S-93401A110 4-40 x 1/2" ASTM F835, MS24667-3 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 140,000 PSI provides superior resistance to breaking and stripping under high-stress conditions.
• Precise Class 3A thread fit ensures reliable engagement and consistent clamping force, reducing the risk of assembly failure.
• Corrosion-resistant cadmium plating on alloy steel enhances durability and extends service life in harsh industrial environments.
• Fully threaded design offers maximum grip and holding power along the entire length for secure fastening.
• Standard 82° countersink angle allows for a flush, low-profile finish that minimizes protrusion and improves safety.
• Hex drive style (1/16") enables high-torque installation with common tools, speeding up assembly processes.
• Compliance with ASTM F835 MS24667-3 guarantees consistent quality and performance for critical applications.

Professional Applications & Engineering Value

This 4-40 UNC flat head screw is engineered to address common industrial challenges such as vibration loosening, material fatigue, and corrosion. Manufactured from cadmium-plated alloy steel, it combines high Rockwell C39 hardness with excellent tensile strength, making it ideal for machinery, electronics, and aerospace assemblies where reliability is non-negotiable. The coarse thread spacing and fully threaded profile ensure rapid installation and robust retention in softer materials or pre-tapped holes. Its right-hand thread and standard flat head design facilitate easy integration into countersunk holes, providing a smooth surface that reduces snagging and wear. By meeting rigorous standards, this screw delivers consistent performance in demanding environments, minimizing downtime and maintenance costs.

Specification Summary & Compliance

This screw adheres to Class 3A thread fit tolerances for precise engagement and is manufactured in accordance with ASTM F835 (MS24667-3) specifications. It features UNC coarse threads with a diameter of 0.112" and a length of 1/2", ensuring compatibility with standard inch-system components. The product is designed to meet industry requirements for dimensional accuracy and performance, with compliance typically extending to RoHS and REACH directives for material safety. Always verify specific regulatory needs for your application.