S-91781A714 1/2"-13 x 1 1/4" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh environments and long-term reliability.
• Exceptional mechanical strength offering 80,000 psi tensile strength and Rockwell B80 hardness for demanding, high-stress applications.
• Precise and reliable fastening ensured by Class 2A thread fit and UNC coarse threading, providing secure engagement and reduced cross-threading risk.
• Flush, low-profile installation with a standard 82° countersink angle and flat head design, perfect for applications requiring a smooth surface finish.
• Full-thread engagement along the entire 1-1/4" length, maximizing grip and load distribution in assembled components.
• Broad industrial compliance meeting ASME B18.6.3 specifications, RoHS 3, and REACH regulations for safe, standardized use.
• Easy manual installation and removal facilitated by the slotted drive style, compatible with standard screwdrivers.

Professional Applications & Engineering Value

These 1/2"-13 UNC flat head screws are engineered to address critical challenges in industrial assembly, including vibration resistance, material compatibility, and long-term structural integrity. The 18-8 stainless steel material, combined with a passivated finish, provides excellent resistance to oxidation and chemical exposure, making these fasteners ideal for marine, food processing, and outdoor equipment. The fully threaded design and coarse UNC thread ensure quick installation and robust holding power in wood, metal, and plastic substrates. By utilizing a standard 82° countersink angle, these screws sit flush with the surface, preventing snagging and maintaining aerodynamic or aesthetic profiles in machinery, automotive, and construction applications. Their compliance with ASME B18.6.3 guarantees dimensional consistency and interchangeability, reducing assembly errors and downtime.

Specification Summary & Compliance

This product features a 1/2"-13 UNC thread with Class 2A fit for standard tolerance and easy assembly. The screw is fully threaded, 1-1/4" in length, and includes a slotted drive and standard flat head profile. It conforms to ASME B18.6.3 dimensional and mechanical standards, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and sustainability in industrial use.