S-8077A845 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance from 316 stainless steel material, ideal for harsh industrial environments and chemical exposure.
• Superior strength and durability with 70,000 psi tensile and 35,000 psi shear strength, ensuring reliable performance under high-stress conditions.
• Precise alignment and reduced wear due to the Class 3A thread fit and standard shoulder fit, providing excellent dimensional stability.
• Enhanced grip and anti-loosening properties from the knurled head texture, allowing for secure manual adjustments in assembly.
• Easy installation and removal with the 5/32" hex socket drive, compatible with standard tools for efficient maintenance.
• Improved wear resistance and reduced glare thanks to the black oxide finish, extending service life in mechanical applications.
• Broad compatibility and reliability with 1/4"-20 UNC coarse threads, designed for quick assembly in various industrial components.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and rotating assemblies. The black oxide finish not only enhances corrosion resistance but also minimizes friction and galling in high-movement applications. With a Class 3A thread fit and UNC coarse threads, it ensures rapid, secure fastening in industrial equipment, reducing assembly time and preventing thread stripping. The 15/16" shoulder length provides accurate pivot points and bearing surfaces, essential for maintaining alignment in linkages, gears, and pivots. Its high tensile strength and Rockwell B79 hardness make it suitable for heavy-duty uses where vibration and load stresses are common, offering long-term reliability and reduced maintenance costs.

Specification Summary & Compliance

This shoulder screw features precise dimensional tolerances, including a shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005", ensuring consistent performance. It adheres to ASME B18.3 specifications for socket head shoulder screws and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material integrity for global industrial applications.