S-90291A108 4-40 ASME B18.3 Set Screws
Set Screws
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Basic Information
Head Parameters
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
Installation & Application
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Key Features & Benefits at a Glance
- Superior vibration resistance with durable nylon 6/6 tip that maintains secure fastening under dynamic loads
- Excellent corrosion protection from 18-8 stainless steel construction for long-term reliability in harsh environments
- Precise thread engagement with Class 3A fit ensuring consistent clamping force and reduced loosening
- Easy installation and removal through .050" hex drive design that prevents tool slippage and damage
- Wide temperature compatibility with nylon tip performing reliably from -50° to 250° F
- Maximum holding power through UNC coarse threads providing strong engagement in various materials
- Space-saving headless design allowing flush mounting in confined assembly spaces
Professional Applications & Engineering Value
This 4-40 UNC hex drive set screw delivers exceptional engineering value in applications where vibration resistance and precise positioning are critical. The combination of 18-8 stainless steel construction and nylon 6/6 plastic tip addresses common industrial challenges by preventing component marring while maintaining consistent clamping force. The Class 3A thread fit ensures superior engagement in machinery, automotive assemblies, and electronic enclosures where minute movements can compromise performance. The headless design with hex drive facilitates installation in tight spaces while the right-hand coarse threads provide rapid assembly in production environments. This vibration-resistant solution is particularly valuable in rotating equipment, precision instruments, and automated systems where reliability cannot be compromised.
Specification Summary & Compliance
Manufactured to exacting ASME B18.3 specifications with precision Class 3A thread fit for superior dimensional accuracy. The 4-40 UNC coarse thread configuration ensures reliable performance across industrial applications. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming this set screw meets the latest international standards for restricted substances and chemical safety in industrial components.
