S-94173A338 7/16"-20 x 2 1/4" 12-Point Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black-oxide coating for extended service life in harsh industrial environments
• Superior torque transmission through external 12-point drive design, preventing tool slippage during high-tension applications
• Precision thread engagement with Class 2A UNF fine threading ensuring reliable, vibration-resistant connections
• Exceptional mechanical strength delivering 170,000 PSI tensile rating and Rockwell C38 hardness for heavy-duty applications
• Optimized load distribution via integrated flange design, eliminating the need for separate washers
• Controlled thread engagement through partial threading for precise clamping force management
• Industry-standard compatibility with UNF fine thread specifications for seamless integration into existing assemblies

Professional Applications & Engineering Value

This 12-point flange screw addresses critical engineering challenges in heavy machinery, automotive, and structural applications where vibration resistance and consistent clamping force are paramount. The black-oxide alloy steel construction provides superior protection against corrosion while maintaining the material's inherent strength characteristics. The UNF fine threading with Class 2A precision ensures optimal stress distribution across engaged threads, significantly reducing the risk of thread stripping under dynamic loads. The combination of partial threading and integrated flange allows engineers to precisely control engagement depth while eliminating components, streamlining assembly processes in high-volume manufacturing and maintenance operations where reliability and efficiency are critical.

Specification Summary & Compliance

Manufactured to exacting standards with Class 2A thread fit tolerance per UNF specifications, ensuring consistent performance across industrial applications. The screw features 7/16"-20 UNF fine threading with right-hand direction and partial threading configuration. Material compliance includes alloy steel composition with black-oxide surface treatment, delivering specified mechanical properties of 170,000 PSI tensile strength and Rockwell C38 hardness. Meets relevant industrial standards for heavy-duty fasteners and complies with RoHS and REACH environmental directives.