S-97345A243 1/4"-20 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 offering 70,000 psi tensile and 35,000 psi shear strength for demanding, heavy-duty applications.
• Precise Class 3A thread fit ensures tight tolerances and reliable assembly in high-vibration settings.
• Easy installation and removal with a 3/16" hex socket drive and knurled head for improved grip.
• Durable UNC coarse threads provide faster assembly and reduced cross-threading risk.
• Compliance with ASME B18.3 standards guarantees consistent quality and interchangeability.
• RoHS 3 and REACH compliant for use in regulated industries without hazardous substances.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and assembly fixtures. Its Class 3A thread fit and UNC coarse thread design minimize play and enhance load distribution, reducing wear in high-cycle applications. The knurled head and hex socket drive allow for secure tool engagement, even in confined spaces. With excellent corrosion resistance, it performs reliably in chemical processing, food equipment, and outdoor installations, while the shoulder diameter and length tolerances ensure precise alignment for rotating components and linkages.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC thread with Class 3A fit, a shoulder diameter of 3/8" (tolerance: -0.004" to -0.002"), and shoulder length of 1/2" (tolerance: -0.005" to 0.005"). It meets ASME B18.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are upheld.