S-90298A829 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 18-8 Stainless Steel and a passivated finish, ensuring long-term reliability in harsh industrial environments.
• Exceptional dimensional stability with tight shoulder tolerances (±0.001" diameter, ±0.005" length) for precise alignment and reduced assembly vibration.
• High-strength performance with a Rockwell B55 hardness, providing excellent durability and resistance to wear under heavy loads.
• Secure and efficient installation facilitated by a knurled socket head with a 5/16" hex drive, preventing tool slippage and speeding up assembly.
• Reliable thread engagement with a Class 3A UNC coarse thread, ensuring a secure, vibration-resistant fit for demanding applications.
• Broad compliance and safety meeting ASME B18.3 specifications, RoHS 3, and REACH standards, making it suitable for regulated and international markets.
• Versatile shoulder design with a 2 1/4" shoulder length, ideal for acting as a pivot, axle, or spacer in machinery and assemblies.

Professional Applications & Engineering Value

This 18-8 Stainless Steel shoulder screw is engineered to address critical challenges in industrial settings, such as misalignment, corrosion, and mechanical failure. The passivated finish significantly enhances its resistance to rust and chemical exposure, making it ideal for use in automotive, packaging machinery, and conveyor systems where environmental factors are a concern. The knurled socket head with a 5/16" hex drive ensures secure tool engagement, reducing the risk of stripping and improving installation efficiency. Its UNC coarse thread and Class 3A thread fit provide robust, vibration-resistant connections, essential for high-stress applications. The precisely machined shoulder serves as a reliable bearing surface or pivot point, minimizing wear on connected components and extending equipment lifespan, thereby reducing maintenance downtime and operational costs.

Specification Summary & Compliance

This shoulder screw features a 1/2"-13 UNC coarse thread with a Class 3A thread fit for high precision. Dimensional accuracy is maintained with shoulder diameter tolerance of -0.001" to 0.001" and shoulder length tolerance of -0.005" to 0.005". It is manufactured in compliance with ASME B18.3 standards and is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to international safety and environmental regulations.