S-93085A561 1/4"-28 x 1" FF-S-92, QQ-P-35, MS24693-C298, NASM24693, SAE AMS2700 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh environments and long-term reliability.
• High tensile strength of 70,000 psi ensures secure fastening under heavy loads, reducing failure risks in demanding applications.
• Precision Class 2A fine threads provide smooth installation and reliable grip, minimizing cross-threading and improving assembly efficiency.
• Optimized Phillips No. 3 drive offers enhanced torque transfer and reduced cam-out, speeding up installation while maintaining driver bit integrity.
• Standard 100° countersink angle allows for flush mounting in various materials, delivering a clean finish and improved aerodynamics.
• Full threading along the 1" length ensures maximum engagement and holding power, adaptable to varying material thicknesses.
• Compliance with multiple industry standards including Fed. Spec. FF-S-92 and RoHS 3, guaranteeing quality and regulatory adherence for global supply chains.

Professional Applications & Engineering Value

This 1/4"-28 UNF flat head screw is engineered to address critical challenges in industrial assembly, where corrosion resistance and mechanical strength are paramount. The passivated 18-8 stainless steel material combats oxidation and chemical exposure, making it suitable for marine, automotive, and electronic enclosures. Its fine thread spacing and Class 2A thread fit enhance vibration resistance, preventing loosening in dynamic environments. The Phillips No. 3 drive simplifies high-volume installations, while the 100° countersink angle ensures seamless integration into panels and frames, reducing protrusion and improving safety. Ideal for OEM and MRO applications, this screw delivers consistent performance in aerospace, machinery, and infrastructure projects, supported by rigorous standards compliance.

Specification Summary & Compliance

This product adheres to precise dimensional tolerances, including Class 2A thread fit and UNF fine thread specifications for consistent engagement. It meets manufacturing and material standards such as Fed. Spec. FF-S-92, QQ-P-35, MS24693-C298, NASM24693, and SAE AMS2700, ensuring reliability across industrial uses. Environmental and safety compliance is confirmed with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting sustainable and safe procurement practices.