Upgrade your fastening system with this high-quality ESSENTRA / RICHCO part 0400440HN. Made of durable natural nylon, this standard hex nut is designed to fit a thread size of 4-40. With a distance across flats measuring 6.4 mm (0.250 in) and an overall height of 2.5 mm (0.100 in), this hex nut is perfect for a variety of industrial applications where precision and reliability are paramount. Trust ESSENTRA / RICHCO for all your fastening needs.