S-91771A890 3-48 x 3/8" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws
Stainless Steel Phillips 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 passivated 18-8 stainless steel construction, ideal for harsh environments and extended service life
- Exceptional tensile strength rated at 80,000 psi, providing reliable fastening under high-stress industrial conditions
- Optimized flush installation featuring an undercut flat head and 82° countersink angle for a clean, secure fit in countersunk holes
- Easy installation and removal with Phillips No. 1 drive, reducing tool slippage and improving assembly efficiency
- Precise thread engagement with UNC coarse threading and Class 2A fit, ensuring consistent performance and vibration resistance
- Full compliance with industry standards including ASME B18.6.3, RoHS 3, and REACH, guaranteeing quality and regulatory adherence
- Enhanced durability with Rockwell B80 hardness, maintaining structural integrity through repeated use
Professional Applications & Engineering Value
These 3-48 UNC flat head screws deliver critical engineering value in demanding applications where corrosion resistance and precise fastening are paramount. The passivated 18-8 stainless steel material effectively combats oxidation and chemical exposure, making these industrial screws ideal for machinery, electronics, and outdoor equipment. The undercut flat head profile and 82° countersink angle ensure a flush, low-profile installation that minimizes protrusion and improves aerodynamic or aesthetic finishes. With fully threaded coarse UNC threads and Class 2A fit, these screws provide excellent grip in softer materials and resist loosening under vibration, addressing common assembly challenges in manufacturing and maintenance operations.
Specification Summary & Compliance
This screw meets precise dimensional standards with Class 2A thread fit and UNC coarse thread specifications, ensuring consistent interchangeability. Manufacturing and quality are governed by ASME B18.6.3, while environmental and safety compliance is confirmed through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) adherence, supporting use in regulated industries.
