S-90325A153 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction and passivated finish, ensuring longevity in harsh environments
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable performance under high stress
• Precise shoulder alignment with 1/8" diameter and tight tolerances (-0.001" to 0") for accurate component positioning
• Easy installation and removal using a standard 5/64" hex drive socket head, reducing assembly time
• Wide compatibility with UNC coarse threads and Class 2A fit, ensuring secure fastening in various industrial applications
• Regulatory compliance with RoHS 3 and REACH standards, making it safe for global manufacturing use
• Durable thread design with right-hand coarse threading and 5/16" length for enhanced grip and vibration resistance

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. The 18-8 Stainless Steel material, combined with a passivated finish, provides excellent resistance to rust and chemical exposure, making it ideal for machinery, electronics, and automotive components. The 1/8" shoulder diameter with precise tolerances ensures accurate spacing and rotational stability, reducing wear and misalignment in moving parts. With a socket head design and hex drive, it allows for quick, tool-friendly installation in confined spaces, streamlining production workflows. Its 70,000 psi tensile strength and coarse thread configuration offer reliable fastening in high-vibration environments, enhancing overall system integrity and reducing maintenance needs.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent engagement and ease of assembly. Dimensions include a shoulder diameter of 1/8" (tolerance: -0.001" to 0") and shoulder length of 3/8" (tolerance: 0" to 0.002"), ensuring precision in manufacturing. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and suitability for industrial applications worldwide.