S-91255A076 2-56 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
- Exceptional corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
- Superior thread engagement with Class 3A fit ensures reliable fastening and vibration resistance in precision assemblies
- High-strength alloy steel construction delivers 120,000 psi tensile strength for critical load-bearing applications
- Optimized hex drive design (0.050") provides secure tool engagement and prevents stripping during installation
- Low-profile rounded button head offers smooth surface finish while maintaining structural integrity
- Full threading capability enables maximum grip length and uniform stress distribution
- Industry-standard compliance with ASME B18.3 and ASTM F835 ensures interchangeability and quality consistency
Professional Applications & Engineering Value
Engineered for precision assemblies requiring reliable fastening under dynamic loads, these black-oxide alloy steel screws solve common industrial challenges. The Class 3A thread fit combined with UNC coarse threading provides superior resistance to vibrational loosening in machinery, electronic enclosures, and automotive components. The rounded button head design eliminates sharp edges while the hex drive system ensures maximum torque transmission without cam-out. With 120,000 psi tensile strength and Rockwell C39 hardness, these fully threaded screws maintain clamping force in high-stress applications while the corrosion-resistant coating protects against industrial atmospheres.
Specification Summary & Compliance
Manufactured to precision Class 3A thread tolerances with UNC 2-56 coarse thread spacing and right-hand orientation. Compliant with ASME B18.3 dimensional standards and ASTM F835 material specifications. Meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) requirements for hazardous substances. All components maintain full traceability to applicable industrial standards for quality assurance.
