S-97345A579 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 environments and chemical exposure.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under high-stress conditions.
• Precise Class 3A thread fit ensures tight tolerances and secure fastening, minimizing backlash in precision assemblies.
• Enhanced grip and anti-slip installation provided by the knurled socket head and 5/32" hex drive, reducing tool slippage.
• Optimized for heavy-duty applications with Rockwell B79 hardness, delivering excellent wear resistance and long service life.
• Broad compatibility with 1/4"-20 UNC coarse threads and standard shoulder dimensions, facilitating easy integration into existing systems.
• Full regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in industrial machinery, automation, and precision equipment. The Class 3A thread fit and coarse UNC threading provide robust, vibration-resistant connections, essential for maintaining alignment in rotating assemblies and linkages. The knurled socket head with a 5/32" hex drive ensures secure tool engagement, reducing installation errors in confined spaces. With high tensile and shear strength, it supports demanding applications like pivots, axles, and guides, where wear resistance and corrosion protection are paramount. Its compliance with ASME B18.3 guarantees dimensional consistency, making it a reliable choice for OEMs and maintenance teams seeking durability and precision in industrial shoulder bolt applications.

Specification Summary & Compliance

This shoulder screw features precise dimensions including a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005", ensuring high accuracy for Class 3A thread fits. It adheres to UNC coarse thread standards and is manufactured in compliance with ASME B18.3 specifications. The product is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting stringent environmental and safety regulations for industrial use.