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Standard——GB, TB/T 2347-93, AREA or ASTM, GB and UIC
Size ——Diameter--M20,M22,M24&3/8″-1/8″
The length does not limit
Grade —— 8.8, 10.9 and also Grade 2 Grade 5 Grade 8
Surface treatment——black, electrogalvanization and Dacromet.
Square Heads & Hexagon Bolts
