S-91266A593 5/16"-24 x 1" ASTM F835 Alloy Steel Thread-Locking Hex Drive Flat Head Screws
Alloy Steel Thread-Locking 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
- Permanent vibration resistance with nylon patch locking that maintains secure fastening in high-stress environments
- Superior corrosion protection from black-oxide coating on alloy steel, extending service life in demanding conditions
- Exceptional load-bearing capacity with 130,000 psi tensile strength and Rockwell C39 hardness for heavy-duty applications
- Precision thread engagement with Class 3A fit and UNF fine threads ensuring reliable, consistent performance
- Wide temperature compatibility from -65° to 250°F, suitable for diverse industrial environments
- Optimized flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
- Enhanced installation efficiency through hex drive design providing secure tool engagement and torque transmission
Professional Applications & Engineering Value
These nylon patch locking flat head screws deliver critical vibration resistance in machinery, automotive, and aerospace assemblies where loosening under dynamic loads poses significant failure risks. The black-oxide alloy steel construction provides essential corrosion protection while maintaining the 130,000 psi tensile strength required for structural applications. The Class 3A UNF fine threads ensure precise fit in tapped holes, reducing the potential for cross-threading and thread damage during installation. With full threading along the 1" length, these screws maximize engagement depth in both thin and thick materials. The combination of temperature-resistant nylon patch locking and 82° countersink profile makes these fasteners ideal for precision equipment requiring flush surfaces and reliable long-term performance despite thermal cycling.
Specification Summary & Compliance
Manufactured to ASTM F835 specifications with Class 3A thread fit precision and UNF 5/16"-24 fine threading. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features include right-hand thread direction, fully threaded design, and meets specified dimensional tolerances for head diameter (0.656"), head height (0.198"), and drive size (3/16" hex).
