S-91266A585 5/16"-18 x 1 1/4" 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 locking with permanent nylon patch that maintains secure fastening in high-stress environments
- Exceptional tensile strength of 130,000 psi ensures reliable performance under heavy loads and mechanical stress
- Corrosion-resistant black-oxide coating on alloy steel provides durable protection in demanding industrial conditions
- Precision Class 3A thread fit delivers superior engagement and consistent clamping force in critical assemblies
- Wide temperature tolerance from -65° to 250°F maintains locking integrity across extreme operating conditions
- Standard 82° countersink angle ensures flush mounting and clean aesthetic finish in precision applications
- Hex drive design allows for high-torque installation without cam-out, speeding assembly processes
Professional Applications & Engineering Value
Engineered for demanding industrial applications where vibration resistance and reliability are critical, these 5/16"-18 UNC flat head screws with nylon patch locking technology solve common fastening failures in machinery, automotive, and heavy equipment. The black-oxide alloy steel construction combined with Class 3A thread fit ensures precise engagement that withstands dynamic loads and thermal cycling. The coarse UNC threading provides excellent holding power in softer materials while the permanent thread locker eliminates the need for secondary locking components, reducing assembly time and maintenance costs in vibration-prone environments.
Specification Summary & Compliance
These fully threaded fasteners feature Class 3A thread fit precision and UNC coarse threading for optimal performance. Manufactured to meet ASTM F835 specifications with complete compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. The right-hand thread direction and standardized 82° countersink angle ensure compatibility with industry-standard installations and tooling requirements.
