240pcs/Box 304 stainless steel hexagon screw cylinder head bolt 12.9

This 240-piece fastener set features a range of hex socket (Allen) head bolts with cylinder head design, made from 304 stainless steel. These bolts are ideal for professional and DIY use where high corrosion resistance, durability, and neat installation are required.

While 304 stainless steel is not technically rated as Grade 12.9 (which is typically associated with high-carbon alloy steel), it does offer excellent tensile strength, non-magnetic properties, and superior rust resistance, making it suitable for applications in moist environments, machinery, electronics, and furniture assembly.

Each screw in the kit features a hex socket drive, allowing precise tightening using an Allen wrench or hex key. The kit comes in a labeled storage box, with sizes sorted for easy identification and quick access.