S-94173A309 1/4"-28 x 4 1/2" 12-Point Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating protecting against rust in harsh industrial environments
• Exceptional torque transmission through the external 12-point drive design, preventing tool slippage during high-torque applications
• Enhanced load distribution with the integrated flange, reducing surface pressure and preventing material damage
• Reliable thread engagement with Class 2A fit UNF fine threads, ensuring precise alignment and vibration resistance
• Optimized strength-to-weight ratio through alloy steel construction with Rockwell C38 hardness and 170,000 psi tensile strength
• Simplified installation with partially threaded design, allowing for faster assembly in specific applications
• Consistent performance in right-hand threaded applications with standardized 1/4"-28 UNF specifications

Professional Applications & Engineering Value

This 12-point screw with black-oxide alloy steel construction addresses critical engineering challenges in heavy machinery, automotive assemblies, and industrial equipment. The external 12-point drive provides superior torque transmission compared to standard hex drives, eliminating rounding issues during high-stress installations. The partially threaded design with UNF fine threads ensures optimal clamping force distribution while preventing loosening under vibration. Combined with the flanged construction, this fastener eliminates the need for separate washers, reducing assembly time and component count. The black-oxide surface treatment provides essential corrosion protection without compromising dimensional accuracy, making it ideal for applications requiring both precision and durability in demanding environments.

Specification Summary & Compliance

Manufactured to precise Class 2A thread fit standards with 1/4"-28 UNF fine thread specifications and right-hand threading. The screw meets industry standards for dimensional accuracy with 4-1/2" length and 0.5" flange diameter. The alloy steel composition ensures compliance with industrial strength requirements, while the manufacturing process adheres to quality standards suitable for demanding mechanical applications. Material composition and surface treatment comply with industrial safety and environmental regulations for professional use.