S-93085A653 1/4"-20 x 1/2" FF-S-92, QQ-P-35, MS24693-94B, NASM24693, SAE AMS2700 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with Black-Oxide coated 18-8 Stainless Steel, ideal for harsh industrial environments and extended service life.
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B70 hardness for reliable performance under high-stress conditions.
• Precise Class 2A thread fit ensures smooth assembly and secure fastening with reduced risk of cross-threading in coarse UNC threads.
• 100° countersink angle and flat head design provides a flush, low-profile finish that minimizes protrusion and enhances safety in assembled products.
• Broad regulatory compliance including RoHS 3 and REACH, meeting stringent environmental and safety standards for global supply chains.
• Fully threaded shank maximizes grip and load distribution across the entire length for stronger, more uniform clamping force.
• Phillips drive (No. 3 size) allows for efficient installation with common tools, reducing assembly time and improving workflow efficiency.

Professional Applications & Engineering Value

This 1/4"-20 UNC flat head screw is engineered to address critical challenges in industrial assembly, where corrosion resistance and high tensile strength are paramount. The Black-Oxide 18-8 Stainless Steel construction provides excellent protection against oxidation and chemical exposure, making it suitable for outdoor equipment, marine hardware, and automotive components. The fully threaded coarse UNC thread design ensures rapid installation and robust holding power in materials like metal and hard plastics, while the 100° countersink angle allows the flat head to sit flush, preventing snagging and improving aerodynamic or aesthetic profiles. By complying with multiple federal and aerospace specifications, these screws deliver reliable performance in demanding applications such as machinery frames, electronic enclosures, and structural assemblies, reducing maintenance needs and downtime.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with Class 2A thread fit for standard tolerance and ease of assembly. It meets Fed. Spec. FF-S-92, QQ-P-35, MS24693-94B, NASM24693, and SAE AMS2700, ensuring adherence to rigorous manufacturing and material standards. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming its suitability for environmentally conscious and regulated industries.