S-91327A297 8-32 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Secure Vibration Resistance: Integrated nylon patch thread locker maintains fastener integrity in dynamic environments from -50° to 250°F, reducing maintenance needs.
• Exceptional Corrosion Resistance: Made from 18-8 stainless steel with a passivated finish for long-lasting performance in harsh industrial conditions.
• High Tensile Strength & Durability: With a 70,000 psi tensile strength and Rockwell B55 hardness, it withstands heavy loads without stripping or shearing.
• Precision Alignment & Smooth Rotation: The 3/16" shoulder diameter with tight tolerances ensures accurate component positioning and reduces wear.
• Reliable Thread Engagement: Class 3A thread fit and UNC coarse threads provide superior holding power and easier assembly in high-vibration applications.
• Easy Installation in Confined Spaces: Hex socket head design allows for efficient tightening with standard tools, minimizing installation time.
• Compliance with Industry Standards: Meets ASME B18.3 specifications and is RoHS 3 & REACH compliant, ensuring global regulatory acceptance.

Professional Applications & Engineering Value

This 8-32 UNC shoulder screw is engineered to address critical challenges in precision assembly and machinery. The 18-8 stainless steel construction, combined with a passivated finish, offers excellent resistance to corrosion and oxidation, making it ideal for industrial environments exposed to moisture or chemicals. The 3/16" shoulder length with minimal tolerances provides a precise pivot or bearing surface, essential for aligning components in automation equipment, conveyor systems, and electronic enclosures. The integrated nylon patch thread locker secures the right-hand coarse threads against loosening under vibration, reducing downtime and maintenance costs. Its hex socket head facilitates quick installation in tight spaces, enhancing productivity while maintaining 70,000 psi tensile strength for reliable performance in high-stress applications.

Specification Summary & Compliance

This shoulder screw adheres to Class 3A thread fit and UNC coarse thread standards, ensuring precise dimensional accuracy with a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Manufactured in compliance with ASME B18.3 specifications, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in regulated industries without hazardous substances.