S-91400A108 4-40 x 3/8" FF-S-92, QQ-P-35, MS51957-15 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 extended service life.
• High tensile strength of 80,000 PSI ensures reliable fastening under significant mechanical stress, reducing the risk of failure.
• Coarse UNC thread and Class 2A fit provide faster installation and excellent grip in a wide range of materials.
• Fully threaded design maximizes thread engagement and clamping force along the entire 3/8" length for secure assemblies.
• Rounded Pan Head with Phillips No. 1 Drive offers a low-profile, flush finish and easy driving with common tools.
• Compliance with Fed. Spec. FF-S-92, QQ-P-35, and MS51957-15 guarantees consistent quality and interchangeability for industrial applications.
• RoHS 3 and REACH compliant for use in regulated industries without hazardous substance concerns.

Professional Applications & Engineering Value

This 4-40 UNC Rounded Pan Head Phillips Screw is engineered to address common industrial challenges such as vibration loosening and environmental degradation. The Passivated 18-8 Stainless Steel material provides excellent resistance to oxidation and chemicals, making it suitable for electronics, machinery, and outdoor equipment where moisture or corrosive agents are present. The coarse thread design ensures quick and secure fastening in softer materials or pre-tapped holes, reducing assembly time. With a fully threaded shank and 80,000 PSI tensile strength, it delivers uniform stress distribution and high clamp load, preventing joint failure in dynamic applications. These screws are ideal for precision assemblies requiring reliable, repeatable performance and compliance with stringent federal and environmental standards.

Specification Summary & Compliance

This screw features a 4-40 UNC coarse thread with Class 2A thread fit for standard tolerance and easy assembly. It is manufactured in accordance with Fed. Spec. FF-S-92, QQ-P-35, and MS51957-15, ensuring dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted substances for safe use in various industrial and consumer applications.