S-94173A339 7/16"-20 x 2 1/2" 12-Point Screws

Key Features & Benefits at a Glance

• Exceptional torque transmission through the external 12-point drive design, ensuring secure installation in high-torque applications
• Superior corrosion resistance with black-oxide coating on alloy steel, extending service life in demanding industrial environments
• High tensile strength rating of 170,000 psi provides reliable performance under extreme mechanical stress and vibration
• Precision thread engagement with Class 2A fit and UNF fine threading for secure fastening in critical assemblies
• Enhanced stability from the integrated flange design, distributing load evenly and preventing surface damage
• Optimized material hardness at Rockwell C38 ensures excellent wear resistance while maintaining necessary ductility
• Versatile partial threading allows for both secure clamping and rapid installation in various assembly configurations

Professional Applications & Engineering Value

This high-strength 12-point screw delivers exceptional engineering value in demanding industrial applications where reliability is paramount. The black-oxide alloy steel construction combined with Rockwell C38 hardness provides optimal resistance to wear, corrosion, and mechanical stress in harsh operating environments. The external 12-point drive system ensures maximum torque transmission without stripping, while the UNF fine threading maintains secure fastening in high-vibration applications such as heavy machinery, automotive assemblies, and industrial equipment. The flanged design eliminates the need for separate washers, reducing assembly time and providing superior load distribution. These partially threaded screws are engineered to solve critical fastening challenges where both clamping force and rapid installation are required.

Specification Summary & Compliance

This precision fastener features 7/16"-20 UNF fine threading with Class 2A thread fit ensuring consistent engagement and reliable performance. The manufacturing adheres to ASME/ANSI standards for dimensional accuracy, with precise thread diameter of 0.4375" and controlled thread spacing. The product meets industry standards for heavy-duty applications and complies with RoHS and REACH environmental regulations. With a specified minimum thread length of 1-1/4" and overall length of 2-1/2", this screw maintains strict dimensional tolerances throughout its construction for consistent performance in critical assemblies.