GB/T 12716-2011 PDF English
US$115.00 · In stock · Download in 9 secondsGB/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 procedureStatus: Valid GB/T 12716: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 12716-2011 | English | 115 |
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Pipe threads with the thread angle of 60 degrees where pressure-tight joints are made on threads
| Valid |
| GB/T 12716-2002 | English | 519 |
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4 days
|
Pipe threads with the thread angle of 60 degrees where pressure-tight joints are made on the threads
| Obsolete |
| GB/T 12716-1991 | English | 679 |
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5 days
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Taper pipe threads with 60 degree
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 12716-2011
GB/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 Contents
Foreword... 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... 16
1 Scope
This 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 References
The 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 – Vocabulary
3 Terms and Codes
3.1 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 Form
4.1 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 Conjunction
The 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 Length
The 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 / mm
9 Chamfer and Theoretical Position of Datum Plane
For the chamfer on the small end-face of male thread, the theoretical position of its
datum plane shall be unchanged, see Figure 5a).
10 Marking
10.1 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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