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Threads commonly used in Piping

Piping thread standards.

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Thread Standards

Most piping threads are produced to national or industry group standards describing threads form - threads angle, pitch and diameter. Common standards are

ANSI/ASME B1.1-1989, Unified Inch Screw Threads (UN and UNR Thread Forms)
ANSI/ASME B1.20.1-1983 (R1992), Pipe Threads, General Purpose (Inch)
DIN 2999, Pipe threads for tubes and fittings - parallel internal thread and taper external thread
ISO 724 ISO general-purpose metric screw threads -- Basic dimensions

TPI/Pitch

In general pitch refers to threads per inch (TPI) for fractional screw threads and pipe threads. For metric screw threads pitch refers to the distance between threads.

Piping Threads

Common piping thread standards in the United States are

NPT - American Standard Pipe Taper Thread (also known as ANSI/ASME B1.20.1)
NPTF - National Pipe Thread Tapered Fine
NPTR - American Standard Taper Railing Pipe Thread

NPS - American National Standard Straight Pipe Thread
NPSC - American Standard Straight Coupling Pipe Thread
NPSM - American Standard Straight Mechanical Pipe Thread
NPSL - American Standard Straight Locknut Pipe Thread

Other common piping thread standards

ISO 7 Tapered Pipe Threads - also known as DIN 2999, BSP 21, JIS B0203
ISO 228 Parallel Pipe Threads - equivalent to DIN ISO 228/1, BSP PL, JIS B0202, G 1/8 and G 1/4 etc.
BS 21 BSP British standard pipe thread - Whitworth (withdrawn)

More about standards applied for piping threads .

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Related Topics

Dimensions - Sizes and dimensions of pipes and tubes, and their fittings - inside and outside diameter, weight and more.
Threads - Thread data - metric, unified, ACME and others.

Related Documents

ANSI B1.20.1 - NPS - American National Standard Straight Pipe Threads - NPS pressure tight straight pipe threads with lubricant or sealer.
ANSI B1.20.1 - NPT - American National Standard Taper Pipe Threads - NPT and NPTF pipe threads - dimensions according ANSI/ASME B1.20.1/3.
ASME B31 Pressure Piping - Overview - A survey of one of the most important pressure pipe codes - ASME B31, earlier known as ANSI B31.
British Standard Brass Threads - British Brass Thread is an imperial unit based screw thread.
British Standard Cycle Thread - British Standard Cycle is a British Imperial screw thread standard.
BS 21 - Pressure Tight Pipe Thread Joints - BSPT - British Standard Pipe Taper threads & BSP or BSPF - British Standard Pipe Parallel (Straight) threads.
EN 10226 - Pipe Threads where pressure tight joints are made on the threads - Dimensions - Pipe threads where pressure tight joints are made on the threads - Part 1: Taper external threads and parallel internal threads.
ISO - Pipe, Tube and Fittings Standards and Specifications - International Organization for Standardization - ISO - pipe, tube and fittings standards and specifications.
ISO 228 - Pipe Threads where Pressure Tight Joints are not made on the Threads - Requirements for thread form, dimensions, tolerances and designation for fastening pipe threads, thread sizes.
ISO 2841 - Spark Plugs Metric Threads - Metric threads spark plugs according ISO 28741.
ISO 7 - Pipe Threads where Pressure-tight Joints are made on the Threads - Pressure-tight joints made on the pipe threads.
ISO 724 - Metric Threads - Dimensions of metric threads according ISO 724.
Metric Bolts - Minimum Ultimate Tensile and Proof Loads - Minimum ultimate tensile and proof loads for metric bolts with coarse or fine threads.
NPT Threads - Taps and Drill Sizes - NPT - Briggs Standard Pipe threads - Taps and Drill Sizes.
Pipes - Fractional Equivalents - Fractional vs. decimal inches.
Standards Applied for Piping Threads - Applied threaded standards used for piping connections.
Whitworth Pipe Threads - BSPP (G) - British Standard Pipe Parallel and BSPT (R/Rp) – British Standard Tapered Pipe for pipes and tapered threads - G/R/Rp.
Withworth Threads - Taps and Drill Sizes - Taps and drill sizes used for Whitworth - ISO 7 and ISO 228 threads.

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