S-91418A583 5/16"-18 x 1" ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating for extended service life in demanding environments
• Exceptional hardness rating of Rockwell C45 ensures minimal wear and deformation under heavy loads
• Precision Class 2A thread fit provides reliable engagement and consistent clamping force
• Extended tip design creates deeper penetration and superior resistance to loosening
• Coarse UNC threading enables faster installation and reduced cross-threading risks
• Square head with external drive allows for high-torque application with standard tools
• Comprehensive compliance with ASTM F912, RoHS 3, and REACH ensures regulatory acceptance

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical performance where vibration resistance and permanent positioning are paramount. The extended tip design bites deeper into shaft materials, preventing rotational slip in pulleys, gears, and collars. The coarse UNC thread form maintains holding power in soft materials while resisting loosening under dynamic loads. With Rockwell C45 hardness, these 5/16"-18 set screws withstand repeated adjustments without thread deformation, making them ideal for industrial machinery, automotive components, and heavy equipment assemblies where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading (5/16"-18). The extended tip features controlled dimensions: 0.078" length (±0.005") and 0.203" diameter (-0.008" to 0). This square head set screw complies with ASTM F912 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring both mechanical performance and regulatory compliance for global industrial applications.