GB/T 819.2-1997

Cross recessed countersunk head screws — Part 2: Steel 8.8, stainless steel A2-70 and non-ferrous metals CU2 or CU3

十字槽沉头螺钉　第2部分：钢8.8、不锈钢A2-70和有色金属CU2或CU3

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