When new molds are made, they are based on drawings. After producing a large number of products, there would often be burrs on the nut end face, and the factory continuously repairs the molds, resulting in an increase in the size of the product. However, since the increased size does not affect its use, no improvement has been made.
The new mould is depending on the drawing, the surface of screw nut always be trimming after too many products. So the size he a little expand by the continously repair th mould. Because there is no influence with the size change, so we didn't do the improvement. Many Tks.