S-91771A581 5/16"-18 x 3/4" 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 industrial environments.
- Exceptional tensile strength of 80,000 psi ensures reliable performance under high-stress conditions.
- Precision UNC coarse threading with Class 2A fit provides quick assembly and secure fastening.
- Optimized 82° countersink angle allows for a flush, professional finish in countersunk applications.
- Full threading along the entire 3/4" length maximizes grip and load distribution.
- Consistent hardness (Rockwell B80) guarantees durability and resistance to wear over time.
- No. 4 Phillips drive offers common tool compatibility and efficient installation.
Professional Applications & Engineering Value
These Flat Head Phillips Screws are engineered to address critical challenges in demanding industrial settings. The passivated 18-8 stainless steel provides excellent resistance to corrosion and oxidation, making them suitable for outdoor machinery, marine equipment, and chemical processing applications where environmental factors are a concern. The UNC coarse thread design ensures rapid installation and reduces the risk of cross-threading, while the Class 2A thread fit maintains consistent tolerances for reliable performance in assemblies requiring repeated disassembly. The 82° countersink angle and flat head profile allow for a seamless, flush mount, minimizing protrusion and enhancing safety in high-traffic areas. Ideal for heavy-duty frameworks, automotive components, and structural fixtures, these screws deliver long-term reliability and compliance with industry standards.
Specification Summary & Compliance
This product adheres to ASME B18.6.3 specifications, ensuring dimensional accuracy and performance reliability. The thread fit is Class 2A, providing standard tolerance for general use, with UNC coarse threading (5/16"-18) and a length of 3/4". It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances and supporting environmental safety in industrial applications.
