S-97345A718 3/8"-16 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 chemical exposure.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable, high-stress fastening applications.
• Precision shoulder alignment with a 1/2" diameter and tight length tolerance (±0.005") ensures accurate component positioning and reduces assembly errors.
• Secure, high-torque installation enabled by the 1/4" hex socket drive and knurled head, preventing tool slippage and ensuring consistent clamping force.
• Reliable thread engagement with Class 3A UNC coarse threads, providing excellent vibration resistance and faster assembly in demanding conditions.
• Compliance with global standards including ASME B18.3, RoHS 3, and REACH, ensuring quality, safety, and environmental responsibility.
• Durable, long-lasting performance with a Rockwell B79 hardness, maintaining integrity under repeated use and mechanical stress.

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 1/2" shoulder diameter with minimal tolerances provides a stable pivot or bearing surface, eliminating misalignment and reducing wear on moving parts. Its high tensile strength and Class 3A UNC coarse threads ensure secure fastening in high-vibration environments, such as conveyor systems or robotic arms, where loosening can lead to operational failures. The knurled head and hex socket drive facilitate easy installation and removal, even in confined spaces, enhancing maintenance efficiency. Ideal for applications requiring corrosion resistance and dimensional accuracy, this screw delivers consistent performance in industries like aerospace, marine, and chemical processing.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, with precise dimensions including a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Threads conform to UNC coarse spacing with a Class 3A fit for superior accuracy. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards for industrial use.