S-91266A584 5/16"-18 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
- Superior corrosion resistance with black-oxide coating on alloy steel for extended service life in demanding industrial environments
- Exceptional vibration resistance through nylon patch thread locking that maintains secure fastening from -65° to 250°F
- Precise installation and removal with hex drive design providing superior torque transmission and reduced tool slippage
- Reliable thread engagement with Class 3A thread fit ensuring consistent performance in high-vibration applications
- Maximum load distribution through 82° countersink angle that creates flush mounting in metal assemblies
- High-strength performance with 130,000 psi tensile strength and Rockwell C39 hardness for heavy-duty applications
- Full thread coverage along the entire 1-1/8" length for versatile positioning and maximum grip length
Professional Applications & Engineering Value
These black-oxide alloy steel flat head screws with nylon patch locking technology deliver critical vibration resistance in industrial machinery, automotive assemblies, and heavy equipment where constant motion threatens fastener integrity. The UNC coarse threading combined with Class 3A thread fit ensures rapid installation and reliable performance in high-stress applications, while the 82° countersink angle provides flush mounting that eliminates protrusions in precision equipment. Engineered with hex drive compatibility for secure tool engagement, these fully threaded screws maintain their locking capability across extreme temperature ranges from -65° to 250°F, making them ideal for outdoor equipment, industrial automation, and transportation applications where thermal cycling is common.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread fit standards with UNC 5/16"-18 coarse threading and full compliance with ASTM F835 specifications. These flat head hex screws meet stringent regulatory requirements including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) standards, ensuring environmental responsibility while delivering consistent dimensional accuracy and mechanical performance for industrial applications.
