Gauges for pipe threads with 55 degree thread angle where pressure-tight joints are not made on the threads
1 Scope
This standard specifies the tolerance, requirements, acceptance and inspection, marking and packaging of gauges for pipe threads with 55 degree thread angle where pressure-tight joints are not made on the threads.
The thread gauges specified in this standard are applicable to the inspection of pipe threads with 55 degree thread angle where pressure-tight joints are not made on the threads specified in GB/T 7307-2001.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 7307-2001 Pipe threads with 55 degree thread angle where pressure-tight joints are not made on the threads (eqv ISO 228-1: 1994)
3 Symbols and explanations
For the purposes of this standard, the symbols and explanations listed in Table 1 apply.
Table 1
Foreword i
1 Scope
2 Normative references
3 Symbols and explanations
4 Codes, functions, characteristics, rules of use and controls of thread gauges
5 Entry of the thread
6 Threaded gauges for the external thread of workpiece
7 Gauges for inspecting the internal thread of workpieces
8 Formulas for calculating the dimensions of thread gauge
9 Requirements
10 Acceptance and inspection
11 Marking and packaging
Annex A (Informative) Smooth limit gauge
Annex B (Normative) Dimension calculation formula of thread gauge
