S-8077A475 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and outdoor applications.
• Enhanced durability and wear resistance from the Black Oxide finish, which also reduces light reflection and provides a sleek appearance.
• Precise alignment and smooth rotation ensured by the Class 3A thread fit and standard shoulder, minimizing play in assemblies.
• High-strength performance with a tensile strength of 70,000 psi and minimum shear strength of 35,000 psi, supporting heavy-duty mechanical loads.
• Easy installation and removal using a standard 5/64" hex drive and knurled head for improved grip and torque application.
• Reliable coarse threading (4-40 UNC) for quick assembly and reduced cross-threading risks in high-vibration settings.
• Compliance with environmental and safety standards including RoHS 3 and REACH, ensuring safe use in regulated industries.

Professional Applications & Engineering Value

This 316 Stainless Steel Shoulder Screw with a Black Oxide finish is engineered to address common industrial challenges such as corrosion, misalignment, and mechanical stress. The 4-40 UNC coarse thread and Class 3A fit provide exceptional precision, reducing assembly time and preventing thread damage in automated equipment, machinery, and precision instruments. The 2 1/2" shoulder length and standard shoulder diameter ensure accurate component spacing and smooth rotational movement, making it ideal for pivots, guides, and bearing supports. Its high tensile strength (70,000 psi) and corrosion-resistant properties make it suitable for demanding applications in marine, chemical processing, and aerospace sectors, where reliability and longevity are critical.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A fit for tight tolerances and reliable performance. Key dimensions include a shoulder diameter of 1/8" (tolerance: -0.004" to -0.002") and shoulder length of 2 1/2" (tolerance: -0.005" to 0.005"). It is manufactured from 316 Stainless Steel with a Rockwell B79 hardness and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental safety and regulatory adherence for industrial use.