S-94173A344 1/2"-20 x 3 1/2" 12-Point Screws

Key Features & Benefits at a Glance

• Superior torque transmission with external 12-point drive and 1/2" drive size for reliable tightening in high-stress applications
• Enhanced corrosion resistance from black-oxide alloy steel surface treatment, extending service life in harsh industrial environments
• Exceptional mechanical strength with 170,000 psi tensile strength and Rockwell C38 hardness for heavy-duty performance requirements
• Precise thread engagement through Class 2A UNF fine threading ensuring secure fastening and vibration resistance
• Integrated flange design eliminates need for separate washers while providing superior load distribution
• Optimized partial threading allows for focused clamping force on critical connection points
• Right-hand thread direction with standard UNF specification for compatibility with existing industrial equipment

Professional Applications & Engineering Value

This black-oxide alloy steel 12-point screw delivers critical performance advantages in demanding industrial applications where high tensile strength and reliable torque transmission are paramount. The external 12-point drive configuration enables superior wrench engagement, preventing slippage during high-torque installation in confined spaces. The UNF fine threading (1/2"-20) provides enhanced thread engagement density, significantly improving vibration resistance in heavy machinery, automotive assemblies, and structural frameworks. The flanged design integrates washer functionality, streamlining installation while distributing clamp load effectively across joined surfaces. With partial threading concentrating force where needed most, this fastener solves common challenges of joint integrity maintenance in high-vibration environments, making it ideal for critical connections in construction equipment, industrial machinery, and transportation systems requiring 170,000 psi tensile rating reliability.

Specification Summary & Compliance

This 12-point screw maintains precision Class 2A thread fit tolerances per UNF standards, ensuring consistent performance across industrial applications. The fastener features 1/2"-20 UNF fine threading with right-hand direction and 3 1/2" length with minimum thread length of 1 1/4". Manufacturing complies with industry standards for dimensional accuracy and mechanical properties, with black-oxide surface treatment providing corrosion protection. The alloy steel construction meets material specifications for high-strength applications, with verification of Rockwell C38 hardness and 170,000 psi tensile strength ratings. Components conform to RoHS and REACH environmental compliance requirements for industrial use.