Premium 8.8 grade flat head spline hexagon socket screws with galvanized surface treatment, available in standard size M12*60 and non-standard customized specifications. Made of high-strength alloy steel with integral forming process, featuring high hardness, strong tensile strength and excellent bearing capacity. Galvanized finish provides outstanding rustproof and anti-corrosion performance, adapting to various indoor and outdoor working environments. Precision machined spline inner hex structure enables convenient installation, tight locking and not easy to loosen. Flat head design fits flush with mounting surface for neat and compact assembly. Widely used in mechanical equipment, engineering machinery, fixture fixing and industrial assembly fields. Factory direct supply with complete specifications in stock, support non-standard size customization and bulk wholesale.