S-92210A548 1/4"-20 x 1 3/4" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments.
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for demanding industrial applications.
• Precise Class 3A thread fit for secure, vibration-resistant assemblies and reduced risk of loosening.
• Efficient installation with a 5/32" hex drive and standard 82° countersink angle, enabling flush mounting and quick fastening.
• Full threading along the 1 3/4" length provides maximum grip and load distribution in various material thicknesses.
• Compliance with ASME B18.3, RoHS 3, and REACH ensures adherence to industry standards and environmental safety regulations.
• Coarse UNC thread spacing facilitates faster assembly and reduces cross-threading risks in high-volume operations.

Professional Applications & Engineering Value

Engineered for industrial applications, these 1/4-20 UNC flat head screws address critical needs in machinery, automotive, and construction sectors. The 18-8 stainless steel material, combined with a passivated finish, resists oxidation and chemical exposure, extending service life in corrosive settings. The Class 3A thread fit and coarse UNC threading ensure tight, reliable connections that withstand vibrations and dynamic loads. With a flat head design and 82° countersink angle, they provide a smooth, flush surface ideal for aesthetic and safety-sensitive assemblies, reducing snagging and improving airflow in enclosed systems. These fully threaded screws offer versatile fastening solutions for heavy-duty fasteners requiring high tensile strength and durability.

Specification Summary & Compliance

This 1/4-20 UNC flat head screw features precise dimensions, including a head diameter of 0.531", length of 1 3/4", and Class 3A thread fit per UNC standards for optimal tolerance. It complies with ASME B18.3 specifications for consistency and reliability. Environmental and safety adherence is confirmed through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring no hazardous substances. The fully threaded design and 82° countersink angle meet industrial requirements for secure, efficient fastening in various applications.