S-91255A378 5/16"-24 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 for extended service life in demanding environments
- Precise thread engagement with Class 3A fit ensuring reliable, vibration-resistant connections
- High tensile strength of 120,000 psi provides exceptional load-bearing capacity for critical applications
- Optimized drive efficiency with 3/16" hex drive offering superior torque transmission and installation control
- Enhanced durability from Rockwell C39 hardness maintaining structural integrity under repeated stress
- Streamlined assembly with rounded button head design reducing snagging and improving aesthetic integration
- Regulatory compliance meeting ASME B18.3 and ASTM F835 standards for guaranteed performance and safety
Professional Applications & Engineering Value
These black-oxide alloy steel rounded head screws deliver exceptional performance in precision industrial applications where corrosion resistance and mechanical reliability are paramount. The Class 3A UNF fine threads provide superior clamping force distribution and vibration resistance in machinery, automotive assemblies, and electronic enclosures. The fully threaded design ensures maximum engagement depth while the hex drive configuration allows for high-torque installation without cam-out. Engineered to withstand harsh operating conditions, these high-strength fasteners prevent joint failure in critical structural applications while maintaining compliance with industry standards for quality assurance.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread tolerances with UNF 5/16"-24 fine thread specification. Complies with ASME B18.3 and ASTM F835 manufacturing standards. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features precise dimensional control with 0.313" thread diameter, 0.547" head diameter, and 1/2" length for consistent performance across industrial applications.
