S-97832A279 5/16"-18 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 extended service life.
• Enhanced assembly precision due to the Class 3A thread fit and tight shoulder tolerances, ensuring reliable, vibration-resistant connections.
• High mechanical strength offering 70,000 psi tensile strength and 35,000 psi shear strength for demanding, heavy-duty applications.
• Secure, non-slip installation provided by the knurled head and hex socket drive, allowing for high-torque application without tool slippage.
• Broad compatibility and interchangeability with UNC coarse threads and compliance with the ASME B18.3 standard.
• Environmental and regulatory safety ensured by RoHS 3 and REACH compliance, making it suitable for global supply chains.
• Optimized for precise location and pivoting with a consistent 3/8" shoulder diameter and length, maintaining alignment in assemblies.

Professional Applications & Engineering Value

This 18-8 Stainless Steel shoulder screw is engineered to address critical challenges in precision machinery and industrial equipment. Its 3/8" shoulder diameter with controlled tolerances acts as a precise pivot or bearing surface, reducing wear and maintaining alignment in moving parts. The Class 3A thread fit and coarse UNC thread provide robust, vibration-resistant fastening, essential for high-stress environments. The knurled socket head and hex drive enable secure, high-torque installation, preventing cam-out and ensuring consistent clamping force. Ideal for use in assemblies requiring exact positioning, such as in robotics, conveyor systems, and automated machinery, this screw delivers reliable performance where dimensional accuracy and corrosion resistance are paramount.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, ensuring dimensional consistency and reliability. Threads are 5/16"-18 UNC with a Class 3A fit for precise engagement. The shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005", guaranteeing high precision. The screw is manufactured from 18-8 Stainless Steel with a hardness of Rockwell B55 and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming its suitability for regulated and environmentally conscious industries.