Cap Screws Flat Socket Alloy Thermal Black Oxide 5/16-18 x 2 1/4 are high-strength socket cap screws designed for demanding assemblies where precision, security, and durability matter. The alloy steel construction paired with a thermal black oxide finish delivers strong clamping power with a low-glare, corrosion-conscious profile suitable for machinery, automotive, and fabrication applications.

These screws feature a 5/16-18 thread and an overall length of 2-1/4 inches, making them compatible with standard fastener hardware and nuts. The flat socket design ensures a clean, flush drive in tight or recessed spaces, helping you achieve reliable torque and consistent performance in every job.

• Thread size: 5/16-18
• Length: 2-1/4 in (overall)
• Finish: Thermal Black Oxide
• Material: Alloy steel
• Drive type: Hex socket
• Head style: Cap screw

Applications: Ideal for precision machinery, automotive assemblies, equipment fabrication, and maintenance tasks where a strong, durable fastener with a low-glare finish is required. Our cap screws are designed to withstand regular use in industrial environments while maintaining dependable torque and secure clamping.