S-97768A343 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel and black oxide finish, ideal for harsh industrial environments.
• High-strength performance with 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding applications.
• Precise thread fit with Class 3A UNC coarse threads ensuring reliable, vibration-resistant connections.
• Easy installation and removal thanks to the 3/16" hex drive and knurled head for improved grip.
• Durable construction with Rockwell B55 hardness, offering long-term reliability under stress.
• Compliance with industry standards including ASME B18.3, RoHS, and REACH for safe, regulated use.
• Accurate shoulder dimensions with tight tolerances for consistent alignment in assemblies.

Professional Applications & Engineering Value

This shoulder screw is engineered to address common industrial challenges like misalignment, corrosion, and mechanical failure. Made from 18-8 stainless steel with a black oxide finish, it resists rust and wear in demanding settings such as machinery, automotive, and electronics. The UNC coarse thread and Class 3A fit provide secure fastening with minimal loosening from vibrations, while the knurled head and hex drive simplify maintenance. Ideal for pivot points, spacers, and rotating assemblies, it ensures precise shoulder diameter and length for stable component support, reducing downtime and enhancing operational efficiency.

Specification Summary & Compliance

This shoulder screw features a 5/16"-18 UNC thread with Class 3A fit for high precision, and shoulder dimensions include a diameter of 3/8" with tolerances of -0.004" to -0.002" and length of 1/8" with -0.005" to 0.005" tolerance. It meets ASME B18.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industry-standard reliability.