S-91253A539 1/4"-20 x 5/8" ASTM F835 Alloy Steel Hex Drive Flat Head Screws
Alloy 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
- Exceptional Tensile Strength: Withstands up to 130,000 psi, ensuring reliable performance under high-stress conditions.
- Superior Corrosion Resistance: Black-oxide finish on alloy steel provides enhanced durability in harsh industrial environments.
- Precise Thread Fit: UNC Class 3A thread ensures tight, secure fastening with minimal risk of loosening.
- Efficient Installation: Hex drive (5/32") allows for quick, tool-compatible assembly with reduced slippage.
- Flush Mounting Capability: Standard 82° countersink angle enables a smooth, unobtrusive surface finish.
- Full Thread Engagement: Fully threaded design maximizes grip strength across the entire 5/8" length.
- Consistent Hardness: Rockwell C39 rating guarantees uniform material strength and long-term wear resistance.
Professional Applications & Engineering Value
Engineered for demanding industrial applications, this black-oxide alloy steel flat head screw combines high tensile strength (130,000 psi) with a corrosion-resistant finish to address common challenges like vibration-induced loosening and environmental degradation. The UNC coarse thread spacing and Class 3A fit provide superior holding power in metals and composites, while the hex drive ensures efficient installation in confined spaces. Ideal for machinery assembly, automotive components, and structural frameworks, it delivers reliable performance where precision and durability are critical. The 82° countersink angle facilitates seamless integration into angled surfaces, minimizing protrusion and enhancing safety.
Specification Summary & Compliance
This product adheres to ASME B18.3 and ASTM F835 manufacturing standards, with precise UNC thread Class 3A tolerances for consistent fit. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity. The screw features a coarse thread spacing and right-hand threading, optimized for high-strength applications in industrial settings.
