S-91855A680 6-40 Cap Nuts
Cap Nuts
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Basic Information
Dimension Parameters
Thread Parameters
Head Parameters
Material & Strength Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and long-term durability.
- Precise thread engagement with Class 2B fit, ensuring reliable fastening and reducing the risk of cross-threading.
- Fine thread design (UNF 6-40) provides higher tensile strength and better vibration resistance compared to coarse threads.
- External hex drive allows for easy installation and removal with standard tools, improving assembly efficiency.
- RoHS 3 and REACH compliance guarantees environmental safety and meets stringent international regulatory standards.
- Standard cap nut profile offers a finished appearance and protects threads from damage and contamination.
- Compact dimensions (5/16" width, 11/32" height) enable use in space-constrained applications without sacrificing performance.
Professional Applications & Engineering Value
This 6-40 UNF fine thread cap nut is engineered to address critical challenges in industrial assemblies where reliability and corrosion resistance are paramount. The 18-8 stainless steel material provides excellent strength and durability, resisting rust and oxidation in humid or chemical-exposed settings. Its external hex drive design ensures quick, secure fastening with common wrenches, reducing installation time in high-volume production lines. The fine UNF threads deliver superior clamping force and vibration resistance, making these nuts ideal for precision machinery, automotive components, and electronic enclosures. By combining a Class 2B thread fit with a standard cap profile, this nut prevents thread damage and seals out contaminants, enhancing the longevity and safety of your assemblies.
Specification Summary & Compliance
This cap nut features a 6-40 UNF fine thread with Class 2B tolerance for precise fit, right-hand thread direction, and dimensions of 5/16" width and 11/32" height. It is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards for industrial use.
