Features specifications: DIN6921 hex flange bolt, DIN6921 flange hex
bolt
Grade 4.8/grade 6.8/grade 8.8/grade 10.9
Size: M4 to M60
For Quality Assurance we equipped some equipment for quality check, we owned: elemental analyzer, hardness tester, Melted iron composition analyzer, peel force tester, pointing machine, polishing machine, salt-mist corrosion tester, sample polishing machine and sample tester.