S-97345A231 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 industrial environments and chemical exposure.
• Exceptional mechanical strength with 70,000 psi tensile and 35,000 psi shear strength, ensuring reliable performance under heavy loads.
• Precise alignment and smooth rotation provided by the 2 1/2" shoulder with tight diameter tolerance, reducing wear on mating parts.
• Secure, high-precision threading with Class 3A UNC coarse thread fit, offering excellent vibration resistance and easy assembly.
• Easy installation and removal using the 3/16" hex drive and knurled head, allowing for firm grip and efficient torque application.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory acceptance.
• Durable, long-lasting performance backed by Rockwell B79 hardness, maintaining integrity in demanding applications.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and assembly jigs. The UNC coarse thread and Class 3A fit provide superior resistance to loosening under vibration, a common issue in dynamic industrial settings. The 2 1/2" shoulder length and controlled diameter tolerance ensure exact component alignment, minimizing misalignment and reducing wear on bushings or bearings. With its knurled head and hex drive, it allows for quick, secure fastening in confined spaces, enhancing assembly efficiency. The corrosion-resistant properties of 316 stainless steel make it suitable for applications exposed to moisture, chemicals, or outdoor conditions, delivering reliable performance in industries like aerospace, medical equipment, and food processing.

Specification Summary & Compliance

This shoulder screw features a 5/16"-18 UNC thread with Class 3A fit for high precision, a shoulder diameter of 3/8" with tolerance of -0.004" to -0.002", and a shoulder length of 2 1/2" with tolerance of -0.005" to 0.005". It complies with ASME B18.3 specifications for dimensional accuracy and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring adherence to environmental and safety regulations.