Nuts usually have no front and back sides, but there may be a front and back difference in some special cases.
Basic concepts and usage of nuts
Nuts are a commonly used fastener, usually used with bolts. Its structure is a hollow cylinder with an internal thread in the middle, which can cooperate with the external thread of the bolt, and the bolt can be fixed by rotating the nut. Generally speaking, nuts can be used on both sides, and there is no strict front and back difference.
Front and back difference in special cases
Single-sided nut: This nut has a washer surface on one side, and the washer surface is usually required to face the connected part, so there is a front and back difference.
Double-sided nut: Although the design of both sides is the same, there will be markings on one side, such as the manufacturer's mark and performance grade mark. Usually these marks are printed on the end face, so the two sides of the double-sided nut are not completely consistent.
