S-97832A323 1/4"-28 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 reduced wear due to the knurled head and Class 3A thread fit for minimal backlash.
• High mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for demanding applications.
• Easy installation and removal with a standard hex socket drive (5/32") and right-hand UNF fine thread.
• Consistent dimensional accuracy ensured by ASME B18.3 compliance and tight shoulder tolerances.
• Enhanced durability from Rockwell B55 hardness, providing long-term reliability under load.
• Environmentally safe and compliant with RoHS 3 and REACH regulations for global use.

Professional Applications & Engineering Value

This 18-8 Stainless Steel shoulder screw is engineered to address critical alignment and load-bearing challenges in machinery, automation, and precision assemblies. The 1/4"-28 UNF fine thread and Class 3A fit ensure secure fastening with minimal vibration loosening, while the 1/2" shoulder length provides a stable pivot or bearing surface for rotating parts. The knurled head enhances grip during manual adjustments, and the hex socket drive allows for high-torque installation in confined spaces. Ideal for use in industrial equipment, jigs, and fixtures, this screw’s corrosion-resistant properties and high shear strength make it a reliable choice for maintaining precision in demanding environments.

Specification Summary & Compliance

This shoulder screw features a 1/4"-28 UNF fine thread with Class 3A thread fit for high precision. The shoulder diameter is 5/16" with a tolerance of -0.004" to -0.002", and the shoulder length is 1/2" with a tolerance of -0.005" to 0.005". It complies with ASME B18.3 manufacturing standards and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring environmental safety and consistent performance.