S-90910A718 4-40 x 1/2" ASME B18.3 Stainless Steel Button Head Torx Plus Screws
Stainless Steel Button Head Torx Plus Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance with 18-8 stainless steel and passivated finish, ideal for harsh industrial environments
- Enhanced torque transfer and reduced cam-out using Torx Plus T8 drive for reliable, high-torque assembly
- High tensile strength of 60,000 psi ensures dependable performance in demanding applications
- Precise Class 2A thread fit guarantees smooth installation and secure fastening
- Fully threaded design provides maximum grip and uniform load distribution along the entire length
- Rounded button head profile offers a low-profile, aesthetically pleasing finish while minimizing snagging
- Compliance with ASME B18.3, RoHS 3, and REACH ensures quality, safety, and environmental standards are met
Professional Applications & Engineering Value
These 4-40 UNC rounded head screws are engineered to address critical challenges in precision assembly and industrial maintenance. The combination of 18-8 stainless steel and a passivated finish provides excellent resistance to corrosion and oxidation, making them suitable for electronics, machinery, and outdoor equipment where environmental factors are a concern. The Torx Plus T8 drive minimizes tool slippage and fastener damage, allowing for higher torque application and reducing assembly errors. With a coarse UNC thread and fully threaded design, these screws ensure quick installation and strong holding power in materials like metal, plastic, and composites. Their rounded head style not only enhances appearance but also prevents injury and interference in compact spaces, supporting efficient B2B procurement for OEMs and MRO operations.
Specification Summary & Compliance
This screw adheres to Class 2A thread fit per UNC standards, ensuring dimensional accuracy and interchangeability. It meets ASME B18.3 specifications for dimensional and mechanical requirements, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of hazardous substances and safe for various industrial applications.
