S-91385A542 1/4"-20 x 1" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with nylon patch thread locker that maintains integrity from -50°F to 250°F, preventing loosening in dynamic applications
• Exceptional durability from black-oxide alloy steel construction with Rockwell C45 hardness for superior wear and corrosion resistance
• Precise installation control through Class 3A thread fit ensuring tight tolerances and reliable seating in mating components
• High torque capability with 1/8" hex drive in headless design allowing flush mounting and maximum driving force application
• Secure component positioning via cup point tip that creates permanent dimples in shafts for positive mechanical locking
• Broad industrial compatibility with UNC coarse threads meeting ASME B18.3 specifications for standardized mounting solutions
• Environmental compliance assurance through RoHS 3 and REACH compliance for global manufacturing applications

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers critical engineering solutions for industrial applications requiring permanent component positioning. The combination of Rockwell C45 hardness and nylon patch thread locker addresses common vibration-induced failure points in machinery, power transmission systems, and precision equipment. The UNC Class 3A thread fit ensures precise engagement with mating components while the cup point design creates permanent seating in shafts and collars. Ideal for securing gears, pulleys, and couplings in manufacturing environments, this headless set screw provides reliable performance where space constraints and vibration resistance are paramount concerns. The temperature-resistant thread locking capability maintains fastener integrity across industrial temperature ranges from sub-zero to high-temperature operations.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with UNC Class 3A thread fit ensuring precision dimensional accuracy. The 1/4"-20 coarse thread with right-hand direction provides standardized mounting compatibility. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting international standards for industrial fastener applications. Thread locker performance certified for temperatures ranging from -50°F to 250°F with nylon patch technology.