S-91385A583 5/16"-18 x 1" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking: Permanent Nylon Patch thread locker maintains secure fastening even under extreme vibration conditions
• Wide temperature tolerance: Reliable performance across industrial environments from -50°F to 250°F
• Superior corrosion protection: Black-oxide coating on alloy steel provides excellent rust resistance in demanding applications
• Precision thread engagement: Class 3A thread fit ensures tight tolerances and maximum holding strength
• Easy installation and removal: Hex drive design allows for straightforward installation with standard tools
• Space-saving design: Headless construction enables use in confined spaces and flush mounting applications
• Enhanced durability: Rockwell C45 hardness rating provides exceptional wear resistance and long service life

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel set screw delivers critical vibration resistance in demanding industrial applications where loosening under dynamic loads poses significant safety and performance risks. The permanent Nylon Patch thread locker creates a reliable barrier against back-out, eliminating the need for secondary locking mechanisms while maintaining integrity across extreme temperature ranges from -50°F to 250°F. Engineered with Class 3A thread fit and UNC coarse threading, it provides superior engagement in soft materials and faster installation in production environments. The headless design with cup tip ensures maximum contact pressure for securing collars, gears, and pulleys on shafts, making it ideal for power transmission systems, machinery assembly, and precision equipment where space constraints and vibration are constant challenges.

Specification Summary & Compliance

This high-performance set screw features 5/16"-18 UNC coarse threads with precision Class 3A thread fit for optimal engagement and holding power. Manufactured from Rockwell C45 hardened alloy steel with black-oxide surface treatment for corrosion resistance. The fastener complies with ASME B18.3 specifications and ASTM F912 standards, ensuring dimensional accuracy and mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, making it suitable for global industrial applications requiring strict regulatory adherence.