Hillman Hex Nut 1/4-20 is designed for general applications and pairs ly with bolts and washers that share the same finish. This versatile and commonly used hex nut is often found in deck and fence building projects, providing reliable fastening. The size designation refers to the inner diameter and the number of threads per inch, also known as the thread pitch. These nuts feature left-handed threading, making them suitable for specific fastening needs. Model Number: