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DIN 912-Carton Steel Grade 12.9 Black Hex Socket Cap Screw. 1. Strength & Material High-tensile Grade 12.9 alloy steel delivers 1,220 MPa tensile strength for heavy-duty bolting applications. 2. Surface & Protection Black oxide finish offers corrosion resistance, reduced friction, and a professional industrial appearance for long-term use. 3. Standard & Precision DIN 912 compliant ensures precise socket head fit, optimal torque transfer, and reliable clamping force. 4. Application & Versatility Ideal for automotive, machinery, and construction fastening where high strength and compact design matter.