S-90585A014 5-40 x 1/4" 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 and passivated finish for long-lasting performance in harsh environments
• High tensile strength of 70,000 psi ensures reliable fastening under heavy loads and vibration
• Precise Class 3A thread fit provides smooth installation and secure, tight connections
• Fully threaded design offers maximum grip and holding power across the entire length
• 82° countersink angle and flat head allows for flush mounting, reducing snagging and improving aesthetics
• Hex drive (5/64") compatibility enables easy installation with standard tools, speeding up assembly
• Compliance with ASME B18.3, RoHS 3, and REACH ensures quality, safety, and environmental standards are met

Professional Applications & Engineering Value

These 5-40 UNC flat head screws are engineered to address common industrial challenges, such as corrosion in marine or chemical settings, thanks to the 316 Stainless Steel material and passivated finish. The coarse UNC thread and Class 3A fit provide quick, secure fastening in metals and plastics, reducing assembly time and minimizing loosening from vibrations. With a 1/4" length and fully threaded design, they offer consistent clamping force in tight spaces, making them ideal for machinery, electronics, and structural applications where reliability and compliance with ASME B18.3 are critical.

Specification Summary & Compliance

This screw features a 5-40 UNC thread with Class 3A tolerance for precise fit, a head diameter of 0.281", and length of 1/4". It meets ASME B18.3 specifications, ensuring dimensional accuracy and performance. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and safe for various industrial uses.