S-91255A054 1/2"-20 x 1 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, extending service life in harsh industrial environments
- Exceptional tensile strength of 120,000 psi ensures reliable performance under heavy loads and vibration
- Precise Class 3A thread fit provides tighter tolerances for secure fastening in critical applications
- 5/16" hex drive design allows for high-torque installation with standard tools, reducing assembly time
- Fine UNF thread spacing offers improved adjustment precision and better load distribution
- Fully threaded construction maximizes grip length and provides consistent holding power along the entire fastener
- Rounded button head profile combines aesthetic appeal with reduced risk of snagging in confined spaces
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these Black-Oxide Alloy Steel rounded head screws deliver exceptional performance where reliability is paramount. The Class 3A UNF fine threads provide superior engagement in precision machinery, automotive assemblies, and heavy equipment where vibration resistance is critical. The combination of Rockwell C39 hardness and 120,000 psi tensile strength ensures these fasteners maintain integrity under extreme stress conditions. The fully threaded design allows for maximum adjustability in structural applications, while the 5/16" hex drive facilitates quick installation with standard industrial tools, significantly reducing assembly time in production environments.
Specification Summary & Compliance
This high-performance fastener features 1/2"-20 UNF Class 3A threads with fine thread spacing, manufactured to precise dimensional standards. The screw complies with ASME B18.3 and ASTM F835 specifications, ensuring consistent quality and performance. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, making these screws suitable for regulated industries and international markets requiring strict chemical substance controls.
