S-91400A121 4-40 x 1 1/8" FF-S-92, QQ-P-35, MS51957-121 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments.
• High tensile strength of 80,000 PSI ensures reliable, long-lasting fastening under demanding mechanical loads.
• Easy installation and removal with a standard Phillips #1 drive, reducing assembly time and tool wear.
• Full threading and Class 2A fit provide consistent engagement and secure holding power across the entire length.
• Rounded pan head design offers a low-profile, finished appearance while minimizing snagging risks.
• Coarse UNC thread enables quick assembly and superior performance in softer materials or where vibration is a concern.
• Compliance with major standards including Fed. Spec. FF-S-92, QQ-P-35, and MS51957-121, ensuring quality and interchangeability.

Professional Applications & Engineering Value

Engineered for precision and endurance, these 4-40 UNC rounded pan head screws are crafted from passivated 18-8 stainless steel to combat corrosion in demanding settings like electronics enclosures, machinery assembly, and outdoor equipment. The fully threaded design and coarse thread spacing ensure rapid, secure fastening even in applications prone to vibration, reducing maintenance needs. With a Phillips #1 drive and Class 2A thread fit, they deliver consistent torque transfer and ease of use, streamlining production lines while meeting strict industrial specifications for reliability and safety.

Specification Summary & Compliance

This screw features precise Class 2A thread fit and adheres to UNC thread standards for dimensional accuracy. It complies with Fed. Spec. FF-S-92, QQ-P-35, and MS51957-121 manufacturing specifications, and is verified as RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring environmental safety and regulatory adherence for global industrial use.