S-8077A619 5/16"-18 ASME B18.3 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 under high-stress conditions.
• Precise thread engagement with Class 3A fit and UNC coarse threads for faster assembly and reduced risk of cross-threading.
• Secure, non-slip installation facilitated by the knurled socket head and standard hex drive, allowing for high torque application.
• Accurate component alignment due to the precisely toleranced shoulder diameter and length, ensuring stable assemblies.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality and environmental safety.
• Enhanced durability and hardness with a Rockwell B79 rating, providing excellent wear resistance in demanding applications.

Professional Applications & Engineering Value

This 5/16"-18 UNC shoulder screw is engineered to address critical challenges in precision assemblies, such as maintaining alignment in rotating machinery, securing components in conveyor systems, and providing pivot points in industrial automation. The 316 stainless steel material, combined with the black oxide finish, offers superior protection against corrosion and chemical exposure, making it suitable for marine, chemical processing, and food-grade environments. The Class 3A thread fit and coarse thread design ensure quick, reliable fastening, reducing assembly time and minimizing the risk of thread damage. The knurled socket head and hex drive allow for secure tool engagement, preventing slippage during high-torque installations. This shoulder screw is ideal for applications requiring precise shaft positioning, such as in bearings, gears, and linkages, where dimensional stability and high tensile strength are paramount.

Specification Summary & Compliance

This shoulder screw adheres to Class 3A thread fit for high precision, with UNC coarse thread specifications (5/16"-18). Manufacturing conforms to ASME B18.3 standards, ensuring dimensional accuracy for the shoulder diameter (3/8" with tolerance -0.004" to -0.002") and shoulder length (5/16" with tolerance -0.005" to 0.005"). The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental responsibility for industrial use.