HT Allen Socket CSK Screw:5/8" x 4"UNC - DIN 7991/12.9/Black/Half Thread

This heavy-duty fastener is a steel Allen socket countersunk screw constructed to DIN 7991 standards. The component features a 12.9 property class, indicating high-tensile strength suitable for demanding structural and mechanical applications. With a nominal diameter of 5/8" and a nominal length of 4", it provides substantial holding power for thick material joints. The surface finish is black, which offers a specific aesthetic or protective characteristic depending on the installation environment. Buyers select this product for its combination of high strength and secure hexagon drive capability. Thread coverage is designated as half thread, which influences engagement depth and installation speed. Selection relies on matching the UNC thread series, specific dimensions, and required load-bearing capacity to the assembly needs.