S-97972A213 5/16"-18 x 1" Extreme-Strength Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 180,000 psi tensile strength for reliable performance in high-stress industrial environments
• Superior corrosion resistance thanks to the black-oxide steel finish, extending service life in demanding conditions
• Enhanced installation efficiency with coarse UNC threading and Class 2A fit ensuring quick, secure fastening
• Increased stability and vibration resistance from the integrated 5/8" flange that distributes load evenly
• Optimized torque transmission via the external hex drive design, preventing tool slippage during tightening
• Full-thread engagement capability along the 1" length for maximum grip strength in various material thicknesses
• Consistent mechanical properties with Rockwell C38 hardness maintaining dimensional stability under repeated stress

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these black-oxide steel hex head screws deliver exceptional performance where corrosion resistance and high tensile strength are critical. The UNC coarse thread configuration prevents cross-threading during assembly while providing superior pull-out resistance in softer materials. The integrated flange eliminates the need for separate washers, reducing component count and installation time in heavy-duty equipment, machinery frames, and structural assemblies. With fully threaded design ensuring maximum thread engagement, these external hex drive fasteners maintain consistent clamping force even under extreme vibration, making them ideal for automotive, construction, and manufacturing applications where joint integrity is non-negotiable.

Specification Summary & Compliance

Manufactured to precise inch system dimensions with Class 2A thread fit tolerance for consistent mating with standard nuts. Complies with UNC thread standards (5/16"-18) and features right-hand thread direction with coarse spacing. The black-oxide surface treatment provides corrosion protection while maintaining dimensional accuracy. Meets industry standards for heavy-duty fasteners with verified 180,000 psi tensile strength and Rockwell C38 hardness specifications. Suitable for applications requiring RoHS and REACH compliance in industrial environments.