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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

• 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

• 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.

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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!

ISO 7-1 Tapered Threads
Pipe Size (inches)	Threads per Inch P (TPI)	Lead p (mm)	Outside Diameter d = D (mm)	Pitch Diameter d2 = D2 (mm)	Minor Diameter d1 = D1 (mm)	Rp/Rc R	a	Tolerances of Internal Thread		Tolerances of External Thread
							(mm)	Pitch Diameter (mm)	turns	turns	(mm)
1/16	28	0.907	7.723	7.142	6.561	1/16	4	± 0.071	± 1 1/4	± 1	± 0.9
1/8	28	0.907	9.23	9.147	8.566	1/8	4	± 0.071	± 1 1/4	± 1	± 0.9
1/4	19	1.337	13.157	12.301	11.445	1/4	6	± 0.104	± 1 1/4	± 1	± 1.3
3/8	19	1.337	16.662	15.806	14.950	3/8	6.4	± 0.104	± 1 1/4	± 1	± 1.3
1/2	14	1.814	20.955	19.793	18.631	1/2	8.2	± 0.142	± 1 1/4	± 1	± 1.8
5/8	14	1.814	22.911	21.749	20.587
3/4	14	1.814	26.441	25.279	24.117	3/4	9.5	± 0.142	± 1 1/4	± 1	± 1.8
7/8	14	1.814	30.201	29.039	27.877
1	11	2.309	33.249	31.770	30.291	1	10.4	± 0.18	± 1 1/4	± 1	± 2.3
1 1/8	11	2.309	37.897	36.418	34.939
1 1/4	11	2.309	41.910	40.431	38.952	1 1/4	12.7	± 0.18	± 1 1/4	± 1	± 2.3
1 1/2	11	2.309	47.803	46.324	44.845	1 1/2	12.7	± 0.18	± 1 1/4	± 1	± 2.3
1 3/4	11	2.309	53.746	52.267	50.788
2	11	2.309	59.614	58.135	56.656	2	15.9	± 0.18	± 1 1/4	± 1	± 2.3
2 1/4	11	2.309	65.710	64.231	62.752
2 1/2	11	2.309	75.184	73.705	72.226	2 1/2	17.5	± 0.216	± 1 1/2	± 1 1/2	± 3.5
2 3/4	11	2.309	81.534	80.055	78.576
3	11	2.309	87.884	86.405	84.926	3	20.6	± 0.216	± 1 1/2	± 1 1/2	± 3.5

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

Nominal Pipe Size (inches)	Length of Thread (inches)
1/8	0.27
1/4	0.39
3/8	0.41
1/2	0.53
3/4	0.55
1	0.66
1 1/4	0.68
1 1/2	0.68
2	0.70
2 1/2	0.93
3	1.02
4	1.09
5	1.19
6	1.21

Izotope iris 2 v2 02 download free. 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

• 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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