S-90318A403 10-32 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction and passivated finish, ideal for harsh environments and extended service life.
• Precise component alignment ensured by the smooth, precisely toleranced shoulder diameter and length, minimizing assembly play and vibration.
• High-strength performance delivering 70,000 psi tensile and 35,000 psi shear strength for reliable load-bearing in demanding applications.
• Secure, low-profile fastening with the ultra-low socket head and hex drive, allowing for flush installation and high torque application in confined spaces.
• Consistent and reliable threading with a Class 2A fit UNF fine thread, promoting smooth engagement and reducing the risk of cross-threading.
• Enhanced durability from a Rockwell B70 hardness, providing excellent resistance to wear and deformation.
• Compliance with global standards, being RoHS 3 and REACH compliant, ensuring material safety and environmental responsibility for international projects.

Professional Applications & Engineering Value

This 10-32 UNF precision shoulder screw is engineered to address critical alignment and stability challenges in industrial assemblies. The 316 stainless steel material, combined with a passivated finish, offers exceptional resistance to corrosion from chemicals, moisture, and salt spray, making it ideal for marine, chemical processing, and food machinery applications. The precise shoulder fit with tight tolerances on diameter and length ensures accurate positioning of moving parts like gears, pulleys, and linkages, reducing wear and preventing misalignment. The ultra-low socket head and hex drive facilitate easy installation in space-constrained areas while maintaining a clean, flush profile. Its fine UNF thread and Class 2A fit provide secure, vibration-resistant fastening, essential for high-precision equipment where reliability is paramount.

Specification Summary & Compliance

This shoulder screw adheres to Class 2A thread fit and inch system tolerances, ensuring dimensional accuracy for the 10-32 UNF fine thread, 1/4" shoulder diameter (-0.001" to 0" tolerance), and 1/2" shoulder length (0" to 0.002" tolerance). Manufactured from 316 stainless steel with a passivated finish, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming it is free from hazardous substances and suitable for regulated industries.