Thread Standards Used for Piping and Fluid Connectors
Thread designations and standards for threads used in piping and fluid connectors
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Straight Pipes Standards
NPSC - American Standard Straight Pipe Threads in Pipe Couplings Couplings
Applicable Standards
- ANSI B1.20.1 PIPE THREADS, GENERAL PURPOSE (INCH)
- FED-STD-H28/7 SCREW-THREAD STANDARDS FOR FEDERAL SERVICES SECTION 7 PIPE THREADS - GENERAL PURPOSE
NPSF - Dryseal American Standard Fuel Internal Straight Pipe Threads
Applicable Standards
- SAE J476 DRYSEAL PIPE THREADS
- ANSI B1.20.3 DRYSEAL PIPE THREADS (INCH)
- FED-STD-H28/8 SCREW-THREAD STANDARDS FOR FEDERAL SERVICES SECTION 8 DRYSEAL PIPE THREADS
NPSI - Dryseal American Intermediate Internal Straight Pipe Threads
Applicable Standards
- SAE J476 DRYSEAL PIPE THREADS
- ANSI B1.20.3 DRYSEAL PIPE THREADS (INCH)
- FED-STD-H28/8 SCREW-THREAD STANDARDS FOR FEDERAL SERVICES SECTION 8 DRYSEAL PIPE THREADS
NPSM - American Standard Straight Pipe Threads for Free-Fitting Mechanical Joints for Fixtures (these threads fit freely over NPTF threads. They are used in swivel nuts of 07 adapters)
Applicable Standards
- ANSI B1.20.1 PIPE THREADS, GENERAL PURPOSE (INCH)
- FED-STD-H28/7 SCREW-THREAD STANDARDS FOR FEDERAL SERVICES SECTION 7 PIPE THREADS - GENERAL PURPOSE
Taper Pipe Standards
ANPT - Aeronautical National Taper Pipe Threads
Applicable Standards
- MIL-P-7105 PIPE THREADS, TAPER, AERONAUTICAL NATIONAL FORM, SYMBOL ANPT, GENERAL REQUIREMENTS
NPT - American Standard Taper Pipe Threads for General Use
Applicable Standards
- ANSI B1.20.1 PIPE THREADS, GENERAL PURPOSE (INCH)
- FED-STD-H28/7 SCREW-THREAD STANDARDS FOR FEDERAL SERVICES SECTION 7 PIPE THREADS - GENERAL PURPOSE
NPTF - Dryseal American Standard Taper Pipe Threads
Applicable Standards
- SAE J476 DRYSEAL PIPE THREADS
- ANSI B1.20.3 DRYSEAL PIPE THREADS (INCH)
- FED-STD-H28/8 SCREW-THREAD STANDARDS FOR FEDERAL SERVICES SECTION 8 DRYSEAL PIPE THREADS
PTF - SAE Short - Dryseal SAE Short Taper Pipe Threads
PTF - SAE Short is mainly used in low pressure pneumatic and fuel applications.
Applicable Standards
- ANSI B1.20.3 DRYSEAL PIPE THREADS (INCH)
PTF SPL Short & SPL Extra Short - Dryseal Special Short Taper Pipe Threads
Are used in some pneumatic components where shortened thread depth is required because of size limitations.
