S-91355A581 4-40 x 3/4" ASTM F835 Steel Flanged Button Head Hex-Drive Screws
Steel Flanged Button Head Hex-Drive 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 finish on Alloy Steel, extending service life in demanding environments
- High tensile strength of 120,000 psi ensures reliable performance under heavy loads and vibration
- Class 3A thread fit provides precise, secure fastening with reduced risk of cross-threading
- Flanged button head design distributes clamping force evenly and eliminates need for separate washers
- Fully threaded coarse UNC pattern enables faster installation and superior holding power in various materials
- 1/16" hex drive compatibility allows for efficient torque application with standard industrial tools
- Rockwell C39 hardness maintains thread integrity through repeated installation cycles
Professional Applications & Engineering Value
These 4-40 UNC coarse thread rounded head screws deliver exceptional engineering value for industrial assembly applications where vibration resistance and consistent clamping force are critical. The Black-Oxide Alloy Steel construction combined with Class 3A thread fit ensures reliable performance in electronic enclosures, machinery panels, and automotive components. The flanged button head design provides superior bearing surface while the fully threaded coarse pattern enables rapid installation in production environments. These hex drive screws are engineered to maintain their mechanical properties in demanding conditions, making them ideal for applications requiring repeated disassembly and reassembly while maintaining 120,000 psi tensile strength integrity.
Specification Summary & Compliance
Manufactured to precise Class 3A thread fit standards with UNC coarse thread profile (4-40 size) and 3/4" length. These screws meet ASTM F835 specifications for mechanical properties and are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The right-hand thread direction and fully threaded construction ensure consistent performance across industrial applications.
