S-90298A602 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 for extended service life in harsh environments
• Precise component alignment enabled by the 3 1/2" shoulder length with tight diameter and length tolerances for reliable assembly fit
• High-strength thread engagement through Class 3A UNC coarse threads providing excellent vibration resistance and load distribution
• Enhanced torque application with hex socket drive and knurled head for secure tool grip during installation and maintenance
• Optimized durability from Rockwell B55 hardness balancing strength with material toughness for repeated use
• Regulatory compliance assurance meeting ASME B18.3 specifications and environmental standards including RoHS 3 and REACH
• Versatile mounting capability with standard socket head profile accommodating various industrial tooling systems

Professional Applications & Engineering Value

This precision shoulder screw delivers critical engineering solutions where component alignment and rotational stability are paramount. The substantial 3 1/2" shoulder length acts as a precise axle or pivot point in machinery assemblies, eliminating the need for additional bushings or spacers. Manufactured from 18-8 stainless steel with a passivated finish, it resists corrosion in demanding environments while maintaining dimensional stability. The Class 3A UNC coarse threads ensure secure fastening in high-vibration applications, while the hex socket drive with knurled head provides positive tool engagement for precise torque control. Ideal for precision equipment, automation systems, and rotating assemblies where shoulder screws must maintain exact positioning under load.

Specification Summary & Compliance

This shoulder screw features precision dimensions including 1/4"-20 UNC Class 3A threads with coarse spacing, 3 1/2" shoulder length (-0.005" to 0.005" tolerance), and 5/16" shoulder diameter (-0.001" to 0.001" tolerance). Manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. The 18-8 stainless steel construction achieves Rockwell B55 hardness with passivated finish for enhanced corrosion protection.