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08-2015TYPESOFTHW.TEEADWREWSING.COMTYPE OF THREAD 1

ABOUT TEESINGINDEXWE ENGINEER FROM SOURCE TO PROCESSTECHNICAL SUPPLIER SINCE 1952Since 1952 Teesing is The right connection as the international supplier offittings, valves, tubing, systems and assemblies for industrial applications in foursectors: pneumatics, hydraulics, instrumentation and transport of media. Withoffices in the Netherlands (Rijswijk), U.S.A. (New Jersey), China (Beijing) andZhubei City (Taiwan) we are globally active in several specialized niche markets,such as semiconductor, railway, alternative fuels, pharmaceutical and (Petro)chemical industries.We supply a complete package of products and services you require for yourconnection applications. Through our specialized knowledge of our products andmarkets we are capable in responding quickly to all your questions regarding thetransport of gases and liquids to your point of use connection. Thanks to ourengineering department we are also capable of delivering customized productsand assemblies that are developed to meet the specifications of your criticalprocess demands.OUR BUSINESS UNITSBASICS OF THREAD1.BASICS OF THREAD1.1Gender41.2Handedness41.3Design41.4Pitch / TPI51.5Diameter51.6Angle51.7Crest / root52.MOST COMMON THREADS2.1M - ISO thread (metric)72.2NPT - Pipe thread82.3G/R/Rp - Whitworth thread (BSPP/BSPT)9INDUSTRIAL APPLICATIONSSUBMICRON TECHNOLOGIESALTERNATIVE ENERGY2.4UNC/UNF - Unified National threadInternational supplier offittings, valves, tubing,systems and assemblies.International supplier of HP/UHP components and assemblies from source to process.International supplier of components, systems and assemblies for CNG/H2 projects.2.5Extra: Comparison sheet (M – BSPP – BSPT – NPT – UNC - UNF)3.FREQUENTLY ASKED QUESTIONS1011-153.1.1 How to identify thread types?163.1.2What does NPTF stand for: Female, Fine or fuel?163.1.3Which female threads are tapered/conical?3.1.4What is the difference between G-thread (BSPP) and R-thread (BSPT)?3.1.5Can I use an o-ring sealing with NPT thread?183.1.6Are NPT and BSP Pipe threads compatible?191616-183.1.7What is screw/nut galling and how can it be avoided?193.1.8What kind of sealing method is recommended when mounting a PA/PVDF19fitting with male taperd thread into a metal counterpart?3.1.9What kind of a thread does a Jic-fitting have?203.2THREAD SEAL TYPES20Appendix: Conversion factor21Appendix: Other threads22-23 Teesing BV, Aug 2015. Versie 030815All technical and other data contained in this catalogue may be subject to change without notice.The contents of this document have been written with the greatest possible care. However, Teesingcannot guarantee the accuracy or completeness of the information provided in this brochure.2 TEESINGTYPE OF THREAD 3

1. BASICS OF THREAD1.1 GENDEREvery matched pair of threads, external andinternal, can be described as male and female.For example, a screw has male thread, while thematching hole has female thread.1. BASICS OF THREAD1.4External thread(Male)Internal Thread(Female)1.5Threads perInch TPIDIAMETER:The major diameter is determined by the thread tips.The minor diameter is determined by the groove of the thread.The pitch diameter is the distance of two opposite flanks or the distance of the centreline ofthe profile.1.2 HANDEDNESSThe helix of a thread can twist in two possibledirections. Most threads are oriented so thatthe threaded item when seen from a point ofview on the axis through the center of the helix,moves away from the viewer when it is turned in aclockwise direction, and moves towards the viewerwhen it is turned counter clockwise.PitchDepthMinordiameterBy common convention, right-handedness is thedefault handedness for screw threads. Therefore,most threaded parts and fasteners have righthanded threads.Right-handLeft-handMajordiameterPitch diameter1.6ANGLEThe flank angle is the angle between the flank of a screw thread and the perpendicular to the axis of thescrew. Tapered threads have a taper angle. This is the angle between the taper and the centre axis of thepipe.Flankangle1.3 DESIGNThe type of thread can be identified by the following characteristics.ParallelPITCH/TPI:The pitch is the distance from the crest of one thread to the next inmm.TPI (Threads per inch) is used by inch thread.Tapered1 47 Taper angle1.7CREST/ROOTThe outer-most part of the thread is called crest, the inner-most part of thethread is called root.4 TEESINGTYPE OF THREAD 5

