S-93401A507 1/4"-20 x 5/8" ASTM F835, MS24667-29 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Maximum tensile strength of 140,000 psi for superior load-bearing capacity and resistance to failure in demanding applications.
• Exceptional corrosion resistance provided by the cadmium plating, extending the screw's service life in harsh industrial environments.
• Precise Class 3A thread fit ensures tighter tolerances and more secure, vibration-resistant assemblies compared to standard fits.
• Full threading along the entire 5/8" length allows for maximum grip and adjustment flexibility in various material thicknesses.
• 82° countersink angle enables a clean, flush finish with standard countersunk holes, improving aesthetics and safety.
• Hex drive design offers high torque transmission and reduces the risk of cam-out for efficient and secure installation.
• High hardness (Rockwell C39) provides excellent wear resistance and durability, maintaining thread integrity through repeated use.

Professional Applications & Engineering Value

This cadmium-plated alloy steel flat head screw is engineered to solve critical challenges in heavy-duty assembly. The combination of a 1/4"-20 UNC coarse thread and Class 3A fit provides exceptional vibration resistance, preventing loosening in machinery, automotive, and structural applications. The fully threaded design ensures maximum engagement in both thin and thick materials, offering versatile clamping force. The 82° flat head profile with a hex drive allows for a secure, flush installation that minimizes protrusions, making it ideal for applications where aerodynamics or safety are concerns. Its high tensile strength and robust material construction make it a reliable choice for critical connections that must withstand significant stress and environmental exposure.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, featuring a 1/4"-20 UNC coarse thread with a Class 3A thread fit for high precision. It is manufactured in compliance with the ASTM F835 specification and meets the requirements for MS24667-29. The product conforms to industry standards for heavy-duty flat head hex drive screws, ensuring reliability and performance in professional and industrial settings.