S-91266A537 1/4"-20 x 1/2" 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
- Vibration-resistant secure fastening with integrated nylon patch thread locker that maintains integrity across a wide temperature range from -65° to 250°F
- Exceptional mechanical strength from alloy steel construction with 130,000 psi tensile strength and Rockwell C39 hardness for demanding applications
- Precision threading performance with Class 3A fit UNC coarse threads ensuring reliable engagement and reduced cross-threading risks
- Corrosion-resistant protection through black-oxide surface treatment that enhances durability in industrial environments
- Optimized flush installation with standard 82° countersink angle and flat head design for smooth surface finishing
- Secure torque transmission via 5/32" hex drive that prevents tool slippage during installation
- Regulatory compliance assurance meeting ASTM F835 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
This black-oxide alloy steel flat head screw delivers critical vibration resistance in machinery, automotive, and heavy equipment applications where secure fastening is paramount. The nylon patch thread locker eliminates the need for separate locking components, reducing assembly time while providing reliable performance across extreme temperature fluctuations from -65° to 250°F. Engineered with Class 3A fit UNC coarse threads, these fully threaded screws ensure maximum thread engagement and superior clamping force in industrial applications. The combination of 130,000 psi tensile strength and Rockwell C39 hardness provides exceptional resistance to shear and tensile stresses, while the 82° countersink angle creates seamless flush mounting in precision assemblies.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit and UNC coarse thread pattern (1/4"-20) ensuring precision compatibility. This flat head hex drive screw meets ASTM F835 specifications for mechanical properties and dimensional accuracy. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming adherence to international substance restriction standards for industrial components.
