S-91255A020 3-48 x 1/2" 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, extending 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 consistent, secure fastening with minimal backlash
- Hex drive compatibility enables efficient installation with standard tools, reducing assembly time
- Fully threaded design maximizes grip length and load distribution across the entire fastener
- Rounded button head profile offers a low-profile, aesthetically pleasing finish while maintaining structural integrity
- Rockwell C39 hardness maintains thread form and drive integrity through repeated use
Professional Applications & Engineering Value
These 3-48 UNC Class 3A rounded button head screws deliver critical performance advantages in precision assembly applications where vibration resistance and consistent clamping force are paramount. The black-oxide alloy steel construction provides superior protection against environmental factors while maintaining the 120,000 PSI tensile strength required for heavy-duty fastening. The combination of coarse UNC threading and Class 3A fit ensures rapid installation with exceptional holding power, making them ideal for machinery, electronic enclosures, and automotive components where reliability cannot be compromised. The hex drive configuration prevents cam-out during high-torque applications, while the fully threaded design maximizes engagement in both thick and thin materials.
Specification Summary & Compliance
Manufactured to exacting inch system dimensions with Class 3A thread fit tolerances per UNC standards. Compliant with ASME B18.3 and ASTM F835 specifications for dimensional accuracy and mechanical properties. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards. Features right-hand coarse threading with 0.099" thread diameter and 1/2" length for consistent performance across industrial applications.
