S-90585A714 1/2"-13 x 1 1/4" ASME B18.3 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction and passivated finish
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable, heavy-duty performance
• Precise, secure fastening ensured by Class 3A thread fit and UNC coarse threading, reducing the risk of cross-threading
• Flush, low-profile installation with a standard 82° countersink angle flat head, ideal for applications where a smooth surface is critical
• Efficient installation and removal with a 5/16" hex drive, providing positive torque transfer and reducing tool slippage
• Maximum grip and holding power from being fully threaded along the 1 1/4" length
• Guaranteed quality and safety through compliance with ASME B18.3, RoHS 3, and REACH regulations

Professional Applications & Engineering Value

These 316 stainless steel flat head screws are engineered to solve critical challenges in demanding industrial settings. The combination of 316 stainless steel material and a passivated finish provides outstanding resistance to corrosion from chemicals, saltwater, and extreme weather, making them ideal for marine, chemical processing, and outdoor infrastructure. The 1/2"-13 UNC coarse thread and Class 3A fit ensure rapid assembly and a secure, vibration-resistant connection in materials like metal and hard plastics. The flat head with an 82° countersink sits flush, eliminating protrusions for safer operation and smoother surfaces in machinery, frames, and assembly lines. This design delivers long-term reliability, reducing maintenance needs and downtime in heavy-duty fastening applications.

Specification Summary & Compliance

This screw features a 1/2"-13 UNC coarse thread with a precision Class 3A thread fit and is fully threaded. Manufactured to ASME B18.3 specifications, it ensures dimensional accuracy and interchangeability. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming it meets stringent environmental and safety standards for hazardous substances.