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Home
About
Company profile
Office environment
Honours
Services
Chemical composition testing
Microstructure testing
Fastener performance testing
Magnetic Particle Inspection Testing
Hardness test
Dynamic performance testing
Dimensional measurement tests
Heat treatment testing
News
Company News
Industry Information
Enquiries
Application
Recruitment
Contact
CN
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GB_T 5779.3-2000 Surface defects of fasteners Bolts, screws and studs Special requirements
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GB_T 6188-2017 Hexagon socket pattern for bolts and screws
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