S-94173A307 1/4"-28 x 3 1/2" 12-Point Screws

Key Features & Benefits at a Glance

• Exceptional durability with Black-Oxide Alloy Steel construction providing corrosion resistance and extended service life in harsh environments
• Superior torque transmission through the external 12-point drive design, preventing tool slippage during high-torque applications
• Precision fastening capability with Class 2A thread fit ensuring consistent, reliable connections in critical assemblies
• Enhanced load distribution from the integrated flange design, reducing surface pressure and preventing material damage
• Optimized strength-to-weight ratio with 170,000 psi tensile strength and Rockwell C38 hardness for demanding structural applications
• Controlled thread engagement through partial threading design, allowing for precise clamping force in specific joint configurations
• Fine thread advantage with 1/4"-28 UNF spacing providing superior vibration resistance and improved tension control

Professional Applications & Engineering Value

This 12-point screw delivers exceptional engineering value in heavy-duty industrial applications where reliability is paramount. The Black-Oxide Alloy Steel construction provides superior corrosion protection while maintaining the 170,000 psi tensile strength required for structural fastening. The external 12-point drive system enables high-torque installation without cam-out, making it ideal for confined spaces and high-vibration environments. The UNF fine thread with Class 2A fit ensures precise engagement in critical machinery, automotive assemblies, and aerospace components where vibration resistance and consistent clamping force are essential. The partially threaded design allows for controlled joint compression, while the integrated flange distributes load evenly, protecting sensitive materials from damage during tightening operations.

Specification Summary & Compliance

This precision fastener features 1/4"-28 UNF fine threads with Class 2A thread fit ensuring dimensional accuracy and interchangeability. Manufactured to industry standards for 12-point screws, the product maintains consistent Rockwell C38 hardness and meets rigorous mechanical property requirements. The Black-Oxide surface treatment provides corrosion protection while maintaining dimensional stability. Compliant with relevant industrial fastening specifications and quality assurance protocols for high-strength applications, ensuring reliability in demanding engineering environments.