S-91253A537 1/4"-20 x 1/2" 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 of 130,000 psi ensures reliable performance in high-stress industrial applications
- Superior corrosion resistance through black-oxide coating extends service life in demanding environments
- Precision Class 3A thread fit provides secure fastening with minimal vibration loosening
- Hex drive design allows for high-torque installation and easy removal with standard tools
- Fully threaded construction offers maximum grip length and holding power
- Heavy-duty alloy steel material with Rockwell C39 hardness maintains structural integrity under load
- 82° countersink angle ensures flush mounting for clean, professional finishes
Professional Applications & Engineering Value
These black-oxide alloy steel flat head screws with 1/4"-20 UNC coarse threading deliver exceptional engineering value across industrial applications. The combination of 130,000 psi tensile strength and Rockwell C39 hardness provides reliable performance in machinery assembly, automotive components, and heavy equipment where vibration resistance is critical. The hex drive configuration enables high-torque installation without cam-out issues, while the black-oxide surface treatment offers superior corrosion protection in challenging environments. These fully threaded fasteners with Class 3A precision ensure consistent clamping force and eliminate the need for additional locking mechanisms, reducing assembly time and maintenance requirements in manufacturing and construction applications.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit and UNC coarse thread spacing for superior engagement. Compliant with ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and performance reliability. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) standards for safe industrial use. Features right-hand threading with standard 82° countersink angle for universal compatibility across applications requiring flush-mounted fasteners.
