S-97345A223 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and extended service life.
• Exceptional mechanical reliability provided by 70,000 psi tensile strength and 35,000 psi shear strength, reducing the risk of fastener failure.
• Precise alignment and pivot function enabled by the accurately machined 3/8" shoulder with tight diameter tolerance, ensuring smooth rotational movement.
• Easy installation and high torque capability with the hex socket (3/16" drive) and knurled head, allowing for secure tool grip and efficient assembly.
• Consistent, vibration-resistant thread engagement due to the 5/16"-18 UNC coarse thread with Class 3A fit, maintaining joint integrity under dynamic loads.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, ensuring quality and environmental safety for global supply chains.
• Optimized for high-stress applications featuring Rockwell B79 hardness, providing excellent wear resistance and durability in mechanical assemblies.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy-duty equipment. The UNC coarse thread and Class 3A fit deliver reliable, repeatable fastening in high-vibration environments, minimizing loosening and misalignment. The knurled head and hex drive design facilitate quick, secure installation even in confined spaces, boosting assembly efficiency. Its high tensile and shear strength ensures dependable performance as a pivot, axle, or locating pin in linkages, gears, and rotating assemblies, reducing maintenance needs and enhancing operational uptime for industrial users.

Specification Summary & Compliance

This shoulder screw features a 5/16"-18 UNC coarse thread with Class 3A thread fit for precise tolerance. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and shoulder length is 7/16" with tolerance -0.005" to 0.005". It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring both performance consistency and regulatory adherence for industrial applications.