S-91253A020 10-32 x 2 1/4" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 130,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Precision Class 3A threads provide superior fit and vibration resistance, minimizing loosening and ensuring long-term assembly integrity.
• Black-oxide finish on alloy steel offers enhanced corrosion resistance, extending service life in harsh industrial environments.
• Rockwell C39 hardness delivers excellent wear resistance, maintaining thread integrity through repeated use and installation.
• Partially threaded design with 82° countersink allows for precise flush mounting and secure fastening in countersunk holes.
• Fine UNF thread spacing enables finer adjustments and improved clamping force distribution in precision assemblies.
• Hex drive design facilitates easy installation and removal with standard tools, reducing assembly time and labor costs.

Professional Applications & Engineering Value

Engineered for industrial and mechanical assemblies, these 10-32 UNF flat head screws address critical challenges in precision fastening. The Black-Oxide Alloy Steel construction provides durability against environmental factors, while the Class 3A thread fit ensures minimal backlash and superior load distribution in high-vibration settings like machinery, automotive, and aerospace components. The partially threaded shank and 82° countersink angle allow for secure, flush installations in sheet metal, enclosures, and structural frameworks, preventing protrusion and enhancing safety. With a fine thread spacing, these screws deliver enhanced grip in thin materials, reducing the risk of stripping and improving overall joint reliability. Ideal for applications requiring high tensile strength and compliance with rigorous industry standards, these fasteners support efficient maintenance and long-term operational stability.

Specification Summary & Compliance

This product adheres to Class 3A thread tolerance per UNF standards, ensuring precise dimensional accuracy and interchangeability. Manufactured in accordance with ASTM F835 specifications, it meets strict performance criteria for mechanical properties. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental safety and restricts hazardous substances, supporting sustainable procurement practices in global supply chains.