S-92210A556 1/4"-20 x 3 1/4" 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 and passivated finish for long-lasting performance in harsh environments.
- High-strength reliability with 70,000 psi tensile strength and Rockwell B55 hardness to withstand heavy-duty loads.
- Precise thread engagement with Class 3A fit and 1/4"-20 UNC coarse thread for secure fastening and vibration resistance.
- Efficient installation with a 5/32" hex drive and standard 82° countersink angle for a flush, professional finish.
- Full threading along the entire 3-1/4" length ensures maximum grip and uniform stress distribution.
- Compliance assurance with ASME B18.3 and ASTM F879 standards for consistent quality and interchangeability.
- Environmental and safety compliance with RoHS 3 and REACH regulations for use in regulated industries.
Professional Applications & Engineering Value
These 1/4"-20 UNC flat head screws are engineered to address critical challenges in industrial assembly, such as material degradation and joint failure. The 18-8 stainless steel composition, enhanced by a passivated finish, provides exceptional resistance to corrosion and oxidation, making them ideal for applications in marine, chemical processing, and outdoor equipment. The Class 3A thread fit and coarse UNC threading ensure rapid installation and reliable performance in high-vibration environments, reducing maintenance needs. With a fully threaded design and 82° countersink, they offer seamless integration into machinery, enclosures, and structural frameworks, delivering robust, long-term fastening solutions that meet rigorous industrial fastener standards.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC thread with Class 3A fit for precise dimensional accuracy and a standard 82° countersink angle. It is manufactured in compliance with ASME B18.3 and ASTM F879 specifications, ensuring consistent performance. The product is also confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for industrial use.
