S-91327A173 3/8"-16 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel and passivated finish, ideal for harsh environments.
• High-strength performance offering 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications.
• Secure, vibration-resistant locking via an integrated nylon patch that maintains integrity from -50° to 250°F.
• Precise alignment and smooth rotation ensured by a 1/2" shoulder diameter with tight tolerances.
• Easy installation and removal with a standard hex socket drive and knurled head for better grip.
• Reliable thread engagement with Class 3A UNC coarse threads for quick assembly and high load capacity.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for safe, quality-assured use.

Professional Applications & Engineering Value

This 3/8"-16 UNC shoulder screw is engineered to address common industrial challenges such as misalignment, vibration loosening, and corrosion in machinery. Made from durable 18-8 stainless steel with a passivated finish, it resists rust and wear in demanding settings like automotive assemblies, precision equipment, and conveyor systems. The 1/2" shoulder diameter provides a stable bearing surface, reducing wear on moving parts, while the nylon patch thread locker ensures secure fastening under thermal fluctuations and dynamic loads. Its hex socket head and coarse UNC threads facilitate quick installation, making it a reliable choice for high-stress applications requiring repeatable precision and longevity.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit for precise engagement, with shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". It conforms to ASME B18.3 standards and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring environmental safety and regulatory adherence for industrial use.