S-97832A305 5/16"-24 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
• Precise alignment and smooth rotation ensured by the 2" shoulder with tight diameter tolerance
• Enhanced torque application and reduced tool slippage from the knurled socket head and 3/16" hex drive
• Reliable fastening in high-vibration applications due to the Class 3A thread fit and UNF fine thread
• High mechanical strength and durability with 70,000 psi tensile strength and Rockwell B55 hardness
• Secure component location provided by the standard shoulder fit and consistent shoulder length
• Compliance with global safety standards including RoHS 3 and REACH for environmentally conscious manufacturing

Professional Applications & Engineering Value

This socket head shoulder screw is engineered to address critical alignment and durability challenges in precision machinery. The 18-8 stainless steel material offers excellent corrosion resistance, making it suitable for applications exposed to moisture or chemicals, such as in food processing, marine, or outdoor equipment. The 2" shoulder length provides a stable bearing surface for rotating components like gears, pulleys, and linkages, reducing wear and ensuring smooth operation. The knurled head enhances grip during installation, especially in confined spaces, while the Class 3A thread fit and UNF fine thread deliver secure, vibration-resistant connections. Ideal for industrial automation, automotive assemblies, and electronic enclosures, this screw maintains dimensional accuracy under load, thanks to its high tensile and shear strength, supporting long-term reliability in demanding environments.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, ensuring consistent quality and interchangeability. The thread fit is Class 3A with a 5/16"-24 UNF fine thread, providing tight tolerances for precision assemblies. Shoulder dimensions include a diameter of 3/8" (tolerance: -0.004" to -0.002") and length of 2" (tolerance: -0.005" to 0.005"), guaranteeing accurate fits. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances for safe use in various industries.