S-90585A138 10-32 x 1 3/8" ASME B18.3, ASTM F879 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
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing performance
• Precision thread engagement with Class 3A fit and 10-32 UNF fine threads ensuring secure, vibration-resistant fastening
• Streamlined installation featuring flat head design with standard 82° countersink angle for flush mounting in industrial assemblies
• Enhanced torque transmission through hex drive design with 1/8" drive size for secure tool engagement
• Full-threaded coverage along the 1-3/8" length provides maximum grip and distribution of clamping force
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial applications

Professional Applications & Engineering Value

These 316 stainless steel flat head screws deliver critical performance advantages in demanding environments where corrosion resistance and mechanical reliability are paramount. The combination of UNF fine threading with Class 3A thread fit ensures precise engagement in machinery, electronic enclosures, and marine equipment, preventing loosening under vibration. The passivated finish enhances the natural corrosion resistance of 316 stainless steel, making these hex drive screws ideal for chemical processing, offshore applications, and food processing equipment where moisture and corrosive agents are present. The fully threaded design maximizes contact surface area, distributing clamping force evenly across the entire 1-3/8" length for superior joint integrity in structural assemblies and precision instruments.

Specification Summary & Compliance

These flat head screws maintain Class 3A thread fit tolerance with 10-32 UNF fine threads and are manufactured to ASME B18.3 specifications. The dimensional accuracy includes head diameter tolerance of -0.052" to 0" and standard 82° countersink angle. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety, while the mechanical properties including 70,000 psi tensile strength and Rockwell B55 hardness meet industrial fastening requirements for critical applications.