S-94173A343 1/2"-20 x 3" 12-Point Screws

Key Features & Benefits at a Glance

• Superior torque transmission with external 12-point drive design for reliable installation in high-stress applications
• Enhanced corrosion resistance through black-oxide coating on alloy steel, extending service life in demanding environments
• Exceptional strength performance with 170,000 PSI tensile strength and Rockwell C38 hardness for heavy-duty applications
• Reduced assembly time with integrated flange that eliminates need for separate washers while providing superior load distribution
• Precise thread engagement through Class 2A UNF fine threading (1/2"-20) ensuring secure fastening in critical assemblies
• Optimized partial threading design allowing for concentrated thread engagement where maximum clamping force is required
• Industry-standard compatibility with inch measurement system for seamless integration into existing industrial equipment

Professional Applications & Engineering Value

This 12-point flange screw delivers exceptional engineering value in heavy-duty industrial applications where vibration resistance and high torque requirements are critical. The black-oxide alloy steel construction provides superior corrosion protection while maintaining the 170,000 PSI tensile strength needed for structural assemblies, machinery frames, and power transmission equipment. The external 12-point drive enables maximum torque application without stripping, while the integrated 7/8" flange diameter distributes clamping force evenly, preventing surface damage and maintaining joint integrity. The UNF fine threading (1/2"-20) with Class 2A thread fit ensures precise engagement in threaded holes, reducing the risk of cross-threading in high-value components. This combination of features makes it ideal for construction equipment, automotive assemblies, and industrial machinery where reliability under extreme conditions is paramount.

Specification Summary & Compliance

This fastener maintains Class 2A thread fit tolerance according to UNF standards, ensuring consistent performance across industrial applications. The manufacturing adheres to inch system specifications with precise dimensional control including 3" length, 1/2"-20 UNF fine threading, and 7/8" flange diameter. The black-oxide surface treatment on alloy steel substrate provides corrosion resistance while meeting industry standards for heavy-duty fasteners. Material properties including Rockwell C38 hardness and 170,000 PSI tensile strength confirm compliance with industrial grade requirements for demanding mechanical applications.