S-98886A819 4-40 Hex Nuts
Hex Nuts
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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
- Exceptional high-temperature performance maintains structural integrity from -50°F to 550°F, ideal for demanding thermal environments
- Premium PEEK plastic construction delivers superior chemical resistance and mechanical strength in corrosive applications
- Precision Class 2B thread fit ensures reliable engagement and consistent clamping force in assembly operations
- Standard external hex drive design provides familiar, tool-friendly installation with common wrench sizes
- RoHS 3 and REACH compliance meets stringent international regulatory standards for hazardous substances
- Coarse UNC threading offers excellent resistance to vibration loosening and faster assembly times
- Compact 1/4" width and 3/32" height profile enables space-efficient designs without compromising strength
Professional Applications & Engineering Value
This 4-40 UNC PEEK plastic hex nut delivers critical performance advantages in challenging industrial environments where metal fasteners fail. The PEEK material provides exceptional thermal stability, maintaining mechanical properties across a -50°F to 550°F temperature range while resisting degradation from chemicals, steam, and radiation. The coarse thread design with Class 2B thread fit ensures reliable performance in high-vibration applications common in aerospace, automotive, and electronic enclosures. The external hex drive allows for standard tooling compatibility, streamlining installation in confined spaces. These plastic fasteners eliminate galvanic corrosion concerns when mating with dissimilar metals and provide electrical insulation properties valuable in electronic assemblies and medical equipment.
Specification Summary & Compliance
This inch-system hex nut features 4-40 UNC coarse threads with Class 2B thread fit and right-hand threading. Dimensions include 1/4" width across flats and 3/32" height. Manufactured to standard hex nut profiles, this component is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting current environmental regulations for restricted substances. The PEEK plastic construction ensures consistent dimensional stability and mechanical performance within specified temperature ranges.
