S-91831A006 5-40 Locknuts
Locknuts
Image may differ from product. See technical specification for details.
Basic Information
Dimension Parameters
Thread Parameters
Head Parameters
Material & Strength Parameters
Temperature & Environment Parameters
Finish & Compliance Parameters
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior vibration resistance through nylon insert locking mechanism that maintains secure fastening in high-motion environments
- Excellent corrosion resistance provided by 18-8 stainless steel construction for extended service life in demanding conditions
- High-temperature performance with nylon insert rated to 220°F (104°C) for reliable operation in heated applications
- Precision threading with Class 2B thread fit ensuring consistent engagement and reduced cross-threading risks
- Standard external hex drive design for compatibility with common wrenching tools and straightforward installation
- Coarse UNC thread pattern enabling faster assembly and reduced susceptibility to debris accumulation
- Environmental compliance meeting RoHS 3 and REACH standards for safe use across regulated industries
Professional Applications & Engineering Value
This 5-40 UNC nylon insert locknut delivers critical vibration-resistant performance for industrial applications where secure fastening is paramount. The 18-8 stainless steel construction provides exceptional corrosion resistance, making it ideal for harsh environments including marine, chemical processing, and outdoor equipment. The nylon insert locking mechanism creates consistent friction against mating threads, preventing loosening from machinery vibration, thermal cycling, or dynamic loads. With its 220°F temperature rating and Class 2B thread fit, this locknut maintains reliability in automotive assemblies, electrical enclosures, and manufacturing equipment where temperature fluctuations and precision threading are common concerns. The coarse UNC thread pattern ensures quick installation while resisting clogging in debris-prone applications.
Specification Summary & Compliance
This locknut features 5-40 UNC coarse threads with Class 2B thread fit for precision engagement, measuring 1/4" width across flats and 9/64" height. Manufactured from 18-8 stainless steel with external hex drive and right-hand thread direction. The nylon insert provides reliable locking performance up to 220°F maximum temperature. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards for industrial applications.
