S-90337A328 1/4"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction and passivated finish, ensuring long-term reliability in harsh environments
• Precise component alignment through exact 5/16" shoulder diameter with tight -0.001" to 0" tolerance for reduced vibration and wear
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty applications
• Space-saving low profile design with socket head allowing flush mounting in confined spaces while maintaining 0.156" hex drive accessibility
• Reliable thread engagement with Class 2A UNC coarse threads providing secure fastening and resistance to loosening
• Extended service life through precise 5/8" shoulder length with 0" to 0.002" tolerance for consistent bearing surface performance
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for global industrial applications

Professional Applications & Engineering Value

This precision shoulder screw delivers exceptional engineering value in demanding industrial environments where component alignment and corrosion resistance are critical. The 18-8 Stainless Steel construction with passivated finish provides superior protection against rust and chemical exposure, making it ideal for machinery, automation systems, and precision instruments. The low profile socket head design allows for compact assembly while maintaining accessibility with standard 0.156" hex drive tools. The precisely machined 5/8" shoulder length with tight tolerances ensures accurate pivot points and bearing surfaces, eliminating misalignment issues in rotating assemblies and mechanical linkages. The 1/4"-20 UNC coarse threads with Class 2A fit provide reliable fastening in high-vibration applications common in manufacturing equipment and industrial machinery.

Specification Summary & Compliance

This shoulder screw maintains Class 2A thread fit per UNC standards with precise dimensional control including shoulder diameter tolerance of -0.001" to 0" and shoulder length tolerance of 0" to 0.002". Manufactured from 18-8 Stainless Steel with passivated finish and mechanical properties including 70,000 psi tensile strength and Rockwell B55 hardness. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental and safety standards in industrial applications.