S-8077A861 1/4"-28 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 316 stainless steel and black oxide finish, ideal for harsh industrial environments
• Precise alignment and reduced assembly wear with Class 3A thread fit and standard shoulder fit for consistent performance
• High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
• Enhanced grip and tool engagement due to knurled head texture and 5/32" hex drive for secure installation
• Reliable fine thread performance with 1/4"-28 UNF thread providing superior vibration resistance
• Durable construction featuring Rockwell B79 hardness for long-term mechanical integrity
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for quality and safety

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw with black oxide finish delivers exceptional performance in precision mechanical assemblies where corrosion resistance and dimensional stability are critical. The 1/4"-28 UNF fine thread provides superior vibration resistance in rotating equipment, while the 1-1/4" shoulder length ensures precise component spacing in linkages, pivots, and bearing applications. The knurled head texture combined with hex drive design facilitates secure installation in confined spaces, making it ideal for industrial machinery, automotive systems, and precision instruments requiring reliable shoulder bolt performance under demanding conditions.

Specification Summary & Compliance

Manufactured to exacting standards with Class 3A thread fit and shoulder diameter tolerance of -0.004" to -0.002" for precision alignment. Complies with ASME B18.3 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors while maintaining consistent quality and reliability.