S-91385A580 5/16"-18 x 5/8" ASME B18.3, ASTM F912 Set Screws

Key Features & Benefits at a Glance

• Permanent vibration resistance with Nylon Patch thread locker that maintains locking performance from -50°F to 250°F
• Superior corrosion protection through black-oxide coating on alloy steel for extended service life in harsh environments
• Precise thread engagement with Class 3A fit UNC coarse threads ensuring reliable fastening in high-vibration applications
• Maximum torque transmission via 5/32" hex drive design that prevents tool slippage during installation
• Enhanced material strength with Rockwell C45 hardness providing excellent resistance to wear and deformation
• Secure component positioning through cup point design that creates positive locking action on shafts and collars
• Industry compliance assurance meeting ASME B18.3 standards and environmental regulations including RoHS 3 and REACH

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 embedded in the 5/16"-18 UNC coarse threads creates a chemical bond that withstands extreme temperature fluctuations from -50°F to 250°F, eliminating the need for secondary locking mechanisms. The headless hex drive design with 5/32" drive size allows for flush mounting in confined spaces while the cup point tip bites securely into mating surfaces, preventing rotational slippage in power transmission components, machinery collars, and precision assemblies. Engineered to Class 3A thread fit standards, these industrial set screws maintain dimensional accuracy for consistent performance in automotive, aerospace, and heavy equipment applications.

Specification Summary & Compliance

This high-performance set screw features precise 5/16"-18 UNC coarse threads manufactured to Class 3A fit tolerances for superior thread engagement. The component meets ASME B18.3 specifications where applicable and demonstrates full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Manufacturing consistency is ensured through Rockwell C45 hardness certification and dimensional verification of the 5/8" length and 0.313" thread diameter, providing reliable performance in critical fastening applications.