S-91400A056 2-56 x 5/16" FF-S-92, QQ-P-35, MS51957-4 Stainless Steel Pan Head Phillips 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 80,000 psi ensures secure fastening under significant mechanical stress and vibration.
• Fully threaded design provides maximum grip and uniform load distribution along the entire length.
• Coarse UNC thread and Class 2A fit offer quick assembly and reliable thread engagement, reducing installation time.
• Phillips drive (No. 1 size) allows for efficient driving with common tools, minimizing cam-out and improving work efficiency.
• Pan head profile delivers a low-profile, rounded finish that resists snagging and provides a clean appearance.
• Compliance with key industry standards including Fed. Spec. FF-S-92, QQ-P-35, and MS51957-4, ensuring consistent quality and performance.

Professional Applications & Engineering Value

These 2-56 UNC pan head screws are engineered to address common industrial challenges such as corrosion, vibration loosening, and assembly efficiency. Made from passivated 18-8 stainless steel, they provide excellent resistance to oxidation and chemical exposure, making them suitable for electronics, machinery, and outdoor equipment. The coarse thread and fully threaded design ensure rapid installation and strong holding power in materials where fine threads may strip. With a Phillips drive, users benefit from reduced tool slippage and faster production cycles. Ideal for applications requiring high-strength fasteners that meet rigorous federal and environmental standards, these screws deliver dependable performance in demanding settings like aerospace, automotive, and industrial assembly lines.

Specification Summary & Compliance

This product adheres to precise dimensional tolerances, including Class 2A thread fit for consistent engagement and UNC coarse threading (2-56 size). It meets Fed. Spec. FF-S-92, QQ-P-35, and MS51957-4 for material and manufacturing quality. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental safety and regulatory adherence for global supply chains.