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Black Oxide Factory ASME B18.2.1 Square Head Bolt. Wide Material Selection: Available in Carbon Steel, Stainless Steel 304/316, and other grades. Multiple Finish Options: Plain, Zinc plated, Black oxide, Chromate, Nickel-plated, and Hot Galvanizing. Standard Compliance: Manufactured strictly according to ASME B18.2.1 and ANSI standards. Competitive Pricing: Offers superior service and competitive prices compared to competitors. Flexible Packaging: Packed in cartons on pallets or customized according to customer requirements.