M4‑0.70 x 20mm Button Socket Cap Screw – Class 10.9, Black Oxide, ISO 7380

Intended for metric fastening applications that require greater reach and consistent clamping strength, this M4‑0.70 x 20mm button socket cap screw is manufactured from Class 10.9 alloy steel and produced to ISO 7380 standards. The longer 20mm length supports secure fastening through thicker materials or stacked components, while the low‑profile button head minimizes protrusion and maintains a clean, finished appearance in exposed or clearance‑limited assemblies. An internal hex drive allows for controlled torque application, and the thermal black oxide finish provides reduced glare, mild corrosion resistance, and a uniform technical surface suitable for machinery, tooling, and precision mechanical use.