S-91266A720 1/2"-13 x 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
- Superior vibration resistance with nylon patch locking 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 the risk of cross-threading
- Corrosion-resistant black-oxide finish on alloy steel extends service life in demanding environments
- Heavy-duty Rockwell C39 hardness offers excellent wear resistance and durability
- Standard 82° countersink angle ensures flush mounting and clean aesthetic finish
- 5/16" hex drive allows for high-torque installation with common industrial tools
Professional Applications & Engineering Value
This black-oxide alloy steel flat head screw delivers critical performance advantages for industrial applications where vibration resistance and structural integrity are paramount. The nylon patch locking mechanism effectively prevents loosening under dynamic loads, making it ideal for machinery, automotive assemblies, and heavy equipment. The Class 3A UNC coarse thread provides rapid installation while maintaining superior holding power in various materials. With full threading along the 2" length, this fastener ensures maximum engagement depth and load distribution. The combination of high tensile strength and temperature-resistant locking makes it particularly valuable for applications subject to thermal cycling and mechanical stress.
Specification Summary & Compliance
This fastener features Class 3A thread fit with UNC coarse threading (1/2"-13) and meets ASTM F835 specifications for mechanical properties. The manufacturing process ensures dimensional accuracy with standard 82° flat head profile and 5/16" hex drive compatibility. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental responsibility and material safety standards for industrial use.
