S-90251A578 5/16"-18 x 1/2" ASME B18.3 Set Screws
Set Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior vibration resistance with permanent nylon patch thread locker that maintains locking performance from -50° to 250°F
- Excellent corrosion resistance through 18-8 stainless steel construction for extended service life in harsh environments
- Precise thread engagement with Class 3A fit UNC coarse threads ensuring reliable fastening in demanding applications
- Secure installation and removal via hex drive design with 5/32" drive size for consistent torque application
- Enhanced material durability with Rockwell B80 hardness providing optimal strength without brittleness
- Effective positioning and locking through cup tip design that creates positive seating on shaft surfaces
- Industry-standard compliance meeting ASME B18.3 specifications for guaranteed dimensional accuracy
Professional Applications & Engineering Value
This 18-8 stainless steel set screw delivers critical vibration resistance in industrial machinery, automotive components, and precision equipment where permanent locking capability is essential. The nylon patch thread locker eliminates the need for secondary locking devices while maintaining performance across extreme temperature ranges (-50° to 250°F). Engineered with UNC coarse threads and Class 3A fit, this hex headless set screw provides superior holding power in high-vibration environments where traditional fasteners might loosen. The cup tip design ensures positive contact on shaft surfaces, making it ideal for permanent positioning applications in pulleys, gears, and collars.
Specification Summary & Compliance
Manufactured to ASME B18.3 standards with precise Class 3A thread fit for optimal engagement. Features 5/16"-18 UNC coarse threads with right-hand direction and 1/2" length. The hex drive accommodates standard 5/32" tools for consistent installation. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
