S-92505A578 5/16"-18 x 1/2" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Superior vibration resistance with Class 3A thread fit ensuring tight, secure fastening in demanding applications
• Exceptional durability and corrosion protection from black oxide alloy steel with Rockwell C45 hardness
• Easy installation and removal with 5/32" hex drive design requiring minimal clearance
• Enhanced gripping power from extended tip design that digs deeper into mating surfaces
• Reliable performance in high-stress environments thanks to coarse UNC thread spacing
• Space-saving headless construction ideal for applications with limited clearance
• Consistent quality assurance with precise tip diameter and length tolerances for uniform performance

Professional Applications & Engineering Value

This 5/16"-18 UNC set screw delivers critical holding power for industrial assemblies where vibration resistance and positional security are paramount. The black oxide alloy steel construction provides excellent corrosion resistance while maintaining Rockwell C45 hardness for long-term durability in harsh environments. The extended tip design creates deeper engagement with shaft collars, pulleys, and gears, preventing slippage under torque loads. With coarse thread spacing and Class 3A thread fit, this hex drive set screw offers superior clamping force for machinery, automotive components, and power transmission systems where reliability cannot be compromised.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with precise Class 3A thread fit tolerances for optimal performance. The screw features 5/16"-18 UNC coarse threads with right-hand orientation and maintains strict dimensional control on tip diameter (0.203" ±0.008") and tip length (0.082" -0.005" to 0"). Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for global industrial applications.