4-40 x 3/4 Brass Socket Head Cap Screw supports equipment designs that need a brass machine screw with cylindrical head geometry and internal-hex engagement. The non-ferrous construction can be useful near electrical components, test fixtures, controls, and instruments. The internal hex drive supports positive tool engagement where surrounding components limit outside wrench clearance. Typical placements include precision instruments, test equipment, and panel-mounted hardware where brass material properties and socket access are useful. Design engineers can compare the listed head dimensions and hex key size against counterbore and tool-access requirements. Technical Highlights: Material: Brass; Thread: 4-40 UNC; Length: 3/4 in.; Nominal Body Diameter: 0.112 in.; Head Diameter: 0.183 in. max / 0.176 in. min; Head Height: 0.112 in. max / 0.108 in. min; Hex Key Size: 3/32; Drive Type: internal hex. Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.