S-94173A314 5/16"-18 x 4 1/2" 12-Point Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating for extended service life in harsh industrial environments
• Superior high-strength performance with 170,000 psi tensile strength and Rockwell C38 hardness for demanding applications
• Enhanced torque transmission through external 12-point drive design for secure installation and removal
• Reliable thread engagement with UNC coarse threading and Class 2A thread fit ensuring consistent fastening performance
• Integrated flange design eliminates need for separate washers while providing superior load distribution
• Optimized partial threading allows for precise clamping force control in various material thicknesses
• Heavy-duty construction using alloy steel for maximum durability under extreme mechanical stress

Professional Applications & Engineering Value

These 12-point screws with black-oxide alloy steel construction address critical industrial fastening challenges where corrosion resistance and high tensile strength are paramount. The external 12-point drive system provides superior torque transmission compared to standard hex drives, reducing tool slippage and damage in high-torque applications. The integrated flange design distributes clamping force effectively across wider surfaces, preventing material deformation in soft substrates. With UNC coarse threading and Class 2A thread fit, these screws deliver reliable performance in vibration-prone environments common in heavy machinery, construction equipment, and automotive assemblies. The partial threading configuration allows engineers to precisely control engagement depth while maintaining unthreaded shank strength.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance for consistent performance. Features UNC coarse threading (5/16"-18) with right-hand direction and meets applicable ASME/ANSI specifications for dimensional requirements. The black-oxide surface treatment provides corrosion protection while maintaining dimensional integrity. Complies with industry standards for alloy steel fasteners and contains no restricted substances under RoHS and REACH regulations.