M5‑0.80 x 40mm Button Socket Cap Screw – Class 10.9, Black Oxide, ISO 7380

Designed for metric fastening applications requiring extended reach and high tensile strength, 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 provides deep thread engagement for secure fastening through thicker or multi‑component assemblies, enhancing joint stability and load retention. Its low‑profile button head maintains a clean, streamlined appearance in exposed or clearance‑limited installations, while the internal hex drive allows for precise torque application. Finished with a thermal black oxide coating, it delivers reduced glare, mild corrosion resistance, and a consistent technical finish suitable for industrial, machinery, and precision mechanical applications.