S-91266A589 5/16"-18 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
- Vibration-resistant performance with nylon patch thread locker that maintains secure fastening from -65° to 250°F
- Exceptional durability from black-oxide alloy steel construction offering 130,000 psi tensile strength and Rockwell C39 hardness
- Precise thread engagement with Class 3A thread fit ensuring reliable connections in demanding applications
- Optimized drive efficiency through 3/16" hex drive design providing superior torque transmission
- Enhanced flush mounting with standard flat head profile and 82° countersink angle for seamless surface integration
- Reliable coarse threading using 5/16"-18 UNC threads for quick installation and superior holding power
- Industry compliance assurance meeting ASTM F835 specifications and environmental regulations including RoHS 3 and REACH
Professional Applications & Engineering Value
These black-oxide alloy steel flat head screws deliver critical vibration resistance in industrial machinery, automotive assemblies, and heavy equipment where secure fastening under thermal stress is paramount. The nylon patch thread locker creates permanent locking action without compromising the Class 3A thread fit, eliminating the need for secondary locking components. Engineered with partial threading and coarse UNC threads, these hex drive screws provide superior clamping force in softer materials while the 82° countersink ensures flush mounting in precision applications. The combination of 130,000 psi tensile strength and temperature-resistant locking makes these flat head screws ideal for vibration-prone environments requiring maintenance-free performance.
Specification Summary & Compliance
Manufactured to ASTM F835 specifications with Class 3A thread fit precision and 5/16"-18 UNC coarse threading. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. Features include 2" length with minimum 1" thread length, 0.656" head diameter, and 3/16" hex drive configuration. The black-oxide finish on alloy steel provides corrosion resistance while maintaining the 130,000 psi tensile strength and Rockwell C39 hardness properties.
