S-90298A592 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Precise component alignment through Class 3A thread fit and ±0.005" shoulder length tolerance for reliable assembly
• High mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
• Secure installation and removal with hex socket drive and knurled head for improved grip during torque application
• Industry-standard compatibility through UNC coarse threading and ASME B18.3 compliance for seamless integration
• Environmental regulation compliance with RoHS 3 and REACH adherence for global manufacturing suitability
• Reduced assembly time with right-hand coarse threading enabling faster installation in production environments

Professional Applications & Engineering Value

This precision shoulder screw addresses critical alignment challenges in mechanical assemblies where component positioning accuracy is paramount. The 2-1/4" shoulder length with tight ±0.005" tolerance ensures consistent spacing between mounted parts, eliminating misalignment issues in rotating machinery, pivot points, and guide mechanisms. Manufactured from 18-8 stainless steel with a passivated finish, it provides exceptional resistance to corrosion in demanding environments including manufacturing equipment, automotive assemblies, and outdoor applications. The Class 3A thread fit guarantees secure fastening without binding, while the hex socket drive and knurled head facilitate installation in confined spaces. These engineering features combine to deliver reliable performance in precision instruments, robotic systems, and industrial machinery where dimensional stability and corrosion resistance are critical operational requirements.

Specification Summary & Compliance

This shoulder screw maintains precise dimensional control with Class 3A thread fit and shoulder length tolerance of ±0.005". The UNC coarse threading follows standardized specifications while the manufacturing process adheres to ASME B18.3 standards for consistent quality and performance. Regulatory compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) requirements, ensuring environmental responsibility and global market acceptance for industrial applications.