S-94495A243 1/4"-20 x 3/8" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Secure vibration-resistant locking with nylon patch thread locker that maintains performance across a wide temperature range from -70° to 250°F
• Exceptional thread precision with Class 3A fit ensuring reliable engagement and consistent clamping force in demanding applications
• Superior corrosion resistance through black-oxide surface treatment that protects against rust and extends service life
• High-strength durability from alloy steel construction with Rockwell C45 hardness for maximum holding power under heavy loads
• Easy installation and removal with hex drive design providing positive torque transmission and preventing tool slippage
• Space-saving headless design allowing flush mounting in confined spaces while maintaining full thread engagement
• Industry-standard compliance meeting ASME B18.3 specifications for guaranteed interchangeability and performance reliability

Professional Applications & Engineering Value

This 1/4-20 UNC Class 3A set screw delivers critical engineering solutions for industrial applications where vibration resistance and permanent positioning are paramount. The black-oxide alloy steel construction combined with Rockwell C45 hardness ensures exceptional strength for securing gears, pulleys, and collars on shafts in heavy machinery and automotive assemblies. The integrated nylon patch thread locker eliminates the need for separate locking compounds, providing reliable anti-loosening protection in high-vibration environments from manufacturing equipment to aerospace components. The coarse UNC threads facilitate quick installation while maintaining superior holding power, making this hex drive set screw an ideal choice for maintenance-critical applications where downtime prevention is essential.

Specification Summary & Compliance

This set screw features precise 1/4"-20 UNC Class 3A threads with coarse spacing, ensuring optimal engagement and load distribution. Manufactured to ASME B18.3 standards for dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, containing no substances of very high concern. The black-oxide surface treatment on alloy steel substrate provides enhanced corrosion resistance while maintaining the Rockwell C45 hardness required for demanding industrial applications.