S-97768A386 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and black oxide finish, ensuring long-term reliability in harsh industrial environments
• Precise component alignment thanks to the 2 1/2" shoulder length with tight diameter tolerance, reducing assembly errors and improving machine performance
• Exceptional load-bearing capability with 70,000 psi tensile strength and 35,000 psi shear strength, providing secure fastening under high-stress conditions
• Reliable thread engagement through Class 3A thread fit and UNC coarse threads, minimizing cross-threading and ensuring consistent clamping force
• Enhanced grip and torque application with knurled socket head and hex drive design, preventing tool slippage during installation
• Industry-standard compliance meeting ASME B18.3 specifications, guaranteeing interchangeability and quality assurance
• Environmental regulation adherence with RoHS 3 and REACH compliance, making it suitable for global industrial supply chains

Professional Applications & Engineering Value

This 18-8 stainless steel shoulder screw delivers critical engineering solutions for precision machinery and industrial equipment. The black oxide finish enhances corrosion resistance while maintaining dimensional stability in demanding environments. With its 2 1/2" shoulder length and precise diameter tolerance, it provides accurate bearing surfaces for rotating components in automation systems, jigs, and fixtures. The Class 3A thread fit and UNC coarse threads ensure reliable fastening in high-vibration applications, while the knurled socket head facilitates secure tool engagement during assembly. Ideal for stripper bolt applications in manufacturing dies and precision alignment in robotic systems, this shoulder screw combines exceptional strength with dimensional accuracy to reduce maintenance cycles and improve equipment uptime.

Specification Summary & Compliance

Manufactured to ASME B18.3 standards with Class 3A thread fit for precision engagement. Features 1/4"-20 UNC coarse threads with 3/4" thread length and 2 1/2" shoulder length maintaining tight tolerances (shoulder diameter: -0.004" to -0.002", shoulder length: -0.005" to 0.005"). Mechanical properties include Rockwell B55 hardness, 70,000 psi tensile strength, and 35,000 psi minimum shear strength. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial applications.