2. MOST COMMON THREADS2.1 M - ISO THREAD (METRIC)MMCoarse ThreadFine Thread2.1ISO Metric thread is a globally standardized thread. Compared to standard threads (coarsethread), a fine thread has a smaller pitch.ANSI B1.20.1ANSI B1.20.3Coarse Thread2.3 G/R/RP - WHITWORTH THREAD (BSPP/BSPT)GR/Rp/Rc BSPP BSPTISO 228 (DIN 259)ISO 7 (DIN 2999 replaced by EN10226)2.4 UNC/UNF - UNIFIED NATIONAL THREADUNCUNFM - ISO THREAD (METRIC)ISO 724 (DIN 13-1)ISO 724 (DIN 13-2 to 11)2.2 NPT - PIPE THREADNPTNPTF2. MOST COMMON THREADSANSI B1.1ASNI B1.12.5 EXTRA: COMPARISON SHEET (M – BSPP – BSPT – NPT – UNC - UNF)pitch can be displayed or omitted after thread sizeFine Threadpitch must be displayed after thread sizeThread size(mm)Majordiameter(mm)Minordiameter(mm)Pitch (mm)Thread size(mm)Majordiameter(mm)Minordiameter(mm)Pitch (mm)M32,982,4590,5M 3 x 0,352,9812,6210,35M43,9783,2420,7M 4 x 0,53,9783,2420,5M54,9764,1340,8M 5 x 0,54,984,4590,5M65,9744,9171M 6 x 0,755,9785,1880,75M87,9746,9171M 8 x 0,757,9787,1880,75M 10 x 0,759,9789,1880,75M 10 x 19,9748,9171M 10 x 1,259,9728,6471,25M 12 x 111,9710,9171M 10M 12M 16M 20M 20,7521,51,7522,53M 12 x 1,2511,9710,6471,25M 12 x 1,511,9710,3761,5M 16 x 115,9714,9171M 16 x 1,515,9714,3761,5M 20 x 119,9718,9171M 20 x 1,519,9718,3761,5M 20 x 219,9617,8352M 24 x 1,023,9722,9171,0M 24 x 1,523,9722,3761,5The flank angle is 60 .Female and Male thread are both parallel.6 TEESINGTYPE OF THREAD 7

2. MOST COMMON THREADS2.2 NPT - PIPE THREAD2. MOST COMMON THREADS2.3The most common types of pipe thread are: NPT - American Taper Pipe Thread National Pipe Taper NPTF - American Taper Pipe Thread for Dryseal joint without sealant compound National Pipe Taper FuelG/R/RP - WHITWORTH THREAD (BSPP/BSPT)The most common types of whitworth thread are: BSPP (G) – British Standard Pipe Parallel BSPT (R/Rp) – British Standard Tapered Pipe, for pipes and tapered thread.An appropriate sealing compound can be used in the thread to ensure a leak-proof joint.BSPP (G)NPT and NPTF appear to be identical. Both have the same pitch diameter at the top of the hole ofthe internal thread or end of the pipe on external threads and both have the same thread lengthsor depths. However, there is a subtle difference in the root and crest diameters of the threads.NPT / NPTFThread sizeMajor Diameter (mm)TPI1/16” – 27 NPT7,938271/8” – 27 NPT10,287271/4” – 18 NPT13,716183/8” – 18 NPT17,145181/2” – 14 NPT21,336143/4” – 14 NPT26,670141” – 11 ½ NPT33,4012” – 11 ½ NPT60,325Thread size (inch)Major Diameter (mm)Minor Diameter (mm)TPIG 1/16”7,7236,56128G 1/8”9,7288,56628G 1/4”13,15711,44519G 3/8”16,66214,95019G 1/2”20,95518,63114G 3/4”26,44124,11714G 1”33,24930,29111G 2”59,61456,65611BSPT (R/Rp)Female Thread size Major Diameter(inch)(mm)Minor FemaleDiameter (mm)TPI11,5Male Thread size(inch)11,5R 1/16”Rp 1/16”6,49028The flank angle is 60 .Female and Male thread are both tapered with equal angles.7,723R 1/8”Rp 1/8”9,7288,49528R 1/4”Rp 1/4”13,15711,34119R 3/8”Rp 3/8”16,66214,84619R 1/2”Rp 1/2”20,95518,48914R 3/4”Rp 3/4”26,44123,97514R 1”Rp 1”33,24930,11111R 2”Rp 2”59,61456,47611The flank angle is 55 .BSPP: Female and Male thread are both parallel.BSPT: Female thread is parallel and male thread is tapered.- Female thread can also be tapered: Rc, but this is not common.BSPPBSPTNPT threads are also sometimes referred to as: MIP (Male Iron Pipe) FIP (Female Iron Pipe) IPT (Iron Pipe Thread) FPT (Female Pipe Thread) MPT (Male Pipe Thread)Note that these references are somewhat casual, and might possibly be used in reference to NPS instead ofNPT Thread. NPS thread –National Pipe Straight- is not interchangeable with NPT thread.8 TEESINGTYPE OF THREAD 9

