S-91266A625 3/8"-16 x 1 1/8" 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
- Permanent vibration resistance with nylon patch thread locker that maintains secure fastening in dynamic environments
- Exceptional tensile strength of 130,000 psi ensures reliable performance under heavy loads and stress conditions
- Superior corrosion protection through black-oxide coating on alloy steel for extended service life in harsh industrial settings
- Precise Class 3A thread fit provides consistent engagement and reduces the risk of cross-threading during installation
- Wide temperature tolerance from -65° to 250°F allows reliable operation in extreme thermal environments
- Optimized drive efficiency with 7/32" hex drive for secure tool engagement and reduced cam-out during tightening
- Full threading design enables maximum grip length and uniform load distribution across the entire fastener
Professional Applications & Engineering Value
These 3/8"-16 UNC flat head screws with nylon patch locking technology address critical vibration-induced loosening in industrial machinery, automotive assemblies, and heavy equipment. The black-oxide alloy steel construction provides superior corrosion resistance while maintaining the 130,000 psi tensile strength required for structural applications. The Class 3A thread fit ensures precise mating with tapped holes, reducing installation time and preventing thread damage. The fully threaded design offers maximum engagement in thin materials, while the 82° countersink angle creates a flush finish for aerodynamic and safety-critical surfaces. These industrial fasteners maintain their locking capability across a broad temperature range from -65° to 250°F, making them suitable for outdoor equipment and thermal cycling environments.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread fit standards with UNC coarse threading (3/8"-16) and fully threaded design. Complies with ASTM F835 specifications for mechanical properties and performance. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards, ensuring safe use in regulated industries. Features Rockwell C39 hardness and maintains dimensional accuracy per inch system requirements.
