S-91253A160 6-40 x 1/4" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating, ideal for harsh industrial environments
• Superior thread engagement with Class 3A fine thread fit for reliable, vibration-resistant connections
• High tensile strength of 130,000 psi ensures dependable performance under heavy loads
• Precision 82° countersink angle allows for flush mounting and clean aesthetic finishes
• Fully threaded design provides maximum grip length and uniform load distribution
• Hardened Rockwell C39 alloy steel delivers excellent durability and wear resistance
• 5/64" hex drive compatibility enables quick installation with standard industrial tools

Professional Applications & Engineering Value

These 6-40 UNF flat head screws with black-oxide alloy steel construction address critical industrial fastening challenges where corrosion resistance and high strength are paramount. The Class 3A thread fit and fine thread spacing provide superior vibration resistance in machinery, automotive assemblies, and precision equipment. The 82° countersink angle ensures seamless flush mounting in aerospace components and electronic enclosures, while the fully threaded design maximizes connection integrity across various material thicknesses. Engineered for demanding applications, these screws maintain dimensional stability and performance in high-stress environments where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to ASTM F835 specifications with Class 3A thread fit tolerance and UNF fine thread standard. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features include right-hand thread direction, 1/4" length, and 0.138" thread diameter with precise engineering for industrial applications.