S-91255A117 4-40 x 1 1/4" 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 Black-Oxide finish on Alloy Steel for extended service life in harsh environments
- Exceptional mechanical strength with 120,000 psi tensile strength and Rockwell C39 hardness for high-stress applications
- Precision thread engagement with Class 3A fit ensuring reliable, vibration-resistant fastening
- Easy installation and removal with hex drive design providing superior torque transmission
- Broad compatibility with UNC coarse threading and right-hand direction for standard industrial applications
- Full-threaded design offering consistent holding power along the entire 1 1/4" length
- Regulatory compliance meeting ASME B18.3 and ASTM F835 specifications for quality assurance
Professional Applications & Engineering Value
These 4-40 UNC rounded head screws deliver critical performance advantages for industrial assembly applications where reliability is paramount. The Black-Oxide Alloy Steel construction provides excellent corrosion protection while maintaining the high tensile strength required for demanding mechanical systems. The Class 3A thread fit ensures precise engagement with mating components, reducing the risk of cross-threading and providing consistent clamping force in vibration-prone environments. The hex drive design allows for high-torque installation without cam-out issues, making them ideal for confined spaces in machinery, electronic enclosures, and precision equipment. The combination of fully threaded construction and coarse UNC threading provides rapid assembly and superior pull-out resistance across various material thicknesses.
Specification Summary & Compliance
This precision fastener features Class 3A thread fit per UNC standards with right-hand coarse threading. Manufacturing complies with ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and performance reliability. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental regulations for industrial components.
