S-91266A714 1/2"-13 x 1 1/4" ASTM F835 Alloy Steel Thread-Locking Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with nylon patch thread locker that maintains secure fastening from -65° to 250°F
• Exceptional tensile strength of 130,000 psi ensures reliable performance in high-stress applications
• Precise Class 3A thread fit provides superior engagement and reduces cross-threading risks
• Corrosion-resistant black-oxide coating on alloy steel extends service life in demanding environments
• Full threading design offers maximum grip length and consistent holding power
• Standard 82° countersink angle ensures flush mounting and clean aesthetic finish
• 5/16" hex drive enables high-torque installation without cam-out issues

Professional Applications & Engineering Value

Engineered for critical industrial applications where vibration resistance and structural integrity are paramount, these black-oxide alloy steel flat head screws solve common fastening challenges in machinery, heavy equipment, and structural assemblies. The combination of Class 3A UNC coarse threads with nylon patch locking technology prevents loosening under dynamic loads, while the 130,000 psi tensile strength ensures long-term reliability in high-stress environments. The fully threaded design provides maximum engagement depth, making these hex drive screws ideal for applications requiring consistent clamping force across the entire fastener length.

Specification Summary & Compliance

Manufactured to ASTM F835 specifications with Class 3A thread fit precision and UNC coarse threading (1/2"-13). Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. Features Rockwell C39 hardness and maintains dimensional accuracy per inch system requirements for reliable performance in industrial fastening applications.