S-91253A076 2-56 x 5/32" 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
• High tensile strength of 130,000 PSI ensures reliable performance under heavy loads
• Precise Class 3A thread fit for secure, vibration-resistant fastening in critical assemblies
• Hex drive design (0.050") provides superior torque transmission and slip-resistant installation
• Fully threaded coarse UNC pattern enables faster installation and stronger holding power
• 82° countersink angle creates flush surface finishes for aerodynamic and safety-critical applications
• Rockwell C39 hardness maintains structural integrity through repeated use cycles

Professional Applications & Engineering Value

Engineered for precision assemblies requiring flush mounting, these black-oxide alloy steel flat head screws solve common industrial challenges like corrosion-induced failure and vibration loosening. The hex drive configuration delivers maximum torque efficiency during installation in confined spaces, while the Class 3A UNC coarse threads provide rapid engagement in sheet metal, machinery, and electronic enclosures. With 130,000 PSI tensile strength and Rockwell C39 hardness, they maintain clamp force under dynamic loads, making them ideal for automotive components, aerospace fixtures, and heavy-duty equipment where reliability is paramount.

Specification Summary & Compliance

Manufactured to ASTM F835 specifications with Class 3A thread tolerances for precision fit. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features right-hand UNC coarse threading (2-56) with 82° flat head profile and fully threaded design for consistent performance across industrial applications.