S-97972A219 5/16"-18 x 2" Extreme-Strength Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide steel coating, extending service life in harsh industrial environments
• Superior load-bearing capability with 180,000 PSI tensile strength, ensuring reliable performance under high-stress conditions
• Enhanced installation efficiency through coarse UNC threading and Class 2A fit, reducing cross-threading risks during assembly
• Secure fastening with integrated flange that distributes clamping force evenly, eliminating the need for separate washers
• Optimized torque transmission via external hex drive and 3/8" head width, preventing tool slippage during tightening
• Durable surface hardness at Rockwell C38, maintaining thread integrity through repeated installations
• Versatile partial threading design allowing precise grip length control for varied material thicknesses

Professional Applications & Engineering Value

Engineered for heavy-duty industrial assemblies, this black-oxide steel hex head screw addresses critical challenges in machinery manufacturing and structural applications. The 5/16"-18 UNC coarse thread configuration ensures rapid installation while maintaining Class 2A thread fit precision, significantly reducing assembly time in high-volume production environments. The flanged hex head design provides superior bearing surface distribution, preventing material deformation in soft substrates. With 180,000 PSI tensile strength and Rockwell C38 hardness, this partially threaded screw delivers reliable performance in vibration-prone applications, from equipment frames to automotive components, while the black-oxide coating provides essential corrosion protection in moderately corrosive operating conditions.

Specification Summary & Compliance

Manufactured to inch system standards with precise Class 2A thread fit tolerances ensuring consistent mating with corresponding nuts. The 5/16"-18 UNC coarse thread follows established industrial threading specifications, while the partially threaded design provides 1" minimum thread engagement length. The black-oxide steel composition and external hex drive configuration comply with industry-standard fastener requirements for mechanical properties and installation compatibility. Meets applicable material and performance specifications for industrial fasteners.