S-92949A886 1/2"-20 x 3" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws
Stainless Steel Button Head Hex-Drive 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
- High-strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for reliable, heavy-duty fastening
- Precise thread engagement with Class 3A fit and UNF fine thread spacing, ensuring vibration resistance and secure installations
- Easy installation and removal thanks to the 5/16" hex drive and rounded button head design
- Full threading along the 3" length provides maximum grip and uniform stress distribution
- Compliance with major industry standards including ASME B18.3 and ASTM F879, guaranteeing consistent quality
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements
Professional Applications & Engineering Value
These 18-8 stainless steel rounded head screws are engineered to address critical challenges in demanding applications where corrosion, vibration, and high tensile loads are concerns. The passivated finish enhances the natural corrosion resistance of stainless steel, making these fully threaded screws suitable for outdoor, marine, or chemical-exposed settings. The UNF fine thread with Class 3A fit ensures tight tolerances, reducing the risk of loosening under dynamic loads. Commonly used in machinery assembly, structural frameworks, and precision equipment, these hex drive screws offer quick installation with standard tools, improving efficiency in maintenance and production lines while maintaining high-performance integrity.
Specification Summary & Compliance
This product features a 1/2"-20 UNF fine thread with Class 3A thread fit for precise dimensional accuracy. It complies with ASME B18.3 and ASTM F879 specifications, ensuring consistent manufacturing quality. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety standards for hazardous substances.
