S-97832A318 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Corrosion Resistance: Crafted from 18-8 Stainless Steel for superior performance in harsh environments, reducing maintenance and replacement costs.
• High Tensile & Shear Strength: With a tensile strength of 70,000 psi and a minimum shear strength of 35,000 psi, it ensures reliable, long-lasting connections in demanding applications.
• Precision Thread Fit: Features a Class 3A thread fit for tighter tolerances and more secure fastening, minimizing the risk of loosening under vibration.
• Secure and Easy Drive: The knurled socket head with a 5/32" hex drive provides excellent grip and prevents tool slippage during installation and removal.
• Accurate Component Alignment: The precisely machined 3 3/4" shoulder with controlled diameter tolerance ensures perfect alignment for pivots, axles, and rotating assemblies.
• Broad Industry Compliance: Meets ASME B18.3 specifications and is RoHS 3 & REACH compliant, ensuring material safety and suitability for global markets.
• Durable Material Hardness: A Rockwell B55 hardness rating provides excellent wear resistance, extending the screw's service life in high-use scenarios.

Professional Applications & Engineering Value

This socket head shoulder screw is engineered to solve critical alignment and durability challenges in industrial machinery. The 1/4"-20 UNC coarse thread and Class 3A fit provide a robust, vibration-resistant fastening solution for components like gears, linkages, and bearings. The long, precision-ground 3 3/4" shoulder acts as a reliable datum surface, ensuring accurate positioning and reducing wear on mating parts. Manufactured from 18-8 Stainless Steel, it offers excellent corrosion resistance, making it ideal for applications in food processing, packaging, and automation equipment where cleanliness and longevity are paramount. The knurled head enhances grip for secure tool engagement, even in oily or gloved-hand conditions.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC thread with a Class 3A precision fit. The shoulder diameter is 5/16" with a tolerance of -0.004" to -0.002", and the shoulder length is 3 3/4" with a tolerance of -0.005" to 0.005". It is manufactured in compliance with the ASME B18.3 standard and conforms to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.