S-91266A582 5/16"-18 x 7/8" 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
- Vibration-resistant locking with Nylon Patch thread locker maintains secure fastening in dynamic environments from -65° to 250°F
- Exceptional tensile strength of 130,000 psi ensures reliable performance under heavy loads and stress
- Enhanced corrosion protection from black-oxide coating prolongs service life in harsh industrial conditions
- Precise Class 3A thread fit provides superior engagement and reduces the risk of cross-threading during installation
- Optimized flat head design with 82° countersink angle allows for flush mounting in various applications
- Hex drive compatibility enables high-torque installation with standard tools for efficient assembly
- Full threading offers maximum grip length and flexibility in material thickness
Professional Applications & Engineering Value
These black-oxide alloy steel flat head screws are engineered to address critical challenges in industrial assembly where vibration loosening and corrosion are common failure points. The Nylon Patch thread locker creates a permanent bond that withstands extreme temperature fluctuations from -65° to 250°F, making these UNC coarse thread screws ideal for machinery, automotive components, and heavy equipment subjected to constant motion. The combination of Rockwell C39 hardness and 130,000 psi tensile strength ensures these hex drive screws maintain structural integrity under demanding conditions, while the flat head profile with 82° countersink provides a clean, flush finish that meets aesthetic and safety requirements in visible applications.
Specification Summary & Compliance
This 5/16"-18 UNC flat head screw features Class 3A thread fit for precision engagement and is fully threaded along its 7/8" length. Manufactured to ASTM F835 specifications with compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring both performance reliability and regulatory adherence for global industrial applications.
