S-8077A624 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction, ideal for harsh environments and moisture exposure.
• Exceptional mechanical strength providing 70,000 psi tensile and 35,000 psi shear strength for high-load applications.
• Precise alignment and smooth rotation enabled by the 3/8" shoulder diameter with tight tolerance control.
• Enhanced grip and tool engagement from the knurled socket head and 3/16" hex drive, preventing slippage during installation.
• Reliable thread performance with Class 3A fit UNC coarse threads, ensuring secure fastening and vibration resistance.
• Durable, wear-resistant surface thanks to the black oxide finish, which also reduces light reflection.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH for guaranteed quality and safety.

Professional Applications & Engineering Value

This 316 Stainless Steel shoulder screw is engineered to address critical challenges in industrial applications where precision, strength, and corrosion resistance are paramount. The black oxide finish not only enhances durability but also minimizes galling and wear in high-friction assemblies. Its UNC coarse threading and Class 3A fit provide excellent engagement in soft materials or where rapid assembly is required, reducing the risk of cross-threading. The knurled socket head with a hex drive ensures secure tool engagement, preventing cam-out and enabling high torque application. Commonly used in machinery, pivoting mechanisms, and precision shoulder bolt applications, this fastener offers reliable performance in automotive, marine, and chemical processing equipment, where exposure to corrosive elements is a constant concern.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for superior precision and a coarse UNC thread (5/16"-18). The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 11/16" with a tolerance of -0.005" to 0.005". It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards for industrial use.