S-8077A474 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and extended service life.
• Enhanced durability and wear resistance from the Black Oxide finish, providing added protection against oxidation and abrasion.
• High tensile strength of 70,000 psi ensures reliable performance under heavy loads and demanding mechanical stresses.
• Precise Class 3A thread fit for secure, vibration-resistant assemblies with minimal play in critical applications.
• Easy installation and removal with a hex drive (5/64") and knurled head, allowing for better grip and torque application.
• Versatile shoulder design with a 1 1/2" length for accurate alignment and spacing in machinery and rotating components.
• Compliance with RoHS 3 and REACH regulations ensures environmental safety and meets global industry standards.

Professional Applications & Engineering Value

This 4-40 UNC thread shoulder screw in 316 stainless steel with a Black Oxide finish addresses common industrial challenges such as corrosion in humid or chemical-exposed settings. The coarse threading and Class 3A fit provide excellent resistance to loosening under vibration, making it ideal for precision assemblies in machinery, automotive, and electronics. The knurled head and hex drive facilitate quick maintenance, while the robust shoulder design ensures accurate component alignment, reducing wear and improving operational efficiency in high-stress applications.

Specification Summary & Compliance

This shoulder screw adheres to UNC coarse thread standards with a Class 3A thread fit for tight tolerances. Key dimensions include a shoulder diameter of 1/8" (tolerance: -0.004" to -0.002") and length of 1 1/2" (tolerance: -0.005" to 0.005"). It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for regulated industries.