S-97768A135 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments.
• Enhanced durability and wear resistance from the Black Oxide finish, providing a protective layer against abrasion.
• Superior load-bearing capacity with a tensile strength of 70,000 psi and shear strength of 35,000 psi for reliable performance.
• Precise alignment and secure pivoting ensured by the 1/8" shoulder diameter with tight tolerance control.
• Easy installation and removal using the standard hex drive and knurled head for improved grip.
• High thread reliability with Class 3A fit and coarse UNC threads, reducing the risk of cross-threading.
• Compliance with environmental standards including RoHS 3 and REACH, ensuring safe and sustainable use.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address critical alignment and rotational needs in precision assemblies. Made from 18-8 Stainless Steel and finished with Black Oxide, it resists corrosion and wear in demanding conditions like machinery, automotive, and electronics. The 1/8" shoulder diameter and 3/8" shoulder length provide a stable pivot point, minimizing misalignment and reducing stress on components. With a Class 3A thread fit and coarse UNC threads, it ensures fast, secure fastening in high-vibration applications, enhancing operational efficiency and longevity in industrial settings.

Specification Summary & Compliance

The screw features precise dimensions, including a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005", ensuring consistent performance. It adheres to UNC thread standards with a Class 3A fit for superior thread engagement. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets environmental and safety requirements for industrial use.