S-97832A178 8-32 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 offering 70,000 psi tensile strength and 35,000 psi minimum shear strength for reliable performance under high stress.
• Precise alignment and smooth rotation ensured by the 1/4" shoulder diameter with controlled tolerances, reducing wear on mating components.
• Secure and efficient installation with the knurled socket head and 1/8" hex drive, providing excellent grip and preventing tool slippage.
• Reliable thread engagement with Class 3A fit and 8-32 UNC coarse thread, ensuring consistent fastening and vibration resistance.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality and environmental safety for global supply chains.
• Versatile right-hand thread design compatible with standard UNC components, simplifying assembly and maintenance processes.

Professional Applications & Engineering Value

This 18-8 stainless steel shoulder screw is engineered to address critical challenges in precision assembly and motion control systems. The 1/4" shoulder diameter with tight tolerances provides a stable bearing surface, minimizing misalignment and reducing friction in rotating assemblies like pivots, linkages, and gear mechanisms. The UNC coarse thread and Class 3A fit deliver robust fastening in applications subject to vibration, such as machinery, automotive fixtures, and electronic enclosures. Made from corrosion-resistant 18-8 stainless steel, it withstands exposure to moisture and chemicals, ensuring longevity in demanding environments. The knurled socket head with a hex drive allows for high-torque installation without cam-out, making it a reliable choice for automated or manual assembly lines where precision and durability are paramount.

Specification Summary & Compliance

This shoulder screw features a 1/4" shoulder diameter with a tolerance of -0.004" to -0.002" and a shoulder length of 5/16" with a tolerance of -0.005" to 0.005". The 8-32 UNC thread adheres to Class 3A fit standards for precise engagement. It meets ASME B18.3 specifications for dimensional consistency and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for international industrial applications.