S-92210A563 1/4"-20 x 4 1/2" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments.
• Superior holding power and reliability from a high 70,000 psi tensile strength and Rockwell B55 hardness.
• Precise and secure fastening ensured by the Class 3A thread fit and UNC coarse thread spacing, reducing the risk of cross-threading.
• Efficient installation and flush finish with a standard 82° countersink angle and flat head design, minimizing protrusion.
• High-torque driving capability provided by the 5/32" hex drive, allowing for secure tool engagement.
• Full-length threading for maximum grip and load distribution along the entire 4 1/2" length.
• Compliance with major industry standards including ASME B18.3, ensuring dimensional accuracy and performance reliability.

Professional Applications & Engineering Value

This 1/4"-20 x 4 1/2" flat head screw is engineered for demanding industrial applications where material integrity and fastener reliability are critical. Manufactured from 18-8 stainless steel with a passivated finish, it provides excellent resistance to oxidation and chemical exposure, solving common failure points in machinery, structural assemblies, and outdoor equipment. The UNC coarse thread and Class 3A fit ensure rapid assembly with high resistance to vibration loosening, while the 82° countersink and flat head profile allow for a smooth, flush surface—essential in applications where aerodynamics or safety are a concern. Its fully threaded design maximizes engagement in thick materials, providing uniform clamp load and enhanced joint stability for long-term performance.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC thread with coarse spacing and a precision Class 3A thread fit for consistent, high-accuracy assembly. It is manufactured in compliance with ASME B18.3 specifications, ensuring dimensional conformity and mechanical performance. The product is also verified as RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for use in various global markets.