wire Inserts
*UN Unified Constant Pitch Thread Series
*UNC Unified Coarse Thread Series
*UNF Unified Fine Thread Series
*UNEF Unified Extra Fine Thread Series
UNJ Unified Thread Series with a 0.15011P to 0.18042P. Controlled Roil Radius on External
Thread only.
UNJC or UNJF Unified Thread Coarse or Fine Series with a 0.15011P to 0.18042P Controlled Root Radius on External Thread only.
UNM Unified Miniature Thread Series
UNR Unified Constant Pitch Thread Series with a 0.108P to 0.144P Controlled Root Radius;
External Thread only
UNRC or UNRF Unified Constant Pitch Coarse or Fine Thread Series with a 0.108P to 0.144P Controlled
Root Radius; Ext. Thread only
*UNS Unified Thread Special
V 60ยบ thread with Truncated Crest and Root. The theoretical "V" Form is usually flatted to
the user's specifications.
WHIT British Standard Whitworth Special Thread
AMO American Standard Microscope Objective Thread
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| J.A.M TAYLOR TOOL M6 x 1.0 Metric D5 HSS GT 4 Flutes Taper Tap 8" |
BA British Association Standard Thread
BSF British Standard Fine Thread
BSPP British Standard Pipe Parallel Thread
BSPT British Standard Pipe Taper Thread
BSW British Standard Whitworth Coarse Thread
M Metric Screw Thread Series
N American National 8, 12 and 16 Thread Series (8N, 12N, 16N)
N BUTT American Buttress Screw Thread
NC American National Coarse Thread
NEF American National Extra Fine Thread
NF American National Fine Thread
NGO National Gas Outlet Thread
NGT National Gas Taper Thread (see SGT)
NH American National Hose Coupling and Fire Hose Coupling Threads
NPS American National Pipe Straight Pipe Thread
NPSC American National Standard Straight Pipe Thread in Pipe Couplings (Tap marked NPS)
NPSF Dryseal American National Standard Fuel Internal Straight Pipe Thread
NPSH American National Standard Straight Pipe Thread for Hose Couplings
NPSI Dryseal American National Standard Intermediate Internal Straight Pipe Thread
NPSL American National Standard Straight Pipe Thread Loose Fitting Mechanical Joints with
Locknuts
NPSM American National Standard Straight Pipe Thread for Free-Fitting Mechanical Joints for
Fixtures (Tap marked NPS)
NPT American National Standard Taper Pipe Thread (See ANPT, NPTR)
NPTF Dryseal American National Standard Taper Pipe Thread
NPTR American National Standard Taper Pipe Thread for Railing Joints (Taps marked NPT)
NS American National Thread - Special
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PTF Dryseal SAE Short Taper Pipe Thread
SGT Special Gas Taper Thread
SPL-PTF Dryseal Special Taper Pipe Thread
STI Screw Thread Insert Threads for Helical Coil Wire Inserts
*UN Unified Constant Pitch Thread Series
*UNC Unified Coarse Thread Series
*UNF Unified Fine Thread Series
*UNEF Unified Extra Fine Thread Series
UNJ Unified Thread Series with a 0.15011P to 0.18042P. Controlled Roil Radius on External
Thread only.
UNJC or UNJF Unified Thread Coarse or Fine Series with a 0.15011P to 0.18042P Controlled Root Radius on External Thread only.
UNM Unified Miniature Thread Series
UNR Unified Constant Pitch Thread Series with a 0.108P to 0.144P Controlled Root Radius;
External Thread only
UNRC or UNRF Unified Constant Pitch Coarse or Fine Thread Series with a 0.108P to 0.144P Controlled
Root Radius; Ext. Thread only
*UNS Unified Thread Special
V 60ยบ thread with Truncated Crest and Root. The theoretical "V" Form is usually flatted to
the user's specifications.
WHIT British Standard Whitworth Special Thread
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