S-90318A203 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and passivated finish, ideal for harsh industrial environments.
• High mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable, long-lasting assemblies.
• Precise shoulder fit with 1/8" diameter and 3/8" length tolerances, ensuring accurate alignment and reduced vibration.
• Easy installation and removal via 5/64" hex drive and ultra-low socket head, saving time in assembly lines.
• Wide compatibility with 4-40 UNC coarse threads and Class 2A fit, suitable for standard industrial components.
• Enhanced durability from Rockwell B70 hardness, resisting wear in high-stress applications.
• Regulatory compliance with RoHS 3 and REACH standards, ensuring safe and eco-friendly usage.

Professional Applications & Engineering Value

This 316 Stainless Steel shoulder screw is engineered to address critical challenges in precision machinery, such as misalignment and corrosion-induced failures. The precise shoulder diameter and length provide stable pivoting and spacing in assemblies like rotating shafts and linkages, minimizing part movement and wear. With a passivated finish, it excels in moist or chemical-laden settings, preventing rust and extending service life. The 4-40 UNC coarse thread and hex drive enable quick fastening in tight spaces, boosting efficiency in automotive, aerospace, and electronics manufacturing. Its high tensile and shear strength ensures reliability under dynamic loads, reducing maintenance needs and downtime.

Specification Summary & Compliance

This shoulder screw adheres to Class 2A thread fit for consistent engagement and features a shoulder diameter tolerance of -0.001" to 0" and length tolerance of 0" to 0.002" for precise applications. Manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets environmental and safety standards for industrial use.