S-90298A202 4-40 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 and passivated finish, ideal for harsh industrial environments.
- High-strength durability with 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-lasting performance.
- Precise thread engagement via Class 3A thread fit and UNC coarse threads, ensuring secure fastening and reduced assembly time.
- Easy installation and removal with a 5/64" hex socket drive, allowing for efficient torque application in confined spaces.
- Accurate shoulder alignment with tight diameter and length tolerances, providing stable positioning for rotating components.
- Compliance with industry standards including ASME B18.3, RoHS, and REACH, guaranteeing safety and regulatory adherence.
- Smooth head texture minimizes friction and wear, enhancing overall assembly integrity.
Professional Applications & Engineering Value
This 4-40 UNC thread shoulder screw is engineered to address common industrial challenges, such as misalignment and corrosion in machinery. Made from 18-8 stainless steel with a passivated finish, it resists rust and chemical exposure, extending service life in applications like precision instruments, automotive assemblies, and electronic enclosures. The Class 3A thread fit and coarse threading ensure quick, secure fastening, reducing the risk of loosening under vibration. Combined with a hex socket drive and standardized shoulder dimensions, it simplifies maintenance and improves operational efficiency in high-stress environments, making it a reliable choice for B2B procurement focused on durability and compliance.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, featuring a Class 3A thread fit with UNC coarse threads for precise dimensional accuracy. The shoulder diameter tolerance is -0.001" to 0.001", and length tolerance is -0.005" to 0.005", ensuring consistent performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally safe and regulated industrial use.
