4-40 x 1 1/4 316 Stainless Socket Head Cap Screw gives engineers a corrosion-resistant internal-hex screw for assemblies that need controlled installation in tight head-clearance areas. This material selection supports long-term service in many corrosive industrial and coastal settings. Hex-key installation helps technicians reach fastening points inside guards, covers, brackets, and fixtures. Typical placements include coastal enclosures, machine covers, and inspection plates where stainless corrosion resistance and internal-hex access are practical. Design engineers can compare the listed head dimensions and hex key size against counterbore and tooling requirements. Technical Highlights: Material: 316 Stainless Steel; Thread: 4-40 UNC; Length: 1 1/4 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.