S-91829A522 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Precise component alignment ensured by the 1/2" shoulder length with tight tolerance for reduced vibration and wear
• High tensile strength of 70,000 psi provides reliable fastening under mechanical stress
• Rockwell B55 hardness offers excellent durability and resistance to deformation
• Class 2A thread fit with UNC coarse threads enables quick assembly and secure holding power
• Socket head design allows for easy installation in confined spaces with standard tools
• Compliance with RoHS 3 and REACH regulations ensures environmental safety and global market acceptance

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address critical alignment and stability challenges in precision assemblies. The 18-8 stainless steel material combined with a passivated finish resists oxidation and chemical exposure, making it suitable for medical devices, aerospace components, and automated machinery. The 1/2" shoulder length with precise fit tolerance prevents lateral movement, reducing wear on rotating parts and ensuring consistent performance in high-vibration applications. Its coarse thread design and Class 2A fit facilitate rapid installation while maintaining strong thread engagement, streamlining production processes and minimizing downtime.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent dimensional accuracy. The shoulder diameter tolerance is -0.001" to 0", and shoulder length tolerance is 0" to 0.002", ensuring precise assembly. It conforms to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing compliance with environmental and safety requirements for industrial use.