S-97345A233 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 environments and extended service life.
• Precise component alignment and rotation enabled by the 3" long shoulder with a controlled diameter tolerance.
• High-strength fastening with a tensile strength of 70,000 psi and shear strength of 35,000 psi for demanding applications.
• Reliable, vibration-resistant thread engagement from the Class 3A fit and coarse 5/16"-18 UNC thread.
• Secure and easy installation with a knurled head and 3/16" hex socket drive, preventing tool slippage.
• Consistent quality and interchangeability guaranteed by compliance with the ASME B18.3 standard.
• Safe for regulated industries as it is RoHS 3 and REACH compliant, meeting environmental and safety directives.

Professional Applications & Engineering Value

This 316 Stainless Steel shoulder screw is engineered to solve critical alignment and wear problems in machinery. The 3" shoulder length acts as a precise axle or pivot, reducing wear on moving parts by providing a smooth, hardened bearing surface. The coarse UNC thread and Class 3A fit ensure a tight, secure connection that resists loosening under vibration, making it ideal for assembly jigs, linkages, and rotating mechanisms. The combination of high tensile strength and excellent corrosion resistance ensures long-term reliability in industrial, automotive, and marine environments, minimizing maintenance downtime and replacement costs.

Specification Summary & Compliance

This screw features a 5/16"-18 UNC thread with a Class 3A fit for precision. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 3" with a tolerance of -0.005" to 0.005". It is manufactured to meet ASME B18.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations.