Nuts are parts that tightly connect mechanical equipment. They are connected by internal threads, and only nuts and bolts of the same specification can be joined together. For example, an M4-P0.7 nut can only be connected to an M4-P0.7 series bolt (in the nut specification, M4 indicates the inner diameter is approximately 4mm, and 0.7 indicates the distance between the two thread teeth is 0.7mm). The same applies to American standard products; for example, a 1/4-20 nut can only be used with a 1/4-20 bolt (1/4 indicates the inner diameter is approximately 0.25 inches, and 20 indicates there are 20 threads per inch).
Stainless steel self-locking nuts, lock nuts, locking nuts, four-prong nuts, screw-in nuts, safety nuts, thin rod screw connecting nuts, self-locking hexagonal cap nuts, special anchor screw nuts, hexagonal crown nuts, and eye nuts.
Welded square nuts, welded hexagonal nuts, locking nuts, embedded round nuts; slotted round nuts, round nuts with side holes, round nuts with end holes, small round nuts; round nuts, ring nuts, wing nuts; copper nuts; copper nuts, inlaid copper nuts, knurled copper nuts, embedded copper nuts, injection molded copper nuts, etc.; alloys; zinc-copper alloy nuts, etc.; anti-loosening principle.