S-91355A156 4-40 x 1/2" 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 coating, extending service life in demanding industrial environments
- Precise Class 3A thread fit ensures secure fastening with minimal vibration loosening in critical assemblies
- Exceptional 120,000 psi tensile strength provides reliable performance under high-stress conditions
- Wide button head profile distributes clamping force evenly while offering an attractive low-profile finish
- Hex drive design delivers maximum torque transfer and prevents stripping during installation
- Fully threaded construction allows for consistent engagement depth across various material thicknesses
- Integrated flange eliminates need for separate washers, reducing assembly time and component count
Professional Applications & Engineering Value
Engineered for precision industrial applications, these 4-40 UNC Class 3A rounded head screws solve critical fastening challenges where vibration resistance and consistent clamping force are paramount. The black-oxide alloy steel construction provides excellent corrosion protection while maintaining Rockwell C32 hardness for durability in harsh environments. The wide button head profile with integrated flange creates superior bearing surface distribution, preventing material deformation in soft substrates. Ideal for electronic enclosures, machinery guards, and automotive components, these fully threaded hex drive screws ensure reliable performance in automated assembly systems where coarse UNC threads enable rapid installation without compromising joint integrity.
Specification Summary & Compliance
Manufactured to precise UNC thread standards with Class 3A thread fit for superior dimensional accuracy and engagement. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features right-hand coarse threads with 1/2" length and 0.234" flange diameter, ensuring consistent performance across industrial applications while meeting international compliance standards for hazardous substance restrictions.
