Wing nut is a nut with two wings on both sides, which can be tightened or loosened by fingers. It is widely used in mechanical engineering. Common wing nuts are ASME B18.6.9, DIN314, DIN315, GB62.1. Common materials are carbon steel (A3, Q235) and stainless steel (SS304, SS316). The performance level of wing nuts is usually related to its material and manufacturing process. Common ones are grade 4, grade 5, grade 6, etc. The surface treatments include electroplating, blackening, hot-dip galvanizing, and painting. Haina has a lot of stock for you to choose from, which can meet your various needs.