GB/T 28703-2012Test methods for parallel screw threads (English PDF)

National Standard of the People's Republic of China

ICS

21.040.01

Classification

J 04

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Contents

• Introduction
• 1 Scope
• 2 Normative references
• 3 Terms and definitions, code
• 4 test conditions
• 4.1 Standard reference conditions
• 4.2 Temperature Measurement Condition
• 4.3 testing apparatus condition
• 5 Detection
• 6.1 external thread single parameter measurement
• 6.1.1 Diameter
• 6.1.1.1 Overview
• 6.1.1.2 the amount of ball method
• 6.1.1.3 Three - point Method
• 6.1.1.4 axis cutting method
• 6.1.1.5 outside micrometer Act
• 6.1.1.6 thread micrometer Act
• 6.1.2 flank angle
• 6.1.2.1 Overview
• 6.1.2.2 Image to
• 6.1.2.3 Diffraction Interferometry
• 6.1.3 pitch (lead)
• 6.1.3.1 Overview
• 6.1.3.2 length measuring instrument method
• 6.1.3.3 Image to
• 6.1.4 large diameter
• 6.1.5 Trail
• 6.1.6 roundness and taper diameter cylinder
• 6.1.7 large diameter relative to the diameter of beating
• 6.1.8 tooth bottom radius of curvature
• 6.2 internal thread single parameter measurement
• 6.2.1 diameter
• 6.2.1.1 Overview
• 6.2.1.2 the amount of 24-ball method
• 6.2.2 flank angle
• 6.2.3 pitch (lead)
• 6.2.4 diameter cylindrical roundness and taper
• 6.2.5 Trail
• 6.2.6 trails in diameter relative beating
• 6.3 measurement result report
• 7 27 Thread Inspection
• 8 qualified determination
• Appendix A (informative) threaded multi-parameter measurement
• Annex B (informative) indicates thread gauge
• Annex D (informative) load three-pin diameter measuring method selection
• Appendix E (normative) Measurement Uncertainty Evaluation of Example
• References