S-97768A350 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and black oxide finish, ensuring long-term reliability in harsh industrial environments.
• High-strength performance delivering 70,000 psi tensile and 35,000 psi shear strength for demanding mechanical applications requiring robust load-bearing capabilities.
• Precise Class 3A thread fit providing tighter tolerances and secure fastening with reduced risk of loosening under vibration or dynamic loads.
• Easy installation and removal thanks to the 3/16" hex drive and knurled head design, offering superior grip and torque application without slippage.
• Dimensional stability with controlled shoulder diameter and length tolerances, ensuring consistent alignment and fit in precision assemblies.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality, safety, and environmental responsibility.
• Versatile coarse UNC threading enabling quick assembly and disassembly while maintaining strong holding power in various materials.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical alignment and load distribution challenges in industrial machinery, automotive systems, and precision equipment. The 18-8 stainless steel base material combined with a black oxide finish provides excellent resistance to corrosion and wear, extending service life in demanding conditions. The Class 3A thread fit and precise shoulder dimensions ensure minimal play and reliable positioning, reducing assembly errors and maintenance downtime. Ideal for pivots, axles, and spacers, this fastener's 70,000 psi tensile strength and knurled head enhance security in high-vibration environments, while compliance with ASME B18.3 standards assures consistent performance for OEM and MRO applications.

Specification Summary & Compliance

This shoulder screw features a 5/16"-18 UNC coarse thread with Class 3A fit for precision threading, a shoulder diameter of 3/8" with tight tolerance control, and a hardness of Rockwell B55. It is manufactured in accordance with ASME B18.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards for global industrial use.