S-90585A076 1/2"-20 x 1 1/2" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and chemical exposure
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing performance
• Precision fine threading with UNF Class 3A fit ensuring secure, vibration-resistant fastening in critical assemblies
• Enhanced surface protection through passivated finish, extending service life by preventing oxidation and galling
• Optimized flush mounting with standard 82° countersink angle and flat head design for seamless, aerodynamic surfaces
• Efficient installation using 5/16" hex drive for high-torque application without cam-out risks
• Full regulatory compliance meeting ASME B18.3 dimensional standards and environmental regulations (RoHS 3, REACH)

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 316 stainless steel flat head screws deliver critical corrosion resistance where exposure to chemicals, moisture, or marine conditions would compromise ordinary fasteners. The combination of UNF fine threading and Class 3A fit provides superior vibration resistance in precision equipment, while the passivated finish enhances surface durability against wear and seizure. The 82° countersink and flat head profile create flush surfaces essential for aerodynamic components, machinery guards, and structural assemblies where protrusions are unacceptable. These fully threaded fasteners maintain consistent clamping force across the entire 1½" length, making them ideal for securing thick materials in marine hardware, chemical processing equipment, and food processing machinery where hygiene and corrosion resistance are paramount.

Specification Summary & Compliance

This 1/2"-20 UNF flat head screw maintains precision Class 3A thread fit with dimensional compliance to ASME B18.3 specifications. Manufacturing adheres to strict tolerance controls with head diameter maintained within -0.066" to 0" tolerance range. The product meets environmental compliance standards including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring safe use across various industrial applications without hazardous substance restrictions.