S-93401A612 1/4"-20 x 1" ASTM F835, MS24667-31 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Maximum Durability – Cadmium-plated alloy steel construction provides excellent corrosion resistance and long-term reliability in harsh industrial environments.
• Superior Thread Engagement – Class 3A thread fit ensures precise, secure fastening with minimal risk of cross-threading or loosening under vibration.
• High Tensile Strength – Rated at 140,000 psi tensile strength for dependable performance in heavy-duty and high-stress applications.
• Efficient Installation – Hex drive (5/32") allows for quick, high-torque installation with standard tools, reducing assembly time.
• Flush Mounting Capability – Standard 82° countersink angle enables a smooth, flush finish when installed in chamfered holes.
• Full Thread Coverage – Fully threaded 1/4"-20 UNC coarse thread design provides consistent holding power along the entire screw length.
• Enhanced Hardness – Rockwell C39 hardness offers excellent resistance to wear and deformation during installation and service.

Professional Applications & Engineering Value

These 1/4"-20 UNC flat head screws are engineered to address critical fastening challenges in demanding industrial settings. The cadmium-plated alloy steel construction delivers superior corrosion protection, making them ideal for outdoor equipment, machinery, and structural assemblies exposed to moisture or chemicals. The Class 3A thread fit and coarse threading ensure rapid, reliable installation in both soft and hard materials, reducing the risk of stripping. With a 140,000 psi tensile strength and Rockwell C39 hardness, these screws maintain integrity under extreme loads and vibrations, preventing joint failure in automotive, aerospace, and heavy machinery applications. The hex drive and 82° countersink further streamline assembly while providing a clean, aerodynamic surface finish.

Specification Summary & Compliance

This product adheres to Class 3A thread fit tolerances for precision and meets ASTM F835 specifications (identified as MS24667-31). It features UNC coarse threads (1/4"-20) with a fully threaded design and is manufactured from cadmium-plated alloy steel for enhanced performance. Compliant with RoHS and REACH environmental standards, it is suitable for use in regulated industries requiring strict material and manufacturing consistency.