S-90969A220 1/4"-20 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
- Exceptional durability with 140,000 psi tensile strength and Rockwell C30 hardness, ensuring long-term reliability in high-stress applications.
- Superior corrosion resistance from the black oxide finish, extending service life in harsh or humid industrial environments.
- Precise alignment and reduced wear thanks to the 5/16" shoulder diameter with tight tolerance, providing stable bearing surfaces for rotating components.
- Quick and secure fastening with UNC coarse threads and Class 3A fit, minimizing cross-threading and enabling efficient assembly.
- Low-profile, space-saving design featuring an ultra-low socket head and knurled texture for easy installation in confined areas.
- Environmental compliance assurance by meeting RoHS 3 and REACH standards, supporting sustainable manufacturing practices.
- Versatile drive compatibility with a 5/32" hex drive, allowing use with standard tools for consistent torque application.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical challenges in precision machinery, such as misalignment and component wear. The black oxide finish enhances corrosion resistance, making it ideal for automotive, aerospace, and industrial equipment exposed to moisture or chemicals. Its UNC coarse thread and Class 3A thread fit ensure secure fastening with minimal risk of stripping, while the knurled, ultra-low socket head allows for easy access in tight spaces. The precisely machined shoulder provides a reliable pivot or spacer in assemblies, reducing vibration and improving operational lifespan. By combining high tensile strength with compliance to RoHS and REACH, it delivers both performance and regulatory safety for demanding B2B procurement needs.
Specification Summary & Compliance
This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for precise tolerance, ensuring consistent performance. Dimensions include a 1/4"-20 thread size, 7/16" thread length, and 5/16" shoulder diameter with tight tolerances (e.g., -0.004" to -0.002"). It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting environmental and safety regulations in industrial applications.
