S-91306A711 4-40 x 3/16" ASTM F835 Steel Button Head Hex-Drive Screws
Steel 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 zinc-plated alloy steel construction for extended service life in harsh industrial environments
- Exceptional mechanical strength with 120,000 PSI tensile strength and Rockwell C39 hardness for reliable performance under high-stress applications
- Precision thread engagement with Class 3A fit and UNC coarse threading ensuring secure fastening and vibration resistance
- Efficient installation through 1/16" hex drive design providing superior torque transmission and reduced tool slippage
- Versatile rounded button head profile offering a low-profile, aesthetically pleasing finish while minimizing snagging hazards
- Full threading along the 3/16" length enables maximum grip depth and uniform stress distribution across fastened components
- Comprehensive regulatory compliance meeting ASME B18.3, ASTM F835, RoHS 3, and REACH standards for global industrial acceptance
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these 4-40 UNC rounded head screws deliver critical performance advantages in machinery assembly, electronic enclosures, and precision equipment. The zinc-plated alloy steel construction provides essential corrosion protection while maintaining high tensile strength for structural integrity. The coarse thread spacing and Class 3A thread fit ensure rapid installation and reliable clamping force in various materials, reducing assembly time and preventing loosening under vibration. The button head style with hex drive combines aesthetic appeal with practical installation efficiency, making these fully threaded screws ideal for applications where both appearance and performance matter in right-hand thread configurations.
Specification Summary & Compliance
Manufactured to precise inch system dimensions with 3/16" length and Class 3A thread fit tolerance. Thread specifications conform to UNC coarse thread standards with 4-40 thread size. Compliant with ASME B18.3 and ASTM F835 manufacturing specifications. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards for hazardous substance restrictions.
