S-97768A264 8-32 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel and black oxide finish for extended service life in harsh environments
• High-strength performance delivering 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding applications
• Precision Class 3A thread fit ensuring secure, reliable fastening with minimal backlash in critical assemblies
• Enhanced grip and handling thanks to the knurled head texture and standard hex drive for easy installation
• Accurate shoulder positioning with tight diameter tolerance (-0.004" to -0.002") for consistent alignment in machinery
• Industry-standard compliance meeting ASME B18.3 specifications, RoHS 3, and REACH for global regulatory acceptance
• Durable Rockwell B55 hardness providing excellent wear resistance and long-term reliability under load

Professional Applications & Engineering Value

This 8-32 UNC thread shoulder screw is engineered to address critical alignment and load-bearing challenges in industrial equipment. The 18-8 stainless steel construction combined with a black oxide finish offers exceptional corrosion resistance, making it ideal for applications in humid or chemically aggressive environments. The Class 3A thread fit and precise shoulder diameter tolerance ensure minimal play and accurate component positioning, reducing wear in rotating assemblies such as pulleys, gears, and linkages. With a 1 1/2" shoulder length and coarse UNC thread, it provides robust support in machinery, automation systems, and heavy-duty fixtures where vibration resistance and repeatable alignment are paramount. The socket head with hex drive allows for easy installation in confined spaces, enhancing assembly efficiency.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit with UNC coarse threading and a thread length of 3/8". The shoulder diameter is maintained within a tight tolerance of -0.004" to -0.002", while the shoulder length tolerance is -0.005" to 0.005". Manufactured in compliance with ASME B18.3 standards, it also meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulatory requirements, ensuring environmental safety and material reliability for global industrial use.