Applicable Standards
- ANSI B1.20.3 DRYSEAL PIPE THREADS (INCH)
AWWA - American Water Works Association
- ANSI/AWWA C800-05 UNDERGROUND SERVICE LINE VALVES AND FITTINGS
Unified Thread Standards
UN - Unified Constant Pitch Threads (standard series: 4, 6, 8, 12, 16, 20, 28, 32)
Applicable Standards
- ASME B1.1 UNIFIED INCH SCREW THREADS (UN & UNR THREAD FORM)
-
FED-STD-H28/2 SCREW-THREAD STANDARDS FOR FEDERAL SERVICES SECTION 2 UNIFIED INCH SCREW THREADS-UN AND UNR THREAD FORMS
UNC - Unified Coarse Threads
Applicable Standards
- ASME B1.1 UNIFIED INCH SCREW THREADS (UN & UNR THREAD FORM)
- FED-STD-H28/2 SCREW-THREAD STANDARDS FOR FEDERAL SERVICES SECTION 2 UNIFIED INCH SCREW THREADS-UN AND UNR THREAD FORMS
UNEF - Unifed Extra Fine Threads
Applicable Standards
- ASME B1.1 UNIFIED INCH SCREW THREADS (UN & UNR THREAD FORM)
- FED-STD-H28/2 SCREW-THREAD STANDARDS FOR FEDERAL SERVICES SECTION 2 UNIFIED INCH SCREW THREADS-UN AND UNR THREAD FORMS
UNF - Unified Fine Threads
Applicable Standards
- ASME B1.1 UNIFIED INCH SCREW THREADS (UN & UNR THREAD FORM)
- FED-STD-H28/2 SCREW-THREAD STANDARDS FOR FEDERAL SERVICES SECTION 2 UNIFIED INCH SCREW THREADS-UN AND UNR THREAD FORMS
UNS - Unified Special Pitch Threads
Applicable Standards
- ASME B1.1 UNIFIED INCH SCREW THREADS (UN & UNR THREAD FORM)
- SCREW-THREAD STANDARDS FOR FEDERAL SERVICES-SEC. 3
UNJ - Unified Controlled Root Radius Threads
Applicable Standards
- ANSI B1.15 UNIFIED INCH SCREW THREADS (UNJ THREAD FORM)
- FED-STD-H28/4 SCREW-THREAD STANDARDS FOR FEDERAL SERVICES SECTION 4 CONTROLLED RADIUS ROOT SCREW THREADS, UNJ SYMBOL
Metric Thread Standards
M - Metric Screw Threads M profile
Applicable Standards
- ISO 261 ISO GENERAL PURPOSE METRIC SCREW THREADS - GENERAL PLAN
- ASME B1.13M METRIC SCREW THREADS: M PROFILE
- FED-STD-H28/21 METRIC SCREW-THREADS
M Keg Metric Taper Threads
Mainly used in Germany.
Applicable Standards
- DIN 158-1 METRIC EXTERNAL TAPER SCREW THREADS AND MATING INTERNAL PARALLEL SCREW THREADS - PART 1. NOMINAL SIZES, LIMIT DEVIATIONS, LIMITS OF SIZE AND VERIFICATION
- DIN 158-2 METRIC EXTERNAL TAPER SCREW THREAD AND MATING INTERNAL PARALLEL SCREW THREADS - PART 2. GAUGING SYSTEM, USE OF GAUGES, CALCULATION OF GAUGE DIMENSIONS AND GENERAL FEATURES
BSi - British Standards
R (BSPT) - British Standard Taper Pipe Threads, External
Applicable Standards
- BS 21 PIPE THREADS FOR TUBES AND FITTINGS WHERE PRESSURE-TIGHT JOINTS ARE MADE ON THE THREADS (METRIC DIMENSIONS)
- ISO 7/1 PIPE THREADS: DESIGNATION, DIMENSIONS/TOLERANCES
Rc (BSPT) - British Standard Taper Pipe Threads, Internal
Applicable Standards
- BS 21 PIPE THREADS FOR TUBES AND FITTINGS WHERE PRESSURE-TIGHT JOINTS ARE MADE ON THE THREADS (METRIC DIMENSIONS)
- ISO 7/1 PIPE THREADS: DESIGNATION, DIMENSIONS/TOLERANCES
Rp or G (BSPP) - British Standard Pipe (Parallel) Threads
Applicable Standards
- BS 2779 PIPE THREADS FOR TUBES & FITTINGS WHERE PRESSURE-TIGHT JOINTS ARE NOT MADE ON THE THREADS (METRIC DIMENSIONS)
- ISO 228/1 PIPE THREADS PT 1: DESIGNATION, DIMENSIONS, TOLERANCE
Japanese Standards
PF - JIS Parallel Pipe Threads
PF threads are functionally interchangeable with BSPP. This is an old designations replaced with G.
Applicable Standards
- JIS B 202 PARALLEL PIPE THREADS
- ISO 228/1 PIPE THREADS PT 1: DESIGNATION, DIMENSIONS, TOLERANCE
PT - JIS Taper Pipe Threads
PT threads are functionally interchangeable with BSPT threads. This is an old designations replaced with and R and Rc.
Applicable Standards
- JIS B 0203 TAPER PIPE THREADS
- ISO 7/1 PIPE THREADS: DESIGNATION, DIMENSIONS/TOLERANCES
PS - JIS Parallel Internal Pipe Threads (to mate with PT threads)
Applicable Standards
- JIS B 0203 TAPER PIPE THREADS
More about pipe thread standards.
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