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About
Company profile
Office environment
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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
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Industry Information
Enquiries
Application
Recruitment
Contact
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GB_T 1231-2006 Technical conditions for high-strength large hexagonal head bolts, large hexagonal nuts and washers for steel structures
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