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Pressure-tight joints made on the pipe threads

The standard ISO 7 - Pipe threads where pressure-tight joints are made on the threads consists of

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• ISO 7-1:1994 Dimensions, tolerances and designation
• ISO 7-2:2000 Verification by means of limit gauges

The ISO 7 tapered Whitworth threads are equivalent to DIN 2999, BS 21 (BS EN 10226-1), JIS B0203.

Characteristics of ISO 7 tapered Withworth threads are Maxon cinema 4d studio r21 026 for mac free download.

• tapered thread 1^o47'
• truncation of roots and crests are rounded
• 55^o thread angle
• pitch is measured in threads per inch

Note!

There is a distinction between

• jointing threads - sealing tapered/cylindrical threads for connections according to ISO 7-1 and/or EN 10226-1, BS 21
• fastening threads - not sealing parallel cylindrical threads for connections according to EN ISO 228-1

Diameter and pitches are the same for ISO 7-1 and ISO 228 threads.

ISO 7-1 is BSPT (R/Rp) – British Standard Tapered Pipe where

• R - tapered male with external threads
• Rp - cylindrical female with internal threads
• Rc - tapered male with internal threads

G-threads have a parallel shape in accordance with the DIN-EN-ISO 228-1 standard.

Both female Rp - internal cylindrical threads - and Rc - internal taper threads - are used in combination with male R - external threads - to make sealed joints. Male G-threads (parallel) can only be screwed into female G-threads.
Male R-threads (tapered) can be screwed into female G or R-threads.

For full table with Thread Tolerances - rotate the screen!

The outside diameter of a pipe or fitting must be measured and compared to a table for size identification. A 3/4' ISO 7-1 pipe thread has an outside diameter - OD - of 1.060 inches. Each thread size has a defined number of threads per inch - TPI, or pitch. The 3/4' NPT pipe thread has 14 threads per inch. Both the TPI and OD of the thread are required for positive identification of thread size because more than one size have the same TPI.

ISO 7-1 threads may look similar to NPT threads. However, ISO and NPT threads should not be mixed. ISO threads have 55^o taper angle versus 60^o for NPT. The NPT root and crest configurations are also different from ISO. For ISO threads pitch is usually measured in millimeters ( may be expressed in Inch). The pitch are different.

Length of ISO 7-1 Thread to make a Tight Joint

DIN 2999 is the German version of BS 21 and BS 2779 which were the original British Whitworth screw thread pipe joint standards. DIN 2999 has been withdrawn, is obsolete and has been replaced with ISO 7 and ISO 228.

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

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• 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
• British Standard Brass - 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 724 - Metric Threads - Dimensions of metric threads according ISO 724
• NPT Threads - Taps and Drill Sizes - NPT - Briggs Standard Pipe threads - Taps and Drill Sizes
• Screws - Metric vs. Inches - Metric versus Imperial equivalent screw dimensions
• Standards Applied for Piping Threads - Applied threaded standards used for piping connections
• Threads commonly used in Piping - Piping thread standards
• UNC and UNF - Unified Inch Screw Threads - ANSI/ASME B1.1 Unified National Thread - UNC Coarse series and UNF Fine series
• 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

Tag Search

• en: iso 7/1 threads
• es: iso 7.1 roscas
• de: iso 1.7 Themen

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• 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
• British Standard Brass - 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 724 - Metric Threads - Dimensions of metric threads according ISO 724
• NPT Threads - Taps and Drill Sizes - NPT - Briggs Standard Pipe threads - Taps and Drill Sizes
• Screws - Metric vs. Inches - Metric versus Imperial equivalent screw dimensions
• Standards Applied for Piping Threads - Applied threaded standards used for piping connections
• Threads commonly used in Piping - Piping thread standards
• UNC and UNF - Unified Inch Screw Threads - ANSI/ASME B1.1 Unified National Thread - UNC Coarse series and UNF Fine series
• 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

Tag Search

• en: iso 7/1 threads
• es: iso 7.1 roscas
• de: iso 1.7 Themen

Stocks: Real-time U.S. stock quotes reflect trades reported through Nasdaq only; comprehensive quotes and volume reflect trading in all markets and are delayed at least 15 minutes. International stock quotes are delayed as per exchange requirements. Fundamental company data and analyst estimates provided by FactSet. Copyright 2020© FactSet Research Systems Inc. All rights reserved. Source: FactSet

Indexes: Index quotes may be real-time or delayed as per exchange requirements; refer to time stamps for information on any delays. Source: FactSet

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Stock Movers: Gainers, decliners and most actives market activity tables are a combination of NYSE, Nasdaq, NYSE American and NYSE Arca listings. Sources: FactSet, Dow Jones Selection pane powerpoint mac 2019.

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