S-91255A118 4-40 x 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
- Exceptional corrosion resistance with black-oxide coating for reliable performance in harsh industrial environments
- Superior thread engagement with Class 3A fit ensuring precise, vibration-resistant connections in critical assemblies
- High-torque installation capability through hex drive design for efficient assembly and disassembly operations
- Maximum load-bearing capacity with 120,000 psi tensile strength and Rockwell C39 hardness for heavy-duty applications
- Full-length threading providing consistent fastening strength along the entire 2" screw length
- Standard-compliant reliability meeting ASME B18.3 and ASTM F835 specifications for quality assurance
- Environmental compliance with RoHS 3 and REACH regulations for safe use across global markets
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these 4-40 UNC coarse thread screws deliver exceptional performance where reliability is paramount. The black-oxide alloy steel construction provides superior corrosion resistance, extending service life in challenging environments while maintaining consistent Rockwell C39 hardness. The hex drive design enables high-torque installation without cam-out issues, significantly reducing assembly time in production lines. With Class 3A thread fit precision, these fully threaded screws ensure uniform load distribution and vibration resistance in machinery, automotive assemblies, and heavy equipment. The 2" length and rounded button head profile make them ideal for applications requiring deep penetration while maintaining a low-profile finish.
Specification Summary & Compliance
This precision fastener features 4-40 UNC coarse threads with Class 3A fit tolerance for superior thread engagement. Manufactured to exacting ASME B18.3 and ASTM F835 standards, ensuring dimensional accuracy and performance consistency. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The inch system measurement guarantees compatibility with North American industrial specifications and replacement part requirements.
