S-97345A227 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 chemical exposure.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance in high-stress applications.
• Precise Class 3A thread fit ensures tight, secure fastening with minimal backlash in assemblies requiring high accuracy.
• Enhanced grip and anti-slip handling from the knurled socket head, facilitating easier installation and removal with standard hex tools.
• Robust shoulder design provides stable bearing surfaces and precise alignment for rotating components like gears and pulleys.
• Broad regulatory compliance including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental standards are met.
• Coarse UNC thread enables quick assembly and disassembly, reducing installation time in industrial maintenance and production.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address common industrial challenges such as component misalignment, corrosion-induced failure, and the need for repeated maintenance. The UNC coarse thread and Class 3A fit provide a secure, vibration-resistant connection, critical in machinery where precision is paramount. The knurled socket head enhances tool engagement, preventing slippage during torque application in confined spaces. With a high tensile strength of 70,000 psi, it supports heavy-duty applications like automotive assemblies, conveyor systems, and robotic arms, ensuring long-term reliability and reduced downtime. Its compliance with ASME B18.3 and environmental regulations makes it a trusted choice for engineers seeking durable, compliant fastening solutions.

Specification Summary & Compliance

This shoulder screw features precise dimensions including a 5/16"-18 UNC coarse thread with Class 3A fit for tight tolerances, a shoulder diameter of 3/8" with tolerance of -0.004" to -0.002", and a shoulder length of 1-3/8" with tolerance of -0.005" to 0.005". It meets ASME B18.3 specifications for dimensional accuracy and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring it is free from hazardous substances and suitable for global industrial use.