M6‑1.00 x 40mm Button Socket Cap Screw – Class 10.9, Black Oxide, ISO 7380

Designed for metric fastening applications that require extended length and high mechanical strength, this M6‑1.00 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, improving joint stability and load retention. Its low‑profile button head maintains a smooth, finished appearance while reducing snag points in exposed installations. Featuring an internal hex drive for controlled torque application, it is finished with a thermal black oxide coating that reduces glare, offers mild corrosion resistance, and provides a durable technical finish suitable for industrial and precision mechanical use.