S-8077A483 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.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance in high-stress applications.
• Precise Class 3A thread fit ensures consistent, secure mating with components, reducing assembly issues and improving joint integrity.
• Enhanced grip and handling from the knurled head texture, allowing for easier manual installation and removal without slippage.
• Durable socket head design with a 5/64" hex drive provides high torque resistance and reduces the risk of stripping during tightening.
• Accurate shoulder dimensions with tight tolerances for reliable alignment and spacing in precision assemblies like pivots and rotating parts.
• Compliance with environmental regulations including RoHS 3 and REACH, ensuring safety and suitability for global industrial markets.

Professional Applications & Engineering Value

This 4-40 UNC thread shoulder screw is engineered to address critical needs in precision machinery and industrial equipment. The 316 Stainless Steel material provides excellent resistance to corrosion and chemicals, making it suitable for applications in marine, chemical processing, and outdoor environments where durability is paramount. The Black Oxide finish adds an extra layer of protection against oxidation while reducing light reflection. With a Class 3A thread fit and precise shoulder dimensions, it ensures minimal play and reliable alignment in assemblies such as bearings, linkages, and electronic enclosures. The knurled head and socket drive facilitate secure installation, reducing the risk of damage during maintenance. Ideal for precision shoulder mounting solutions, this screw enhances operational reliability and reduces downtime in demanding B2B settings.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A fit for high precision. Key dimensions include a thread size of 4-40, shoulder diameter of 1/8" (tolerance: -0.004" to -0.002"), and shoulder length of 1 7/8" (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. Manufactured to deliver consistent performance with a hardness of Rockwell B79, it supports reliable use in technical applications requiring strict adherence to dimensional and material standards.