S-97345A578 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 extended service life
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for high-stress applications
• Precise Class 3A thread fit ensures secure, vibration-resistant fastening with reliable performance
• Convenient hex socket drive with a knurled head for enhanced grip and easy installation in confined spaces
• Durable Rockwell B79 hardness provides excellent wear resistance and maintains integrity under load
• Accurate 1/2" shoulder length with tight tolerances for precise component alignment and spacing
• Broad compliance with ASME B18.3, RoHS 3, and REACH standards, ensuring quality and environmental safety

Professional Applications & Engineering Value

This 316 Stainless Steel shoulder screw is engineered to address critical challenges in industrial assembly, such as misalignment and component wear. The 1/4"-20 UNC coarse thread with a Class 3A fit delivers secure, vibration-resistant connections, reducing maintenance needs in machinery and equipment. Its knurled socket head allows for easy torque application, even in tight spaces, while the precise shoulder diameter and length ensure accurate positioning of parts like gears and pulleys. With high tensile and shear strength, it supports heavy loads in applications ranging from automotive systems to precision instruments, enhancing durability and operational reliability.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC coarse thread with Class 3A fit for high precision, and a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005" for consistent performance. It meets ASME B18.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring adherence to industry and environmental regulations.