S-94173A308 1/4"-28 x 4" 12-Point Screws

Key Features & Benefits at a Glance

• Superior torque transmission with the external 12-point drive, allowing for high-tightening forces without stripping
• Exceptional strength and durability from alloy steel with 170,000 psi tensile strength and Rockwell C38 hardness for heavy-duty applications
• Enhanced corrosion resistance thanks to the black-oxide surface treatment, extending service life in harsh environments
• Reliable thread engagement with UNF fine threading and Class 2A fit, ensuring precise, vibration-resistant connections
• Integrated flange design eliminates the need for a separate washer, providing increased bearing surface and simplified assembly
• Optimized for high-stress applications through partial threading, concentrating strength where it's needed most
• Industry-standard compatibility with right-hand UNF threads, making it suitable for a wide range of machinery and equipment

Professional Applications & Engineering Value

This 12-point screw is engineered to solve critical fastening challenges in demanding industrial environments. The black-oxide alloy steel construction provides excellent corrosion resistance while maintaining the 170,000 psi tensile strength necessary for high-stress applications. The external 12-point drive enables maximum torque application without cam-out, making it ideal for assembly lines where speed and reliability are crucial. The UNF fine threading and Class 2A thread fit ensure precise engagement in critical machinery, while the integrated flange distributes clamping force evenly, preventing surface damage and reducing assembly time. These features make it particularly valuable in automotive, heavy equipment, and aerospace applications where vibration resistance and structural integrity are paramount.

Specification Summary & Compliance

This screw features 1/4"-28 UNF fine threading with Class 2A thread fit for precision engagement and meets standard inch measurement specifications. The manufacturing complies with industry standards for 12-point drive systems and alloy steel fasteners. The product conforms to RoHS and REACH environmental directives and is manufactured following ASME/ANSI fastener specifications for dimensional accuracy and performance reliability.