S-91266A587 5/16"-18 x 1 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
- Secure vibration-resistant locking with nylon patch thread locker that maintains integrity across a wide temperature range from -65° to 250°F
- Exceptional tensile strength of 130,000 psi ensures reliable performance in high-stress industrial applications
- Precise Class 3A thread fit provides superior engagement and reduces the risk of cross-threading during installation
- Corrosion-resistant black-oxide finish on alloy steel extends service life in demanding environments
- Hex drive design allows for high-torque installation and removal with standard tools
- Fully threaded construction ensures maximum grip length and holding power throughout the fastener
- Standard 82° countersink angle enables flush mounting for clean, professional installations
Professional Applications & Engineering Value
These 5/16"-18 UNC flat head screws with hex drive are engineered to solve critical fastening challenges in industrial machinery, automotive assemblies, and heavy equipment. The black-oxide alloy steel construction combined with Class 3A thread fit ensures precise alignment and eliminates play in vibration-prone applications. The integrated nylon patch thread locker provides permanent resistance to loosening under dynamic loads, while the coarse UNC threading enables quick installation and superior holding power in various materials. These fully threaded screws with 130,000 psi tensile strength deliver reliable performance where structural integrity is paramount, making them ideal for critical joints in manufacturing equipment, transportation systems, and structural frameworks.
Specification Summary & Compliance
This flat head hex drive screw features precise Class 3A thread fit with 5/16"-18 UNC coarse threading and right-hand thread direction. Manufacturing complies with ASTM F835 specifications for quality assurance. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety standards for industrial components.
