S-97832A310 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments and reducing replacement frequency.
• High-strength fastening performance offering 70,000 psi tensile strength and 35,000 psi minimum shear strength for reliable load-bearing applications.
• Precise Class 3A thread fit ensures tight tolerances and secure assembly, minimizing loosening under vibration or dynamic loads.
• Enhanced installation grip with knurled head texture and 5/32" hex drive, allowing for secure tool engagement and reduced slippage.
• Accurate shoulder positioning featuring a 5/16" diameter shoulder with tight tolerances for precise component alignment and spacing.
• Broad compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring material safety and regulatory acceptance.
• Durable Rockwell B55 hardness providing excellent wear resistance and longevity in repetitive or high-stress applications.

Professional Applications & Engineering Value

This 1/4"-20 UNC shoulder screw is engineered to address critical alignment and fastening challenges in precision machinery, automotive assemblies, and industrial equipment. The 18-8 Stainless Steel material offers inherent corrosion resistance, making it suitable for environments exposed to moisture, chemicals, or outdoor conditions. The Class 3A thread fit and coarse UNC thread type provide robust engagement, reducing the risk of cross-threading and ensuring consistent clamping force. The knurled head texture enhances grip during manual or automated installation, while the standard socket head profile with a 5/32" hex drive allows for efficient torque application. Its 7/16" shoulder length and precise diameter tolerances enable accurate component positioning, minimizing misalignment and wear in rotating or sliding mechanisms. This design is ideal for applications requiring reliable shoulder screw performance under dynamic loads, such as in pivots, guides, and bearing supports.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for high-precision assembly. The shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005", ensuring dimensional accuracy. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances. Manufactured from 18-8 Stainless Steel with a hardness of Rockwell B55, it meets rigorous mechanical standards for industrial use.