S-91255A548 1/4"-20 x 1 3/4" 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 demanding industrial environments
- Exceptional mechanical strength with 120,000 psi tensile strength and Rockwell C39 hardness for heavy-duty applications
- Precise thread engagement with Class 3A fit and UNC coarse threading, ensuring reliable fastening and vibration resistance
- Optimized drive efficiency with 5/32" hex drive design, providing secure tool engagement and reduced cam-out risk
- Full-threaded construction for maximum grip length and uniform stress distribution across the entire fastener
- Regulatory compliance assurance meeting ASME B18.3, ASTM F835, RoHS 3, and REACH standards for global industrial use
- Streamlined rounded head profile with button-style design for reduced snagging and improved aesthetic integration
Professional Applications & Engineering Value
These black-oxide alloy steel rounded head screws deliver critical performance advantages in industrial assembly where corrosion resistance and high tensile strength are paramount. The combination of Class 3A thread fit with UNC coarse threading provides superior vibration resistance in machinery, automotive, and heavy equipment applications. The fully threaded design ensures maximum engagement in thick materials, while the 5/32" hex drive offers reliable torque transmission without stripping. Engineered to withstand harsh environments, these ASME B18.3 compliant fasteners solve common challenges of fastener failure, corrosion-induced seizing, and maintenance downtime.
Specification Summary & Compliance
This 1/4"-20 UNC threaded fastener features Class 3A thread fit precision and complies with ASME B18.3 dimensional standards and ASTM F835 mechanical properties. The manufacturing process ensures consistent 120,000 psi tensile strength and Rockwell C39 hardness throughout production. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, confirming restricted substance adherence for global industrial distribution and use.
