Threaded Nuts - 1/4-20 UNC 

A 1/4-20 UNC threaded nut is a type of fastening device consisting of a square or hexagonal block, usually of metal, with a hole in the centre having internal, or female, 1/4-20 UNC Thread. Grand Brass Lamp Parts has a large selection of 1/4-20 UNC Threaded Nuts available with Hex Head, Round, Pal, or Wing Nuts in Solid Brass or Steel. For Common Questions about Measuring Lamp Thread click here