S-8077A467 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh or marine environments.
• Enhanced durability and wear resistance provided by the black oxide finish, extending the screw's service life.
• High-strength performance with 70,000 psi tensile and 35,000 psi shear strength for demanding mechanical applications.
• Precise and secure fit ensured by the Class 3A thread fit, minimizing backlash and improving assembly reliability.
• Easy and secure installation with a 5/64" hex socket drive and knurled head for superior grip and torque application.
• Versatile shoulder design featuring a consistent 1/8" diameter and 3" length to act as a reliable pivot, spacer, or axle.
• Compliance with strict environmental regulations including RoHS 3 and REACH, ensuring safety and global market acceptance.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to solve critical alignment and wear challenges in industrial assemblies. The 316 stainless steel material provides exceptional resistance to chemicals and saltwater corrosion, making it a top choice for marine equipment, chemical processing plants, and food machinery. The coarse UNC thread and Class 3A fit ensure rapid assembly with high clamping force and vibration resistance, which is vital for automated machinery and precision instruments. The black oxide finish not only adds an extra layer of corrosion protection but also reduces galling and friction during operation. The long, 3-inch shoulder acts as a stable bearing surface or pivot point in linkages, gears, and rotating assemblies, reducing component wear and simplifying design. Its high tensile and shear strength guarantees reliability under dynamic loads, making it an indispensable component for engineers seeking longevity and precision.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for precise dimensional accuracy. The shoulder diameter is 1/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 3" with a tolerance of -0.005" to 0.005". It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for global industrial use.