2. MOST COMMON THREADS2.4 UNC/UNF - UNIFIED NATIONAL THREAD2. MOST COMMON THREADS2.5The most common types of UN (Unified National) thread are: UNC – Unified National Coarse Thread, comparable with the ISO metric thread. UNF – Unified National Fine Thread.*Compared to standard threads (coarse thread), a fine thread has a smaller pitch.Unified threads come in three different classes:1A (external) & 1B (internal): for applications where a liberal tolerance is required to permit easyassembly even with slightly nicked threads.2A (external) & 2B (internal): most commonly used class for general applications3A (external) & 3B (internal): for applications where closeness of fit and/or accuracy of threadelements are important.EXTRA: COMPARISON SHEET (M – BSPP – BSPT – NPT – UNC - UNF)UNC (2A)Metric:Standard/FineInch:BSPP (G)BSPT allelFlank angle60 55 55 60 60 Thread angle0 0 1 47’1 47’0 Seal locationO-ring/ Gasket/ConeO-ring/ Gasket/ConeOn threadsOn threadsO-ring/ Gasket/ConeBSPP (G)BSPT (R/Rp)NPTUNCUNF7,7237,7237,938Major Diameter (mm):UNC (2A)Nominal DiameterMajor Diameter (mm)Minor Diameter (mm)TPI1/16”1/4” x 20 UNC6,3224,978201/8”9,7289,72810,2875/16” x 18 /8” x 16 /16” x 14 671/2” x 13 0125/8” x 11 43/4” x 10 �� x 9 UNC22,17619,17791” x 8 UNC25,34921,97182” x 4,5 UNC50,72644,6794,5BSPP (G)BSPT (R/Rp)UNCUNF1/16”6,5616,4901/8”8,5668,495UNF (2A)Minor Diameter (mm):Nominal DiameterMajor Diameter (mm)Minor Diameter (mm)TPI1/4”11,44511,3414,9785,3601/4” x 28 UNF6,3255,360283/8”14,95014,8467,7988,3825/16” x 24 � x 24 �� x 20 UNF11,0799,728201”30,29130,11121,97123,1141/2” x 20 UNF12,66711,328202”56,65656,47644,679-5/8” x 18 UNF15,83914,351183/4” x 16 UNF19,01217,323167/8” x 14 UNF22,18420,26914UNCUNF1” x 12 UNF25,35423,11412The flank angle is 60 .Female and Male thread are both parallel.10 TEESINGTPI (Treads per inch):BSPP (G)BSPT ��111111,58122”111111,54,5TYPE OF THREAD 11

2. MOST COMMON THREADSMale threadD (mm)Male threadpitch (mm) TPI (threadsper inch)9,739,9728Metric fineNPTUN/JIC/SAE(Thread class 0 UNF1/41/41,5D (mm)pitch (mm) TPI (threadsper inch)29,961,5M30x1,529,962M30x230,167/16-20 UNF1,513,1613,97BSP (BSPP &BSPT)110,2911,972. MOST COMMON 85/8-18 M20x1,520,961421,34141/27/8-14 UNF1,5M24x1,5121-12 UN1,5M26x1,526,441426,671423/43/4M27x2121 1/16-12 UN26,99161 1/16-16 UN12 TEESING1 5/8-12 UN1 1/41,5M42x1,541,962M42x242,1611,51 1/4121 11/16-12 UN44,961,5M45x1,544,962M45x247,631247,80111 7/8-12 UN1 1/22M48x248,2611,550,80121 1/22-12 1,522,2325,9713/16-16 UNF1 7/16-12 UN1,542,863/4-16 UNF1,51623,9711/16-16 UN1620,6421,973/81,519,0519,973/81 5/16-12 UN1M36x29/16-18 UNFM16x1,51236,512UN/JIC/SAE(Thread class 2)M33x2181,5NPT1 3/16-12 UN214,2915,97Metric fine1233,2535,96BSP (BSPP &BSPT)222 1/2-12 UNM65x2TYPE OF THREAD 13

2. MOST COMMON THREADSFemale threadD (mm)Female threadpitch (mm) TPI (threadsper inch)8,54278,57288,92Metric fineNPTUN/JIC/SAE(Thread class 2)1/81/87/16-20 11M33x2M36x21236,3814,35185/8-18 1,51617,90141,5M38x1,51 1/41 1/41 5/8-12 UN2M42x211/16-16 UN40,381,5M42x1,53/4-16 UNF42,842M45x243,381,5M45x1,540,561/21,51 7/16-12 UN39,84M18x1,517,3218,383/81 5/16-12 UN29/16-18 544,85111218,631418,921613/16-16 UN45,3420,27147/8-14 UNF45,841 11/16-12 UN1 1/21 1/21 7/8-12 ,6924,8425,2714 TEESING1-12 UNF3/43/4M26x1,51221 1/16-12 UN1256,661157,6311,561,211262,842UN/JIC/SAE(Thread class 2)M30x1,5181,5NPT1 3/16-12 UN1,512,7514,38Metric fine1211,533,84BSP (BSPP &BSPT)M30x229,1530,841/2-20 UNF1,5pitch (mm) TPI (threadsper inch)28,38201,5D (mm)27,86M10x111,0712,38BSP (BSPP &BSPT)19,7310,382. MOST COMMON THREADS2-12 UN222 1/2-12 UNM65x2M27x2161 1/16-16 UNTYPE OF THREAD 15