S-91253A035 0-80 x 3/8" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength – 130,000 psi rating ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Precision Class 3A Thread Fit – Delivers superior thread engagement and vibration resistance, minimizing loosening in critical assemblies.
• Corrosion-Resistant Black-Oxide Finish – Enhances durability and provides a protective layer against oxidation, extending service life in various environments.
• Full Threading with 82° Countersink – Allows for flush mounting and even load distribution, ideal for applications requiring a smooth surface finish.
• Hex Drive Design – Enables secure tool engagement and efficient installation, reducing slippage and assembly time.
• High Hardness (Rockwell C39) – Resists wear and deformation, maintaining dimensional stability through repeated use.
• Compliance with Major Standards – Meets ASME B18.3 and ASTM F835 specifications, ensuring consistent quality and interoperability in professional settings.

Professional Applications & Engineering Value

Engineered for precision-driven industries, these 0-80 UNF flat head screws address common challenges in electronics, aerospace, and machinery assembly. The Black-Oxide Alloy Steel construction combats corrosion while the fine UNF threads and Class 3A fit provide exceptional clamp load retention, preventing joint failure in vibration-prone environments. The 82° countersink angle and fully threaded design ensure seamless integration into tapered holes, offering a flush finish that minimizes protrusion. With a hex drive for torque control, these screws streamline installation in confined spaces, reducing labor costs and enhancing project efficiency. Ideal for applications demanding high strength-to-weight ratios and regulatory adherence.

Specification Summary & Compliance

This product adheres to Class 3A thread tolerance per UNF standards, ensuring precise fit and interchangeability. Manufacturing follows ASME B18.3 and ASTM F835 specifications for dimensional consistency and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets environmental and safety requirements for global supply chains. The screw features a right-hand thread direction and is supplied in inch measurements, with full threading and standardized head profile for reliable performance.