S-94495A197 4-40 x 1/8" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with nylon patch thread locker maintains secure fastening in dynamic environments from -50° to 250° F
• Superior corrosion protection from black-oxide coating extends service life in demanding industrial conditions
• Precision Class 3A thread fit ensures consistent engagement and reliable performance in critical assemblies
• High-strength alloy steel construction with Rockwell C45 hardness provides exceptional durability and load-bearing capacity
• Compact headless design allows for flush mounting in space-constrained applications
• Standard UNC coarse threading enables quick installation and compatibility with common industrial components
• Hex drive configuration with 0.050" drive size offers secure tool engagement and precise torque application

Professional Applications & Engineering Value

This 4-40 UNC set screw delivers exceptional engineering value for precision industrial applications where space optimization and vibration resistance are critical. The black-oxide alloy steel construction combined with Rockwell C45 hardness ensures reliable performance in demanding environments, while the nylon patch thread locker effectively prevents loosening under continuous vibration and thermal cycling from -50° to 250° F. The headless design and Class 3A thread fit make it ideal for securing collars, gears, and pulleys in machinery, automotive systems, and precision instruments where flush mounting and exact positioning are essential. The coarse UNC threading provides rapid assembly in production environments, reducing installation time while maintaining superior holding power.

Specification Summary & Compliance

This set screw features precision 4-40 UNC coarse threading with Class 3A thread fit for exact dimensional accuracy. Manufactured to ASME B18.3 specifications using high-strength alloy steel with black-oxide surface treatment. The component is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets. The nylon patch thread locking mechanism maintains performance across the specified temperature range of -50° to 250° F.