S-97345A541 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 reliable performance in demanding applications.
• Precise Class 3A thread fit ensures tight tolerances and secure fastening, reducing the risk of loosening under vibration.
• Enhanced grip and torque application from the knurled socket head and 5/32" hex drive, preventing tool slippage during installation.
• Durable shoulder design with consistent diameter and length tolerances, providing stable alignment for rotating components.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory adherence.
• Coarse UNC threading allows for quick assembly and disassembly, improving maintenance efficiency.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy-duty equipment. The Class 3A thread fit and UNC coarse thread provide exceptional holding power and resistance to vibrational loosening, making it ideal for applications like rotating shafts, pivots, and guides. The knurled socket head with a 5/32" hex drive ensures maximum torque transmission without cam-out, while the robust shoulder maintains exact alignment under load. Its high tensile and shear strength supports prolonged use in corrosive or high-stress environments, reducing downtime and maintenance costs. Compliant with ASME B18.3 and environmental regulations, it offers reliability for industries such as aerospace, automotive, and manufacturing.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC thread with Class 3A fit for precise engagement, and adheres to ASME B18.3 manufacturing standards. The shoulder diameter and length maintain tight tolerances (e.g., diameter: -0.004" to -0.002", length: -0.005" to 0.005") to ensure consistent performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing safety and environmental responsibility in industrial applications.