S-91772A105 4-40 x 3/16" 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.
• Phillips No. 1 drive offers common tool compatibility and efficient installation.
• Coarse UNC thread with Class 2A fit facilitates quick assembly and secure holding power.
• Fully threaded design allows for maximum engagement and consistent clamping force.
• Compliance with ASME B18.6.3, RoHS 3, and REACH ensures quality, safety, and environmental standards are met.

Professional Applications & Engineering Value

This 4-40 UNC pan head screw is engineered to address common industrial challenges, such as vibration loosening and corrosion in demanding applications. The passivated 18-8 stainless steel material provides a protective layer that significantly enhances corrosion resistance, making it suitable for electronics, machinery, and outdoor equipment. Its coarse thread and Class 2A thread fit ensure easy installation and reliable performance in materials where fine threads might strip. The pan head design offers a low profile with good bearing surface, while the Phillips drive allows for efficient torque application, reducing assembly time and improving productivity in automated or manual settings.

Specification Summary & Compliance

This screw features a 4-40 UNC coarse thread with Class 2A dimensional accuracy for consistent fit. It is manufactured in compliance with ASME B18.6.3 specifications, ensuring precise engineering standards. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulatory requirements, confirming its safety and environmental compliance for global industrial use.