S-91255A003 4-48 x 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 for extended service life in demanding industrial environments
- Exceptional tensile strength of 120,000 psi ensures reliable performance under high-stress applications
- Precision Class 3A thread fit provides superior engagement and vibration resistance in critical assemblies
- Hex drive design offers secure tool engagement and reduced cam-out risk during installation
- Rockwell C39 hardness maintains thread integrity and prevents stripping in repeated use cycles
- Full threading enables maximum grip length and uniform load distribution across the entire fastener
- Regulatory compliance with RoHS 3 and REACH ensures environmental responsibility and global market acceptance
Professional Applications & Engineering Value
These 4-48 UNF rounded head screws deliver exceptional engineering value in precision assemblies where fine thread engagement and reliable fastening are critical. The Black-Oxide Alloy Steel construction provides superior corrosion protection while maintaining the 120,000 psi tensile strength required for high-stress applications. The hex drive configuration ensures positive tool engagement, reducing installation time and preventing damage to the fastener head. These Class 3A thread screws are particularly valuable in electronics, aerospace, and precision machinery where vibration resistance and consistent clamping force are essential. The fully threaded design allows for maximum adjustability and uniform stress distribution, making them ideal for applications requiring precise component positioning and reliable long-term performance.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread tolerances with UNF fine threading (4-48), these screws meet ASME B18.3 and ASTM F835 specifications for dimensional accuracy and performance. The 1/4" length and 0.112" thread diameter provide precise fitment in designed applications. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and unrestricted use in global markets.
