S-91253A003 10-32 x 1/2" ASME B18.3 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, ideal for harsh industrial environments
• Exceptional tensile strength of 130,000 psi prevents fastener failure under high-stress conditions
• Precision Class 3A thread fit ensures tight tolerances and reliable engagement in critical assemblies
• 82° countersink angle provides flush mounting for streamlined surfaces and reduced snagging
• Hex drive design delivers maximum torque transfer and prevents cam-out during installation
• Full threading along the 1/2" length enables adjustable positioning and consistent clamping force
• Rockwell C39 hardness maintains thread integrity and resists wear in repetitive applications

Professional Applications & Engineering Value

This 10-32 UNF flat head screw addresses critical challenges in precision machinery, automotive, and aerospace assemblies where vibration resistance and dimensional stability are paramount. The black-oxide alloy steel construction provides enhanced corrosion protection without compromising the 130,000 psi tensile strength, making it suitable for high-load applications. The fine thread spacing and Class 3A fit ensure secure fastening in tapped holes, reducing the risk of loosening in dynamic environments. The hex drive configuration allows for high-torque installation in confined spaces, while the 82° countersink maintains aerodynamic and aesthetic surfaces in finished products.

Specification Summary & Compliance

Manufactured to ASME B18.3 and ASTM F835 specifications with Class 3A thread fit for precision tolerance. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features right-hand UNF fine threads, 1/2" length, and Rockwell C39 hardness for consistent performance in industrial fastening applications.