S-90324A122 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh environments and reducing maintenance costs.
• Exceptional mechanical strength with 70,000 psi tensile strength and 35,000 psi minimum shear strength for reliable performance under high-stress conditions.
• Precise alignment and smooth rotation ensured by the 1" shoulder with tight tolerances, minimizing wear and extending component life.
• Secure, non-slip installation thanks to the knurled head and 5/32" hex drive, allowing for high torque application without stripping.
• Reliable left-hand thread engagement with Class 3A UNC coarse threads, preventing loosening in counter-rotational applications.
• Broad regulatory compliance with RoHS 3 and REACH, ensuring safety and environmental standards are met for global industrial use.
• Versatile drive compatibility using a standard hex socket, facilitating quick and easy assembly and disassembly.

Professional Applications & Engineering Value

This 18-8 Stainless Steel shoulder screw is engineered to address critical challenges in industrial machinery, automation, and precision equipment. Its left-hand UNC thread provides secure fastening in applications subject to counter-clockwise forces, preventing accidental disassembly. The 1" shoulder length with precise diameter and length tolerances acts as a reliable pivot or spacer, ensuring accurate alignment of moving parts like gears, linkages, and bearings, which reduces vibration and wear. The knurled head enhances grip during manual adjustments, while the hex drive allows for high-torque installation. Made from corrosion-resistant 18-8 Stainless Steel, it performs reliably in demanding environments, from food processing to outdoor machinery, offering long-term durability and reduced downtime.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 left-hand UNC coarse thread with a Class 3A thread fit for precise, secure fastening. The shoulder has a diameter of 5/16" with a tolerance of -0.004" to -0.002" and a length of 1" with a tolerance of -0.005" to 0.005", ensuring consistent performance. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of hazardous substances and suitable for industrial applications requiring strict environmental and safety standards.