S-91266A626 3/8"-16 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 nylon patch thread locker that maintains secure fastening from -65° to 250°F
- Exceptional tensile strength of 130,000 psi for reliable performance in high-stress industrial applications
- Superior corrosion protection through black-oxide coating on alloy steel construction
- Precise Class 3A thread fit ensures smooth installation and optimal engagement in mating components
- Enhanced durability with Rockwell C39 hardness rating for long service life in demanding environments
- Secure hex drive engagement with 7/32" drive size for efficient installation and removal
- Standard 82° countersink angle provides flush mounting in properly prepared surfaces
Professional Applications & Engineering Value
This black-oxide alloy steel flat head hex screw delivers critical performance advantages for industrial assembly applications where vibration resistance and structural integrity are paramount. The combination of Class 3A UNC coarse threading and nylon patch thread locking technology effectively counters loosening in high-vibration environments, from heavy machinery to transportation equipment. The fully threaded design ensures maximum engagement depth while the 82° countersink creates a flush finish for safety and aesthetics. Engineered to withstand extreme temperature fluctuations and maintain clamping force under dynamic loads, this fastener provides reliable long-term performance in automotive, manufacturing, and construction applications where failure is not an option.
Specification Summary & Compliance
This 3/8"-16 x 1-1/4" flat head hex screw features precision Class 3A thread fit with UNC coarse threading and right-hand thread direction. Manufactured to ASTM F835 specifications with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The fastener maintains dimensional accuracy throughout production, ensuring consistent performance and interchangeability in industrial applications requiring inch system measurements.
