S-90298A747 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh environments and extended service life.
• Precise alignment and reduced wear thanks to the knurled head and standard shoulder, ensuring secure positioning in assemblies.
• High-strength performance with Rockwell B55 hardness, providing reliable durability under mechanical stress.
• Easy installation and removal using the 5/16" hex drive, compatible with standard tools for efficient maintenance.
• Accurate thread engagement with Class 3A fit and UNC coarse thread, minimizing the risk of cross-threading and ensuring tight fastening.
• Broad regulatory compliance including ASME B18.3 standards, RoHS, and REACH, meeting strict industrial and environmental requirements.
• Consistent dimensional stability with tight shoulder tolerances (e.g., diameter within -0.001" to 0.001"), enhancing assembly reliability.

Professional Applications & Engineering Value

This 18-8 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy-duty equipment. The passivated finish enhances corrosion resistance, making it suitable for moist or chemically aggressive environments, while the knurled head improves grip during manual adjustments. With a 1/2"-13 UNC coarse thread and Class 3A thread fit, it ensures rapid assembly and high clamping force, reducing the risk of loosening in vibrating applications. The integrated shoulder provides exact axial positioning, minimizing misalignment and wear in rotating components like bearings and pulleys. Ideal for use in robotics, conveyor systems, and industrial fixtures, this screw delivers long-term reliability and compliance with ASME B18.3 specifications, supporting efficient B2B procurement for technical projects.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 standards, with precise dimensions including a Class 3A thread fit for superior engagement and a shoulder diameter tolerance of -0.001" to 0.001". Thread specifications follow UNC coarse threading (1/2"-13) with a 3/4" length, ensuring compatibility with common industrial components. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for environmental and health standards in global supply chains.