S-91255A092 3-48 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 coating on alloy steel, extending service life in demanding environments
- Exceptional holding power from 120,000 psi tensile strength and Rockwell C39 hardness for reliable, vibration-resistant connections
- Precise thread engagement with Class 3A fit and UNC coarse threads ensuring quick assembly and reduced cross-threading risks
- Optimized drive efficiency through 1/16" hex drive design providing secure tool engagement and reduced cam-out
- Low-profile rounded head with button style offering flush mounting and improved clearance in confined spaces
- Full-threaded design maximizing grip length and load distribution across the entire 1/4" fastener
- Regulatory compliance meeting ASME B18.3, ASTM F835, RoHS 3, and REACH standards for global industrial applications
Professional Applications & Engineering Value
These 3-48 UNC rounded head screws deliver critical performance advantages in precision assemblies where space constraints and vibration resistance are paramount. The black-oxide alloy steel construction provides essential corrosion protection for industrial equipment, electronic enclosures, and machinery components exposed to moderate environmental conditions. With coarse thread spacing and Class 3A thread fit, these fasteners enable rapid installation in soft materials and blind holes while maintaining consistent clamping force. The combination of 120,000 psi tensile strength and fully threaded design ensures uniform stress distribution, making them ideal for applications requiring reliable fastening under dynamic loads. The 1/16" hex drive and button head profile further enhance installation efficiency in confined assemblies common in automotive, aerospace, and precision instrumentation sectors.
Specification Summary & Compliance
Manufactured to ASME B18.3 and ASTM F835 specifications with Class 3A thread tolerance for precision fit. Features UNC coarse threads (3-48 size) with 0.099" thread diameter and 1/4" length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for safe use in restricted substance applications.
