S-91253A480 1/4"-20 x 6" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating on alloy steel, extending service life in demanding industrial environments
• Exceptional tensile strength rated at 130,000 psi ensures reliable performance under high-stress applications
• Precise Class 3A thread fit provides consistent engagement and vibration resistance in assembled components
• Hex drive design delivers maximum torque transmission and prevents tool slippage during installation
• Partially threaded shank allows for controlled clamping force and secure fastening in structural applications
• 82° countersink angle enables flush mounting for cleaner aesthetics and reduced snag hazards
• Compliance with major industrial standards including ASME B18.3 and ASTM F835 ensures interoperability and quality consistency

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these black-oxide alloy steel flat head screws solve critical fastening challenges where corrosion resistance and high tensile strength are paramount. The UNC coarse threading combined with Class 3A thread fit provides superior vibration resistance in machinery, construction, and transportation equipment. The hex drive configuration ensures efficient installation in confined spaces while the partially threaded design allows precise clamping control. These flat head screws are ideal for applications requiring flush surface mounting in metal frameworks, industrial enclosures, and structural assemblies where reliability cannot be compromised.

Specification Summary & Compliance

This fastener maintains Class 3A thread tolerance per UNC standards with 1/4"-20 coarse threading and 6" length. Manufacturing complies with ASME B18.3 and ASTM F835 specifications. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental regulations for industrial components.