S-92210A331 1/4"-28 x 1/2" ASME B18.3 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 and passivated finish, ideal for harsh industrial environments.
- Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-term performance.
- Precise, secure fastening with Class 3A thread fit and UNF fine thread spacing, minimizing the risk of loosening under vibration.
- Easy installation and removal using a standard 5/32" hex drive, reducing assembly time and tool wear.
- Flush, low-profile seating with an 82° countersink angle and standard flat head, providing a smooth surface finish.
- Full thread engagement along the entire 1/2" length for maximum grip and load distribution in materials.
- Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.
Professional Applications & Engineering Value
This 1/4"-28 UNF flat head screw is engineered to address common industrial challenges such as vibration-induced loosening and corrosion in demanding applications. Constructed from 18-8 stainless steel with a passivated finish, it provides excellent resistance to oxidation and chemical exposure, making it suitable for machinery, automotive assemblies, and outdoor equipment. The Class 3A thread fit and fine thread spacing ensure tight tolerances and superior holding power, while the hex drive allows for high-torque installation without slippage. Its fully threaded design and 82° countersink angle enable secure, flush mounting in pre-drilled holes, enhancing structural integrity and aesthetic appeal in precision engineering projects.
Specification Summary & Compliance
This screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for high precision in UNF fine threads. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances. Dimensions include a 1/4"-28 thread size, 1/2" length, and 0.531" head diameter, manufactured to exact tolerances for consistent performance in industrial fastening applications.
