S-91385A181 3/4"-16 x 3/4" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with nylon patch thread locker prevents loosening under dynamic loads, maintaining secure fastening in high-stress applications
• Superior corrosion protection from black-oxide coating extends service life in demanding industrial environments
• Precise Class 3A thread fit ensures excellent engagement and consistent clamping force for critical assemblies
• High-strength alloy steel construction with Rockwell C45 hardness provides exceptional durability and load-bearing capacity
• Temperature-resistant performance with thread locker effective from -50°F to 250°F for reliable operation in extreme conditions
• Streamlined headless design with hex drive allows for flush installation in confined spaces while enabling high torque application
• Cup tip configuration creates positive seating and improved grip on mating surfaces for enhanced positioning accuracy

Professional Applications & Engineering Value

This black-oxide alloy steel set screw delivers exceptional engineering value in applications requiring permanent, vibration-resistant fastening. The 3/4"-16 UNF fine thread configuration provides superior holding power in precision machinery, while the nylon patch thread locker eliminates the need for secondary locking components in automotive, aerospace, and heavy equipment assemblies. The headless hex drive design enables flush mounting in pulleys, gears, and collars where protruding fasteners are impractical. Engineered to withstand extreme temperature fluctuations from -50°F to 250°F, this set screw maintains its locking integrity in environments where thermal cycling would compromise conventional fasteners, making it ideal for motors, drives, and power transmission systems subject to continuous operation and vibration.

Specification Summary & Compliance

This 3/4"-16 UNF set screw features precision Class 3A thread fit tolerances for superior engagement and meets ASME B18.3 manufacturing specifications. The product complies with RoHS 3 (2015/863/EU) environmental directives and REACH (EC 1907/2006) regulations regarding substance restrictions. Manufactured from alloy steel with Rockwell C45 hardness and black-oxide surface treatment, it ensures reliable performance in industrial applications requiring exacting dimensional standards and environmental compliance.