S-97345A576 1/4"-28 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, reducing the risk of loosening in critical assemblies.
• Enhanced grip and torque application from the knurled socket head and 3/16" hex drive, allowing for easy installation and removal.
• Accurate alignment and spacing provided by the 1/4" shoulder length with standard fit, facilitating precise component positioning.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory adherence for global use.
• Durable fine UNF thread design (1/4"-28) for improved load distribution and vibration resistance in demanding applications.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address common industrial challenges such as misalignment, corrosion, and mechanical failure. The Class 3A thread fit and fine UNF thread provide superior clamping force and vibration resistance, making it ideal for precision machinery, automotive assemblies, and electronic enclosures. The knurled socket head enhances tool engagement, reducing slippage during installation in tight spaces. With a Rockwell B79 hardness and high tensile strength, it withstands repetitive loads and harsh conditions, ensuring long-term reliability. Its compliance with ASME B18.3 and environmental regulations like RoHS and REACH makes it a trusted choice for OEMs and maintenance teams seeking durable, compliant fasteners.

Specification Summary & Compliance

This shoulder screw features precise dimensions, including a 1/4"-28 UNF fine thread with Class 3A fit for tight tolerances, a shoulder diameter of 3/8" with tolerance from -0.004" to -0.002", and a shoulder length of 1/4" with tolerance from -0.005" to 0.005". It meets ASME B18.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring it adheres to industry standards for safety and environmental responsibility.