S-91858A854 1/2"-13 x 1 3/4" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction and passivated finish, ideal for harsh environments like marine or chemical processing
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B80 hardness for reliable performance under high stress
• Precise flush mounting with standard 82° countersink angle and flat head design, ensuring a smooth, secure fit in assembled components
• Easy installation and removal via slotted drive style, compatible with common hand tools for efficient maintenance
• Consistent thread engagement with UNC coarse threading and Class 2A fit, reducing cross-threading risks in industrial assemblies
• Full-length threading for maximum grip along the entire 1-3/4" length, enhancing load distribution in heavy-duty applications
• Regulatory compliance assurance meeting ASME B18.6.3, RoHS 3, and REACH standards for safe, quality-driven usage

Professional Applications & Engineering Value

This 1/2"-13 UNC flat head screw delivers critical engineering value in demanding sectors like marine equipment, food processing machinery, and chemical plant infrastructure. Crafted from 316 stainless steel, it resists pitting and corrosion from chlorides or acidic exposure, extending service life in moisture-rich settings. The passivated finish enhances surface durability, while the coarse UNC thread and Class 2A fit ensure rapid, secure fastening—minimizing assembly errors in high-vibration environments. Its fully threaded design and 82° countersink enable flush installations in metal or composite panels, supporting structural integrity where surface smoothness is paramount. Ideal for OEMs and MRO teams, this screw addresses common failure points like galvanic corrosion and thread stripping, offering a reliable, standards-compliant solution for critical joints.

Specification Summary & Compliance

This fastener adheres to ASME B18.6.3 specifications, with precise Class 2A thread fit and UNC coarse threads (1/2"-13 size) for consistent dimensional accuracy. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material traceability. Manufactured to inch system standards, it features a 1-3/4" length, 0.5" thread diameter, and standard flat head profile, guaranteeing interoperability in global industrial applications.