S-90585A201 4-40 x 3/16" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction and passivated finish, ideal for harsh environments and chemical exposure
• Exceptional tensile strength rated at 70,000 psi ensures reliable fastening under high-stress industrial applications
• Precision Class 3A thread fit guarantees tight tolerances and secure mating with nuts and threaded components
• Optimized flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
• Enhanced durability with Rockwell B55 hardness providing excellent wear resistance and long service life
• Easy installation using standard 1/16" hex drive tools, reducing assembly time and improving efficiency
• Full threading coverage along the 3/16" length ensures maximum grip strength and uniform load distribution

Professional Applications & Engineering Value

These 4-40 UNC flat head screws in 316 stainless steel with passivated finish address critical engineering challenges in demanding sectors like marine, chemical processing, and food equipment manufacturing. The coarse thread spacing and Class 3A thread fit provide vibration resistance and prevent loosening in dynamic environments, while the 82° countersink angle ensures flush mounting to eliminate protrusions and improve safety. The fully threaded design and hex drive facilitate quick, secure installations in tight spaces, making them ideal for industrial assembly where reliability and corrosion resistance are paramount.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with precise Class 3A thread fit and inch system measurements. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions adherence. Thread standards include UNC coarse spacing and right-hand direction with dimensional accuracy maintained across head diameter, length, and drive size.