JB/T 10031-2019Gauges for 55° sealing pipe threads (English PDF)

National Standard of the People's Republic of China

Replacing

JB/T 10031-1999

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

Contents

• 1 Scope
• 2 Normative references
• 3 Terms and definitions
• 4 Symbols and their explanation
• 5 Classification and marking
• 5.1 Classification
• 5.2 Marking
• 6 Thread form
• 6.1 Full thread form
• 6.2 Truncated thread form
• 6.3 Offset S
• 7 Types of construction and dimensions
• 7.1 Working plug gauge for full form taper threads
• 7.2 Working ring gauge for full form taper threads
• 7.3 Setting plug gauge for truncated form taper threads
• 7.4 Plain taper ring gauge
• 7.5 Plain taper plug gauge
• 8 Design
• 8.1 Diameter tolerance on the gauge plane
• 8.2 Pitch tolerance, limit deviations of the taper and limit deviations of the half angle of the thread flank
• 8.3 Tolerances on the length dimensions
• 8.4 Formulae for calculating the dimensions of thread gauges
• 8.5 Formulae for calculating the dimensions of plain taper gauges
• 8.6 Other requirements
• 9 Inspection
• 9.1 Measuring conditions
• 9.2 Inspection items and measuring instruments
• 9.3 Arbitration
• 9.4 Wear inspection
• 9.5 Inspection of taper threaded parts and judgement of conformity
• 10 Marking and packaging
• Annex A (informative) Inspection of taper threaded parts and judgement of conformity
• Figure 1 Complete internal and external thread form with a taper of 1 to 16
• Figure 2 Truncated internal and external thread form with a taper of 1 to 16
• Figure 3 Permissible offset S of the root clearance groove relative to the thread form
• Figure 4 Type of construction of the working plug gauge for full form taper threads
• Figure 5 Type of construction of the working ring gauge for full form taper threads
• Figure 6 Type of construction of the setting plug gauge for truncated form taper threads
• Figure 7 Type of construction of the plain taper ring gauge
• Figure 8 Type of construction of the plain taper plug gauge
• Figure 9 Checking the functional pitch diameter of a working ring gauge for full form taper threads with a setting plug gauge for truncated form taper threads
• Table 1 Symbols and their explanation
• Table 2 Name, code, function, characteristics and rules of use of the gauges
• Table 3 Example of the marking of a gauge for a 1 1/2 taper pipe thread
• Table 4 Values of the thread crest arc elements of the complete internal and external thread form
• Table 5 Values of the relevant elements of the truncated internal and external thread form
• Table 6 Permissible offset S of the root clearance groove relative to the thread form
• Table 7 Dimensions of the working plug gauge for full form taper threads
• Table 8 Dimensions of the working ring gauge for full form taper threads and of the setting plug gauge for truncated form taper threads
• Table 9 Dimensions of the plain taper ring gauge
• Table 10 Dimensions of the plain taper plug gauge
• Table 11 Diameter tolerance on the gauge plane
• Table 12 Pitch tolerance, limit deviations of the taper and limit deviations of the half angle of the thread flank
• Table 13 Tolerances on the length dimensions
• Table 14 Formulae for calculating the dimensions on the gauge plane of thread gauges
• Table 15 Formulae for calculating the diameter on the gauge plane of plain taper gauges
• Table 16 Inspection items and measuring instruments
• Table 17 Wear limit w of the working plug gauge for full form taper threads
• Table 18 Wear limit A of the working ring gauge for full form taper threads