S-91772A119 4-40 x 1 1/2" ASME B18.6.3 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 industrial environments
• High tensile strength of 70,000 psi ensures reliable fastening under significant mechanical stress
• Rockwell B70 hardness provides excellent durability and resistance to wear over time
• Class 2A thread fit guarantees precise, consistent engagement for secure assemblies
• Phillips No. 1 drive offers efficient installation with reduced cam-out risk
• Fully threaded 1-1/2" length allows for maximum grip and adjustability in various material thicknesses
• Coarse UNC threading enables quick assembly and reduced cross-threading incidents

Professional Applications & Engineering Value

These 4-40 UNC pan head screws are engineered to address common industrial challenges, such as vibration loosening and environmental corrosion. The passivated 18-8 stainless steel material provides exceptional resistance to rust and chemical exposure, making them suitable for outdoor equipment, marine applications, and food processing machinery. The rounded pan head design distributes clamping force evenly, reducing surface damage, while the Phillips drive ensures straightforward installation with standard tools. With a coarse thread spacing and fully threaded shank, these screws offer rapid assembly and reliable holding power in metals, plastics, and composites, enhancing productivity in manufacturing, electronics, and automotive sectors.

Specification Summary & Compliance

This screw features a Class 2A thread fit per UNC standards, ensuring dimensional accuracy and interchangeability. It complies with ASME B18.6.3 for mechanical and dimensional requirements, RoHS 3 (2015/863/EU) for restricted hazardous substances, and REACH (EC 1907/2006) for chemical safety, affirming its suitability for global industrial use.