S-97345A604 1/4"-28 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial and marine environments.
• High mechanical strength and durability with 70,000 psi tensile and 35,000 psi shear strength for demanding applications.
• Precise alignment and smooth rotation ensured by the Class 3A thread fit and standard shoulder fit.
• Secure, non-slip fastening provided by the knurled socket head and 3/16" hex drive.
• Reliable performance in regulated industries with compliance to RoHS 3 and REACH standards.
• Extended service life due to the fine UNF thread and Rockwell B79 hardness.
• Guaranteed dimensional accuracy and interchangeability, manufactured to ASME B18.3 specifications.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to solve critical alignment and wear issues in machinery. Its 1-1/2" shoulder length acts as a precise axle or pivot, reducing friction and bearing wear in assemblies. The 1/4"-28 UNF fine thread and Class 3A fit provide superior vibration resistance and clamping force in high-stress environments like automotive, aerospace, and precision equipment. The knurled socket head ensures a firm grip for installation, even in oily conditions. Made from corrosion-resistant 316 stainless steel, it delivers long-term reliability in corrosive settings, making it an essential industrial fastener for durable and maintenance-free operation.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit and adheres to the ASME B18.3 standard for dimensional consistency. The shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -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 requirements for industrial use.