What kinds of water stop screws are there and how to calculate them?

Hello, the types of water stop screws can be divided into five categories: old water stop screws, threaded water stop screws, middle tooth water stop screws, three-stage water stop screws and new three-stage water stop screws. The calculation method of these water stop screws is the same, except for the first-class structure and the third-class structure.

Calculation of service length: the service length of the first-stage water stop screw is calculated according to the plate wall width +40 cm, and the service length of the third-stage water stop screw is calculated according to the outer rod fixing 23cm+ the inner rod length (the plate wall width minus the height of a joint nut).

Price calculation: The prices of traditional water stop screws, T3 middle tooth water stop screws and straight thread water stop screws are all calculated in this way. Because it is a stage, the price is composed of screws, water stops and processing fees. The calculation method is: screw length * unit price per meter+water stop+processing fee. Of course, the processing of the through-thread water stop screw will definitely be higher than that of the traditional water stop screw and the middle-tooth water stop screw. The price calculation method of the three-stage water stop screw consists of the outer rod *2, the inner rod * 1, the joint nut *2 and the processing fee. That is, inner rod length * unit price+water stop+outer rod length * unit price *2+ joint nut *2+ processing fee.