M8‑1.25 x 40mm Button Socket Cap Screw – Class 10.9, Black Oxide, ISO 7380

Engineered for metric fastening applications that require extended length and high mechanical strength, this M8‑1.25 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 in thicker or multi‑component assemblies, supporting reliable load‑bearing performance. Its smooth, low‑profile button head minimizes snagging while maintaining a clean, finished appearance in exposed installations. Featuring an internal hex drive for precise torque application, it is finished with a thermal black oxide coating that reduces glare, offers mild corrosion resistance, and delivers a durable technical finish suitable for industrial and mechanical use.