S-97972A117 1/4"-20 x 1 1/4" Extreme-Strength Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black-oxide steel coating for longer service life in harsh environments
• Superior clamping force from the flange design that distributes load evenly and prevents surface damage
• High tensile strength of 180,000 psi ensures reliable performance under extreme mechanical stress
• Rockwell C38 hardness provides excellent wear resistance and maintains thread integrity
• Easy installation and removal with external hex drive that accommodates standard tools
• Secure fastening in coarse materials thanks to UNC coarse threading and Class 2A fit for quick assembly
• Optimized thread engagement with partial threading that reduces weight while maintaining holding power

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 1/4-20 UNC hex head screws combine black-oxide steel construction with precision Class 2A thread fit to solve critical fastening challenges. The flange design eliminates the need for separate washers while providing superior vibration resistance in machinery, automotive assemblies, and structural frameworks. With partial threading and coarse UNC threads, they deliver faster installation in soft materials and prevent cross-threading issues. The external hex drive ensures high torque capability for secure connections in high-stress environments where reliability is paramount.

Specification Summary & Compliance

This 1/4-20 UNC hex head screw features precision Class 2A thread fit with 1-1/4" length and coarse thread spacing per ASME/ANSI standards. Manufactured from black-oxide steel with Rockwell C38 hardness and 180,000 psi tensile strength, it complies with industry specifications for dimensional accuracy and mechanical performance. Meets RoHS and REACH environmental compliance requirements for industrial use.