GB/T 12716-2011 PDF EnglishUS$115.00 · In stock · Download in 9 seconds
GB/T 12716-2011: Pipe threads with the thread angle of 60 degrees where pressure-tight joints are made on threads Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 12716: Historical versions
Similar standardsGB/T 12716-2011: Pipe threads with the thread angle of 60 degrees where pressure-tight joints are made on threads---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT12716-2011 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 21.040.20 J 04 Replacing GB/T 12716-2002 Pipe Threads with the Thread Angle of 60 Degrees Where Pressure-Tight Joints are Made on Threads Issued on. DECEMBER 30, 2011 Implemented on. OCTOBER 01, 2012 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of PRC. Table of ContentsForeword... 3 1 Scope... 5 2 Normative References... 5 3 Terms and Codes... 5 4 Thread Form... 6 5 Thread Type and Conjunction... 8 6 Basic Size and Tolerance of Cylinder Pipe Thread (NPT)... 9 7 Basic Size and Tolerance of Cylinder Female Thread (NPSC)... 11 8 Effective Thread Length... 12 9 Chamfer and Theoretical Position of Datum Plane... 13 10 Marking... 14 11 Thread Inspection... 15 Appendix A (Informative) Thread Working Gauge... 161 ScopeThis Standard specifies the thread form, basic size, tolerance, marking and gauge of pipe thread (NPT and NPSC) with sealed thread pair and thread form angle of 60°. This Standard is applicable to sealed thread connection for pipe, valve, pipe joint, cock, and other pipe fittings.2 Normative ReferencesThe following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document. GB/T 14791 Screw Threads – Vocabulary3 Terms and Codes3.1 Terms and definitions The following terms and definitions and those ones stipulated in GB/T 14791 are applicable to this document. 3.1.1 Reference plane The visible plane of reference workpiece for reading the inspection values (position deviation of the datum plane) during using the gauge to inspect the thread. It is the outer end-face of female thread and small end-face of male thread.4 Thread Form4.1 Design of thread form See Figure 1 for thread form of cylinder female thread (NPSC); see Figure 2 for thread from of cylinder thread (NPT). 4.2 Size of thread form The size of thread form shall be calculated as per the following formula. 4.3 Tolerance of thread height The distribution positions of tolerance zones for thread crest height and thread root height can refer to Figure 3; while the tolerance value shall be consistent with the provisions of Table 1.5 Thread Type and ConjunctionThe female thread can be divided into the taper and cylinder threads; while the male thread only has the taper thread.6 Basic Size and Tolerance of Cylinder Pipe Thread (NPT)6.1 Basic dimension The distribution position of main size of cylinder pipe thread can refer to Figure 4; the basic size shall conform to the provisions of Table 2. 6.3 Integrated position tolerance The taper pipe thread (NPT) datum plane axial position limit deviation. ±1P. 6.4 Tolerance between major and minor diameters In the same axial position plane, the sizes of the thread major and minor diameters shall be changed as the change of the pitch diameter; so that ensure the sizes of thread crest height and thread root height shall be within the tolerance range specified in Clause 4. 6.5 Single element tolerance of thread The conical degree, lead and flank angle limit deviation of taper pipe thread (NPT) shall comply with the provisions of Table 3.7 Basic Size and Tolerance of Cylinder Female Thread (NPSC)7.1 Basic size The basic sizes of the major diameter, pitch diameter and minor diameter of cylinder Limit Deviation of Pitch Diameter 7.3 Integrated position tolerance The limit deviation for axial position of cylinder female thread (NPSC) datum plane. ±1.5P. 7.4 Tolerance between major diameter and minor diameter In the same axial position plane, the sizes of thread major and minor diameters shall be changed as the change of pitch diameter; so that ensure the sizes of thread crest and thread root shall be within the tolerance range specified in Clause 4.8 Effective Thread LengthThe effective thread length of male thread shall be no less than the sum between the Thread Size Code Number of Teeth Pitch Diameter / mm Minor Diameter / mm9 Chamfer and Theoretical Position of Datum PlaneFor the chamfer on the small end-face of male thread, the theoretical position of its datum plane shall be unchanged, see Figure 5a).10 Marking10.1 Marking methods The pipe thread marking consists of thread feature code, thread size code and thread number of teeth. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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