S-94173A347 1/2"-20 x 5" 12-Point Screws

Key Features & Benefits at a Glance

• Superior torque transmission with external 12-point drive and 1/2" drive size for reliable installation in high-stress applications
• Exceptional corrosion resistance thanks to black-oxide coating on alloy steel, extending service life in harsh environments
• High-strength performance with 170,000 PSI tensile strength and Rockwell C38 hardness for demanding industrial applications
• Precise thread engagement with Class 2A UNF fine threading ensuring secure fastening and vibration resistance
• Enhanced load distribution through flanged design that eliminates the need for separate washers
• Optimized partial threading providing maximum grip length where needed while reducing weight
• Industry-standard compatibility with right-hand UNF fine threads for seamless integration into existing assemblies

Professional Applications & Engineering Value

This high-strength 12-point screw delivers exceptional engineering value in demanding industrial environments where reliability is paramount. The black-oxide alloy steel construction provides superior corrosion resistance while maintaining the 170,000 PSI tensile strength required for heavy machinery, structural assemblies, and automotive applications. The external 12-point drive system ensures maximum torque transmission without stripping, while the UNF fine threading offers superior vibration resistance compared to coarse threads. The flanged design distributes clamping force evenly, preventing surface damage and eliminating the need for additional components. These features combine to create an ideal heavy-duty fastener for applications requiring repeated disassembly and reassembly without performance degradation.

Specification Summary & Compliance

This 12-point screw features precise Class 2A thread fit with 1/2"-20 UNF fine threading and right-hand thread direction. The manufacturing complies with UNF (Unified National Fine) standards for thread form and spacing. The black-oxide surface treatment provides corrosion protection while the alloy steel material with Rockwell C38 hardness ensures consistent performance. The 5" length with 1 1/4" minimum thread length and 7/8" flange diameter provides optimal fastening capabilities for industrial applications requiring high-strength, reliable connections.