S-8077A494 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and Black Oxide finish, ideal for harsh environments and extended service life.
• High mechanical strength and reliability with a tensile strength of 70,000 psi and a shear strength of 35,000 psi, ensuring secure fastening under load.
• Precise Class 3A thread fit for consistent, reliable engagement and reduced risk of cross-threading in assembly.
• Enhanced grip and tool engagement from the knurled socket head and 5/64" hex drive, preventing slippage during installation.
• Accurate alignment and spacing provided by the 7/16" shoulder with tight tolerances, crucial for pivot points and rotating components.
• Broad industrial compatibility with UNC coarse threads and right-hand direction, suitable for standard machinery and equipment.
• Compliance with environmental regulations including RoHS 3 and REACH, ensuring safety and sustainability in global supply chains.

Professional Applications & Engineering Value

This 4-40 UNC thread shoulder screw is engineered to address critical challenges in industrial assembly, such as misalignment and corrosion-induced failure. Made from 316 Stainless Steel with a Black Oxide finish, it offers exceptional resistance to chemicals and moisture, prolonging component life in demanding settings like marine or chemical processing equipment. The Class 3A thread fit and coarse UNC thread design ensure quick, secure fastening, reducing assembly time and improving reliability. The knurled socket head with a hex drive allows for high-torque installation without stripping, while the precise shoulder diameter and length provide stable bearing surfaces for rotating parts, minimizing wear and maintenance in machinery, automotive, and electronics applications.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A fit for high precision, featuring a thread diameter of 0.112" and length of 5/32". The shoulder maintains tight tolerances (diameter: -0.004" to -0.002"; length: -0.005" to 0.005") to ensure consistent performance. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting safe and environmentally responsible industrial use.