S-91255A084 2-64 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 thread precision with Class 3A fit ensures reliable, vibration-resistant fastening in critical applications
- High tensile strength (120,000 psi) provides secure, long-lasting connections under substantial mechanical stress
- Optimized hex drive design (0.050") delivers maximum torque transfer and reduces tool slippage during installation
- Fine UNF threading (2-64) offers superior holding power and precise adjustment capabilities
- Fully threaded construction ensures consistent engagement along the entire 1/2" length for uniform load distribution
- Rounded button head profile combines sleek aesthetics with practical, low-profile installation
Professional Applications & Engineering Value
These black-oxide alloy steel screws with 2-64 UNF fine threading solve critical engineering challenges in precision assemblies where vibration resistance and dimensional stability are paramount. The Class 3A thread fit eliminates play in sensitive equipment, while the Rockwell C39 hardness maintains thread integrity through repeated disassembly cycles. The hex drive configuration prevents cam-out in high-torque applications, making these rounded head screws ideal for aerospace components, medical devices, and precision instrumentation where reliability cannot be compromised. The combination of fully threaded design and high tensile strength ensures uniform stress distribution across the entire fastener length.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread fit tolerances with UNF fine threading (2-64) and compliant with ASME B18.3 and ASTM F835 specifications. Meets environmental standards including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) requirements. Features fully threaded construction with 1/2" length and right-hand thread direction for standardized industrial applications.
