ASME B1.20.2M-2006 pdf download

ASME B1.20.2M-2006 pdf download.Pipe Threads, 60 deg, General Purpose.
1 SCOPE L 4 p overall length of thread, including vanish This Standard specifies the designations, dimensions, and tolerances and establishes a verification system for 60 deg included angle pipe threads. It is applicable for general purpose pipe and fitting connections. Where pressure-tight joints are required, it is intended that thread, external thread L 5 p length of complete threads, external thread V p vanish thread(s), allowance for chamfer on tool- ing or other process of thread production taper pipe threads conforming to this Standard be made 3 TAPER PIPE THREAD FORM up wrench-tight with a sealant. To prevent galling on certain piping materials such as stainless steel, the seal- ant should contain a lubricant. Internal parallel (straight) pipe threads, series NPSC, are used with external taper pipe threads, series NPT. Internal taper pipe threads, series NPT, are used with external taper pipe threads, series NPT. 3.1 Thread Profile The form of thread profile specified in this Standard shall be known as the Standard Taper Pipe Thread Form. The relations as specified herein for form of thread and general notation are shown in Fig. 2. 3.2 Angle of Thread 2 REFERENCE AND SYMBOLS The angle between the sides of the thread is 60 deg when measured in an axial plane. The line bisecting this 2.1 Reference Standard The following publication is referenced in this Stan- dard. The latest edition shall apply. ASME B1 .20.1 , Pipe Threads, General Purpose (Inch) Publisher: The American Society of Mechanical Engineers (ASME), Three Park Avenue, New York, NY 1 001 6-5900; Order Department: 22 Law Drive, P.O. Box 2300, Fairfield, NJ 07007-2300 2.2 Symbols The following symbols are used (see Fig. 1 ): D p outside diameter of pipe E 0 p basic pitch diameter at small end of external thread (or end of pipe) E 1 p basic pitch diameter at plane of hand-tight engagement length ( L 1 ), external thread, large end of internal thread E 2 p basic pitch diameter at plane of effective thread length ( L 2 ), external thread E 3 p basic pitch diameter at plane of wrench-tight engagement E 5 p basic pitch diameter at L 5 K 0 p basic minor diameter at small end of external thread (or end of pipe) L 1 p length of hand-tight engagement between internal and external threads L 2 p length of effective thread, external thread L 3 p length of thread beyond L 1 allowing wrench-tight engagement, internal thread; also wrench makeup 1 angle is perpendicular to the axis. 3.3 Truncation and Thread Height The height, H , of the sharp V thread is H p 0,866025 P where P p pitch of thread The basic maximum height of the truncated thread, h , (see Fig. 2) is based on factors entering into the manufac- ture of cutting tools and the making of tight joints. Maximum h p 0,800000 P The crest and root of pipe threads are truncated a minimum of 0,033000 P . The maximum depth of trunca- tion for the crest and root of these pipe threads will be found in Table 1 . The crest and roots of external and internal threads may be truncated either parallel to the pitch line or parallel to the axis. The illustration in Fig. 2, giving a sectional view of this standard thread form, represents the truncated thread form by a straight line. However, when closely examined, the crests and roots of commercially manufac- tured pipe threads appear slightly rounded. When crests and roots of threading tools or chasers lie within the limits shown in Table 1 , the pipe threads of products produced by such means are acceptable on the basis of in-process control.