We supply wholesale carbon steel hand-tightened flat head bolts with hole, flat head drilled screws, lifting eye bolts and non-standard movable connector bolts with hole. Made of high-quality carbon steel, processed by CNC turning and cold heading integrated forming, with high hardness, strong tensile strength and stable structure. Flat head design is easy for manual tightening without tools; reserved hole design realizes rope hanging, pin connection, positioning and movable assembly, flexible for installation and disassembly. We can customize non-standard size, hole position, hole diameter, thread specification and overall length according to drawings and samples. Surface treatments like galvanizing, black oxide and zinc plating are available for anti-rust and corrosion resistance. Widely used in hardware engineering, equipment connection, rigging lifting, furniture assembly, mechanical movable positioning and fixed connection scenarios. Factory direct supply, complete specifications in stock, support small batch customization and large quantity wholesale.