S-91773A558 1/4"-28 x 5/8" ASME B18.6.3 Stainless Steel Round Head Phillips Screws
Stainless Steel Round Head Phillips 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 corrosion resistance from 18-8 stainless steel and passivated finish, ideal for harsh environments and long-term reliability.
- Superior mechanical strength with 100,000 psi tensile strength and Rockwell B100 hardness, ensuring high load-bearing capacity and durability.
- Precise and secure fastening with Class 2A thread fit and UNF fine threads, providing excellent vibration resistance and reduced loosening.
- Efficient installation and removal using the standard No. 3 Phillips drive, allowing for quick assembly with common tools.
- Full-length threading for maximum grip and engagement along the entire 5/8" length, enhancing joint integrity.
- Rounded head design offers a smooth, low-profile finish, minimizing snagging and improving safety in assembled applications.
- Compliance with major standards including ASME B18.6.3, RoHS 3, and REACH, ensuring product quality and environmental safety.
Professional Applications & Engineering Value
This 18-8 stainless steel rounded head screw is engineered to solve critical challenges in industrial and engineering settings, such as corrosion-induced failure and vibration loosening. The combination of a passivated finish and stainless steel material provides outstanding resistance to moisture, chemicals, and oxidation, making it ideal for applications in marine, chemical processing, and outdoor equipment. The UNF fine thread and Class 2A fit ensure tight, reliable connections that withstand dynamic loads and thermal cycling, reducing maintenance needs. Commonly used in machinery assembly, electronic enclosures, and automotive components, these Phillips drive screws deliver consistent performance, streamline installation, and extend service life in demanding environments.
Specification Summary & Compliance
This screw features precise 1/4"-28 UNF fine threads with a Class 2A thread fit for accurate dimensional tolerance. It is manufactured in accordance with ASME B18.6.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards.
