S-97768A366 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ensuring long-term reliability in harsh industrial environments.
• Enhanced wear resistance and reduced light reflection thanks to the black oxide finish, providing better durability and discreet appearance.
• High-strength performance with 70,000 psi tensile strength and 35,000 psi minimum shear strength, offering reliable load-bearing capacity for demanding applications.
• Precise alignment and smooth rotation enabled by the 1" shoulder length with tight tolerances, minimizing assembly errors and improving operational efficiency.
• Secure, non-slip fastening due to the knurled socket head and hex drive, allowing for easy installation and removal with standard tools.
• Consistent thread engagement with Class 3A fit and coarse UNC thread, ensuring vibration resistance and reduced loosening over time.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing safety, quality, and environmental responsibility.

Professional Applications & Engineering Value

This shoulder screw is engineered to address common industrial challenges such as misalignment, component wear, and corrosion in machinery. The 18-8 stainless steel material provides excellent resistance to rust and chemicals, making it ideal for applications in automotive, aerospace, and manufacturing equipment where exposure to moisture or aggressive substances is common. The black oxide finish not only enhances corrosion protection but also reduces galling during assembly. With its 1" shoulder length and precise shoulder diameter, it acts as a pivot or spacer, ensuring accurate positioning of moving parts like gears and linkages. The coarse UNC thread and Class 3A fit offer quick installation and high vibration resistance, reducing maintenance downtime. This design is perfect for industrial fastening in robotics, conveyor systems, and precision instruments, where reliability and durability are critical.

Specification Summary & Compliance

This shoulder screw features a 5/16"-18 UNC thread with Class 3A thread fit for precise tolerance, and a shoulder diameter of 3/8" with tolerances from -0.004" to -0.002". The shoulder length is 1" with a tolerance of -0.005" to 0.005", ensuring consistent performance. It meets ASME B18.3 specifications for dimensional accuracy and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, confirming it is free from hazardous substances and safe for various industrial uses.