S-97345A794 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh environments and extended service life.
• Exceptional mechanical strength offering 70,000 psi tensile strength and 35,000 psi minimum shear strength for high-stress applications.
• Precise alignment and location enabled by the 5/8" shoulder diameter with tight tolerances, ensuring component stability.
• High-reliability thread engagement with Class 3A fit and coarse UNC threads for secure, vibration-resistant fastening.
• Secure and efficient installation using the 5/16" hex socket drive and knurled head for improved grip and torque application.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, ensuring quality and regulatory acceptance.
• Optimized for durability with a Rockwell B79 hardness rating, resisting wear and deformation under load.

Professional Applications & Engineering Value

This 1/2"-13 UNC shoulder screw is engineered to address critical alignment and pivot point challenges in industrial applications. The 316 Stainless Steel material provides excellent resistance to chemicals and moisture, making it suitable for machinery, marine equipment, and food processing systems. The precision-machined shoulder acts as a built-in spacer or bearing surface, eliminating the need for separate components and reducing assembly time. The hex socket head with a knurled texture allows for high-torque installation in confined spaces, while the coarse thread ensures quick assembly and resistance to loosening in vibrating environments. This design delivers reliable performance, reduced maintenance, and long-term cost savings in demanding engineering setups.

Specification Summary & Compliance

This shoulder screw features a 1/2"-13 UNC thread with a Class 3A fit for precise thread engagement. The shoulder diameter is 5/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 5/16" with a tolerance of -0.005" to 0.005", ensuring dimensional accuracy. It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, confirming its suitability for regulated and high-performance industrial use.