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Special Bolt/ Non-standard Bolts

规格参数

size	Metric/ Imperial Size
hardness	4.8、8.8、10.9、12.9， A2-70, A4-80 (304/316)
material	Carbon Steel, Stainless Steel, Brass, Cooper
standard	NA
surfaceTreatment	Natural, Plain, Oxide Black, Zinc Plated, HDG, Dacromet