S-91831A005 4-40 Locknuts
Locknuts
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Basic Information
Dimension Parameters
Thread Parameters
Head Parameters
Material & Strength Parameters
Temperature & Environment Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Vibration-resistant locking through durable nylon insert that maintains secure fastening in dynamic applications
- Superior corrosion resistance with 18-8 stainless steel construction for long-lasting performance in harsh environments
- Reliable high-temperature performance with nylon insert rated for continuous service up to 220°F
- Precision thread engagement with Class 2B thread fit ensuring consistent, reliable installation
- Easy installation and removal with standard external hex drive design for common tool compatibility
- Coarse thread advantage with UNC threading providing faster assembly and reduced cross-threading risk
- Environmental compliance assurance meeting RoHS 3 and REACH standards for global market acceptance
Professional Applications & Engineering Value
This 4-40 UNC nylon insert locknut delivers critical vibration resistance in demanding industrial applications where loosening under dynamic loads poses significant reliability concerns. The 18-8 stainless steel construction provides essential corrosion resistance for equipment exposed to moisture, chemicals, or outdoor elements, while the nylon insert locking mechanism creates consistent friction against mating threads without damaging components. Engineered with Class 2B thread fit and coarse UNC threading, this external hex locknut ensures rapid installation in production environments and maintains integrity in assemblies subject to thermal cycling up to 220°F. Ideal for machinery, electrical enclosures, and transportation equipment where vibration-induced failure must be prevented.
Specification Summary & Compliance
This locknut features 4-40 UNC coarse threads with Class 2B thread fit precision, standard 1/4" hex width and 9/64" height dimensions. Manufactured to industry standards for external hex drive locknuts with right-hand threading. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and global market acceptance.
