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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
Company News
Industry Information
Enquiries
Application
Recruitment
Contact
CN
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GB_T 3098.22-2009 Mechanical properties of fasteners Bolts, screws and studs of fine-grained non-tempered steel
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