S-94173A305 1/4"-28 x 2 1/2" 12-Point Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating on alloy steel, extending service life in demanding environments
• Exceptional torque transmission through the external 12-point drive, preventing tool slippage during high-torque applications
• High tensile strength of 170,000 psi ensures reliable performance under extreme mechanical loads
• Precise Class 2A thread fit guarantees consistent engagement and vibration resistance in assembled components
• Integrated flange design eliminates the need for separate washers, simplifying installation and reducing part count
• Rockwell C38 hardness provides excellent wear resistance and maintains thread integrity through repeated use
• Optimized partial threading allows for focused clamping force where needed most in your assembly

Professional Applications & Engineering Value

These 12-point screws with black-oxide alloy steel construction address critical industrial fastening challenges where corrosion resistance and high torque requirements coexist. The external 12-point drive delivers maximum torque transfer without cam-out, essential for maintenance operations and high-vibration environments. The 1/4"-28 UNF fine threads with Class 2A fit provide superior resistance to loosening in precision equipment, while the flanged design distributes clamping force evenly, preventing surface damage. Ideal for heavy machinery, automotive assemblies, and industrial equipment where 170,000 psi tensile strength and reliable performance are non-negotiable.

Specification Summary & Compliance

Manufactured to precise Class 2A thread fit standards with UNF fine threading (1/4"-28) and right-hand thread direction. Features include 2-1/2" length with 1" minimum thread engagement, 0.5" flange diameter, and partial threading configuration. Complies with ASME/ANSI standards for dimensional accuracy and meets RoHS and REACH environmental requirements.