S-94383A470 3/8"-16 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 140,000 psi tensile strength and 84,000 psi shear strength for reliable performance in high-stress applications.
• Superior wear and corrosion resistance provided by the black oxide finish, extending service life in demanding industrial environments.
• Precise alignment and secure positioning ensured by the Class 3A thread fit and standard shoulder fit, reducing assembly errors and improving machine reliability.
• Easy and secure installation with a knurled socket head and 1/4" hex drive, preventing tool slippage and enabling efficient maintenance.
• Enhanced durability and fatigue resistance from Alloy Steel construction and Rockwell C32 hardness, suitable for repetitive motion and heavy-duty use.
• Broad industry compliance meeting ASME B18.3 and ASTM A574 standards, ensuring consistent quality and interchangeability.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, supporting sustainable procurement and regulatory requirements.

Professional Applications & Engineering Value

This 3/8"-16 UNC shoulder screw is engineered to address critical challenges in precision machinery and assembly systems. The alloy steel construction, combined with a black oxide finish, provides excellent resistance to corrosion and wear, making it ideal for applications in automotive, aerospace, and industrial equipment where exposure to harsh conditions is common. The 1-1/4" shoulder length and precise Class 3A thread fit ensure accurate alignment of components such as gears, pulleys, and linkages, minimizing vibration and reducing the risk of premature failure. The knurled socket head with a 1/4" hex drive allows for secure, torque-controlled installation, enhancing operator safety and efficiency. By integrating high tensile and shear strength, this shoulder screw supports heavy loads and dynamic stresses, delivering long-term reliability and reducing maintenance downtime in professional engineering environments.

Specification Summary & Compliance

This shoulder screw features a 3/8"-16 UNC coarse thread with Class 3A thread fit for precise engagement, and shoulder dimensions including a diameter of 1/2" (tolerance: -0.004" to -0.002") and length of 1-1/4" (tolerance: -0.005" to 0.005"). It is manufactured in accordance with ASME B18.3 and ASTM A574 specifications, ensuring dimensional accuracy and mechanical performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmental and safety standards in global supply chains.