S-94173A301 1/4"-20 x 3 1/2" 12-Point Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capability with 170,000 psi tensile strength and Rockwell C38 hardness for reliable performance in high-stress applications
• Enhanced corrosion resistance from the black-oxide coating, extending service life in demanding industrial environments
• Secure, high-torque installation enabled by the external 12-point drive and 12-point head design for precise tool engagement
• Optimized thread engagement with Class 2A UNC coarse threads ensuring consistent fit and vibration resistance
• Stable flange base that distributes clamping force evenly, reducing surface damage and improving joint integrity
• Versatile partial threading allowing unthreaded shank sections to act as precision dowels or pivot points
• Broad compatibility with standard 1/4"-20 coarse thread components, simplifying sourcing and assembly processes

Professional Applications & Engineering Value

This 12-point black-oxide alloy steel screw delivers critical engineering solutions where high tensile strength and corrosion resistance are paramount. The UNC coarse threading combined with Class 2A thread fit ensures rapid assembly while maintaining vibration resistance in heavy machinery, construction equipment, and automotive systems. The flanged design eliminates the need for separate washers, providing uniform load distribution that prevents surface deformation. The black-oxide coating creates a durable barrier against moisture and chemicals, making these partially threaded screws ideal for outdoor infrastructure, manufacturing equipment, and transportation applications where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to precise inch system dimensions with Class 2A thread fit tolerance and UNC coarse thread standard. The screw features a 1/4"-20 thread size with minimum 1" thread length and complies with industry standards for alloy steel fasteners. Meets material composition requirements for industrial applications and conforms to relevant ASME specifications for mechanical properties and dimensional accuracy.