Generally speaking, the mother screw needs to know the diameter of the mother screw, the diameter and outer diameter of the inner hole, the length of the inner hole, the diameter of the head and the thickness of the head. These need to be reflected in the drawings. When looking for a screw manufacturer to customize the mother and child screws, we must first make a drawing of the screws, whether it is a plan or a 3D drawing.
The manufacturer will calculate the price according to the drawings to measure whether it can be produced and whether it needs to be opened. A female screw needs to be customized, and the dimensions of each part of the screw should be clear. If there is no drawing, you can dictate the dimensions and specifications of each part of the screw.
Extended data
Screwdrivers (screwdrivers) appear around London 1780. Carpenters have found that tightening screws with a screwdriver can fix things better than beating them with a hammer, especially when fine-grained screws are involved.
1797, Maudslay invented the all-metal precision screw lathe in London. The following year, Wilkinson made a nut and bolt making machine in the United States. Both machines can produce universal nuts and bolts. Screws are very popular as fixing parts because a cheap production method has been found at that time.
1836, Henry M. Philips applied for the patent of cross slotted head screw, which marked the great progress of screw basic technology. Different from the traditional slotted head screw, the edge of slotted head screw. This design makes the screwdriver center automatically and is not easy to slide down, so it is very popular. Universal nuts and bolts can connect metal parts together. Therefore, by the19th century, wood used for making machines and building houses can be replaced by metal bolts and nuts.