S-90298A740 3/8"-16 ASME B18.3 Shoulder Screws
Shoulder Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh industrial environments.
- Precise component alignment thanks to the 1/2" shoulder diameter with tight tolerance (-0.001" to 0.001"), reducing assembly errors and improving mechanical stability.
- High-strength threading with 3/8"-16 UNC Class 3A coarse threads providing secure, vibration-resistant fastening in demanding applications.
- Enhanced torque application via the 1/4" hex drive and knurled socket head, allowing for easy installation and removal without slippage.
- Exceptional durability backed by Rockwell B55 hardness, offering consistent performance under mechanical stress and repeated use.
- Broad regulatory compliance including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental standards are met for global sourcing.
- Optimized for high-load scenarios with a 4-1/2" shoulder length that supports rotating parts and bearings, minimizing wear in assemblies.
Professional Applications & Engineering Value
This stainless steel shoulder screw is engineered to address critical alignment and load-bearing challenges in industrial and mechanical assemblies. The 18-8 stainless steel material combined with a passivated finish resists corrosion, making it ideal for environments exposed to moisture or chemicals. The UNC coarse thread and Class 3A fit ensure quick, secure fastening with high tensile strength, reducing the risk of thread stripping in high-vibration settings like machinery and automotive systems. The precise shoulder diameter and length provide stable support for rotating components such as gears and pulleys, enhancing overall assembly longevity and reducing maintenance needs.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for precise engagement and tight shoulder tolerances (diameter: -0.001" to 0.001"; length: -0.005" to 0.005"). It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity for industrial use.
