M5‑0.80 x 40mm Button Socket Cap Screw – Class 10.9, Zinc‑Baked (Cr+3), ISO 7380

Engineered for high‑strength metric fastening applications that require extended length and enhanced corrosion protection, this M5‑0.80 x 40mm button socket cap screw is manufactured from heat‑treated Class 10.9 alloy steel and produced to ISO 7380 standards. The 40mm length allows for deep thread engagement through thicker or multi‑component assemblies, ensuring secure, load‑bearing performance. Its smooth, low‑profile button head provides a clean, finished appearance in exposed or clearance‑restricted applications, while the internal hex drive enables precise torque application. Finished with a zinc‑baked coating and trivalent chromium (Cr+3) passivation, it delivers improved corrosion resistance and reduced risk of hydrogen embrittlement—ideal for industrial, automotive, and mechanical use.