S-97832A121 3/8"-16 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments and extended service life.
• Exceptional mechanical strength with 70,000 PSI tensile and 35,000 PSI shear strength, ensuring reliable performance under high-stress loads.
• Precise alignment and smooth rotation provided by the 1/2" diameter shoulder with controlled tolerances, reducing wear on mating parts.
• Secure, high-torque installation enabled by the 1/4" hex socket drive and knurled head, preventing tool slippage and ensuring a tight fit.
• Reliable, coarse-thread engagement with a Class 3A UNC thread fit, offering superior vibration resistance and faster assembly in demanding applications.
• Broad industry compliance meeting ASME B18.3 standards, RoHS 3, and REACH, guaranteeing quality and safety for global supply chains.
• Optimized for durability with a Rockwell B55 hardness, providing excellent resistance to deformation and surface wear over time.

Professional Applications & Engineering Value

This 3/8"-16 UNC shoulder screw is engineered to address critical alignment and pivot point challenges in machinery, automation, and assembly fixtures. The 18-8 stainless steel material offers excellent resistance to rust and chemical exposure, making it suitable for food processing, marine, and outdoor equipment. The precision 1/2" shoulder diameter with tight tolerances acts as a dependable bearing surface, minimizing misalignment and reducing bushing wear in rotating assemblies like conveyor systems, robotic arms, and printing machinery. The hex socket head with a knurled texture ensures secure tool engagement in confined spaces, while the Class 3A thread fit provides robust, vibration-resistant fastening for high-cycle operations. Its compliance with ASME B18.3 ensures dimensional consistency, streamlining maintenance and parts replacement in industrial settings.

Specification Summary & Compliance

This shoulder screw features a 3/8"-16 UNC thread with a Class 3A fit for precise, high-strength engagement. The shoulder diameter is 1/2" with a tolerance of -0.004" to -0.002", and the shoulder length is 7/8" with a tolerance of -0.005" to 0.005", ensuring consistent performance as a pivot or spacer. Manufactured to ASME B18.3 specifications, it is also fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for use in regulated industries and international markets.