S-98190A190 1/4"-20 Cap Nuts
Cap Nuts
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Basic Information
Dimension Parameters
Thread Parameters
Head Parameters
Material & Strength Parameters
Temperature & Environment Parameters
Finish & Compliance Parameters
Cap Parameters
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Key Features & Benefits at a Glance
- Superior vibration resistance through nylon insert locking that maintains secure fastening in high-motion environments
- Enhanced corrosion protection with zinc-plated steel construction for extended service life in demanding conditions
- High-temperature performance with nylon insert rated up to 250°F (121°C) for thermal stability in industrial applications
- Reliable thread engagement with Class 2B UNC coarse threads ensuring consistent installation and removal
- Dual-function design combining locking capability with finished appearance through black nylon cap
- Industry-standard compatibility with external hex drive for easy installation using common tools
- Regulatory compliance meeting REACH and RoHS 3 standards for safe use in regulated industries
Professional Applications & Engineering Value
This Grade 2 zinc-plated steel cap nut with nylon insert locking addresses critical vibration-induced loosening in industrial machinery, automotive assemblies, and electrical enclosures. The 1/4"-20 UNC coarse thread provides excellent engagement in various materials while the nylon insert creates consistent friction locking that outperforms mechanical lock washers. The zinc plating offers sacrificial corrosion protection, extending fastener life in environments with moisture or chemical exposure. With temperature resistance up to 250°F, this external hex drive cap nut maintains locking performance in elevated temperature applications while the black nylon cap provides both aesthetic finish and protection against thread damage.
Specification Summary & Compliance
This 1/4"-20 UNC coarse thread lock nut features Class 2B thread fit for reliable engagement and Grade 2 strength classification. Dimensions include 7/16" width and 31/64" height with 7/32" thread depth. The fastener is manufactured in compliance with REACH (EC 1907/2006) and RoHS 3 (2015/863/EU) regulations, ensuring environmental safety and restricted substance compliance for industrial applications worldwide.
