S-97345A749 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.
• Precise alignment and bearing surface provided by the 1/2" diameter shoulder with tight tolerances, reducing wear and ensuring accurate component positioning.
li>High-strength performance delivering 70,000 psi tensile and 35,000 psi shear strength for demanding applications requiring reliable load-bearing capabilities.
• Secure and efficient installation with a 1/4" hex socket drive and knurled head, offering excellent grip and preventing tool slippage during tightening.
• Reliable thread engagement through Class 3A UNC coarse threads, ensuring consistent fastening and vibration resistance in right-hand threaded assemblies.
• Extended service life supported by Rockwell B79 hardness, providing excellent durability and resistance to deformation under stress.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality, safety, and environmental responsibility.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in industrial fastening and precision machinery. The 4-1/2" shoulder length acts as a precise pivot or axle, minimizing misalignment and reducing wear on moving parts in assemblies like conveyor systems, robotic arms, and pivoting mechanisms. The coarse UNC thread and Class 3A fit ensure quick assembly and high vibration resistance, essential for heavy-duty applications. With a knurled head and hex drive, it allows for secure tool engagement in tight spaces, enhancing installation efficiency. The corrosion-resistant material makes it suitable for marine, chemical processing, and food industry equipment, where durability and compliance with RoHS and REACH are paramount for long-term reliability.

Specification Summary & Compliance

This shoulder screw features a 3/8"-16 UNC thread with Class 3A fit for precise tolerance, a shoulder diameter of 1/2" (tolerance: -0.004" to -0.002"), and a shoulder length of 4-1/2" (tolerance: -0.005" to 0.005"). Manufactured in accordance with ASME B18.3 specifications, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards for industrial use.