M4‑0.70 x 40mm Button Socket Cap Screw – A4 Stainless Steel (316)

This M4‑0.70 x 40mm button socket cap screw is manufactured from A4 (316) stainless steel for exceptional corrosion resistance in marine, chemical, and outdoor environments. The extended 40mm length provides deep thread engagement for secure fastening through thicker or multi‑layer assemblies, while the low‑profile button head delivers a smooth, professional appearance in visible or clearance‑restricted applications. Featuring an internal hex drive, it is ideal for precision metric fastening where strength, durability, and long‑term corrosion resistance are required.