S-92210A553 1/4"-20 x 2 3/4" ASME B18.3, ASTM F879 Stainless Steel Hex Drive Flat Head Screws
Stainless Steel Hex Drive Flat Head 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 construction and passivated finish, ideal for harsh industrial environments.
- Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable, heavy-duty fastening.
- Precise, secure thread engagement with Class 3A UNC coarse threads ensuring vibration resistance and easy assembly.
- Flush, low-profile installation thanks to the standard flat head and 82° countersink angle, minimizing protrusion.
- High-torque driving capability provided by the 5/32" hex drive, reducing cam-out and tool wear.
- Full-length threading for maximum grip and adjustability across the entire 2-3/4" length.
- Compliance with major standards including ASME B18.3, RoHS 3, and REACH, ensuring quality and environmental safety.
Professional Applications & Engineering Value
This 1/4"-20 UNC flat head screw is engineered to address critical challenges in industrial assembly, such as vibration loosening and corrosive degradation. The 18-8 stainless steel material, combined with a passivated finish, provides excellent resistance to rust and chemicals, making it suitable for machinery, marine equipment, and outdoor structures. The Class 3A thread fit and coarse threading ensure quick installation and reliable holding power in materials like metal and hardwood. Its flat head design with an 82° countersink allows for a smooth, flush surface, preventing snagging and improving safety in high-traffic areas. Ideal for heavy-duty applications requiring long-term durability and compliance with stringent industry standards.
Specification Summary & Compliance
This fastener adheres to inch system measurements with a 1/4"-20 UNC thread size and Class 3A precision thread fit for tight tolerances. It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring it is free from hazardous substances and safe for various industrial uses.
