S-97345A564 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 environments and chemical exposure.
• Exceptional mechanical strength offering 70,000 psi tensile strength and 35,000 psi minimum shear strength for reliable, high-stress load-bearing.
• Precise alignment and secure positioning enabled by the knurled head and standard shoulder, preventing component rotation during assembly.
• Efficient installation and removal with a 3/16" hex socket drive, allowing for high-torque application in confined spaces.
• Consistent, reliable threading with Class 3A fit and 1/4"-20 UNC coarse threads, ensuring easy starting and vibration resistance.
• Compliance with rigorous industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing safety and environmental responsibility.
• Enhanced durability and wear resistance from Rockwell B79 hardness, extending service life in demanding industrial applications.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to solve critical alignment and fastening challenges in precision assemblies. Its knurled head texture provides superior grip, preventing slippage during torque application, while the standard shoulder acts as a precise spacer or pivot point in machinery, automotive, and electronic equipment. The 1/4"-20 UNC coarse thread and Class 3A thread fit ensure quick assembly and high vibration resistance, reducing maintenance needs. Made from corrosion-resistant 316 stainless steel, it performs reliably in moist or chemically aggressive environments, making it ideal for industrial applications requiring long-term durability and compliance with ASME B18.3 specifications.

Specification Summary & Compliance

This shoulder screw features precise dimensions including a 1/4"-20 UNC thread with Class 3A fit, a shoulder diameter of 3/8" (tolerance: -0.004" to -0.002"), and a shoulder length of 1/8" (tolerance: -0.005" to 0.005"). It is manufactured to meet ASME B18.3 standards and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability.