S-90298A751 3/8"-16 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel and passivated finish, ideal for harsh industrial environments
• Exceptional dimensional stability with tight shoulder diameter (±0.001") and length (±0.005") tolerances for precise component alignment
• Reliable high-strength performance featuring Rockwell B55 hardness and Class 3A thread fit for vibration resistance
• Secure installation and removal with hex socket drive and knurled head for enhanced grip during torque application
• Broad industry compatibility through UNC coarse threading and right-hand direction matching standard assembly practices
• Regulatory compliance assurance meeting ASME B18.3 specifications and environmental standards (RoHS 3, REACH)
• Extended service life through corrosion-resistant materials and precision manufacturing for reduced maintenance frequency

Professional Applications & Engineering Value

This precision shoulder screw delivers critical engineering value in applications requiring exact component positioning and rotational stability. The 18-8 stainless steel construction with passivated finish provides exceptional corrosion resistance for machinery operating in humid or chemically aggressive environments. The 1/2" shoulder diameter with minimal tolerance variation ensures precise bearing surfaces and pivot points in assemblies, while the 3 1/4" shoulder length maintains accurate spacing between components. The Class 3A thread fit and UNC coarse threading prevent loosening under vibration, making these socket head shoulder screws ideal for precision equipment, automation systems, and heavy-duty industrial machinery where dimensional accuracy and reliability are paramount.

Specification Summary & Compliance

This shoulder screw maintains Class 3A thread fit with UNC 3/8"-16 threading and features precise shoulder dimensions (diameter: 1/2" ±0.001", length: 3 1/4" ±0.005"). Manufactured to ASME B18.3 specifications with Rockwell B55 hardness, the component is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring both dimensional precision and regulatory adherence for industrial applications.