干密封管螺纹以美国（美国）管螺纹为基础，但与美国（美国）管螺纹的不同之处在于，干密封管螺纹设计用于密封压力密封接头，而无需使用密封剂。为了实现这一点，需要对螺纹进行一些修改，并提高制造精度。外螺纹和内螺纹的根部被截短的程度略大于波峰，即根部的平面比波峰宽，因此金属对金属的接触发生在波峰和根部与侧面接触重合或之前，见图1。 因此，当螺纹通过扭力组装时，螺纹根部会挤压配合螺纹的尖顶。如果配合螺纹符合标准规范和公差，且不会因装配中的磨损而损坏，则大直径和小直径处的这种密封作用都有助于防止螺旋泄漏，并使接头不需要使用密封剂而具有压力密封性。通过使用适当设计的螺纹工具，可以简化波峰和根部截断的控制。 此外，希望外螺纹和内螺纹都具有L1长度的全螺纹高度。然而，如果功能上没有问题，可以使用兼容的润滑剂或密封剂，以尽量减少磨损的可能性。在制冷和其他系统中组装干密封管螺纹以实现压力密封时，这是可取的。

Dryseal pipe threads are based on the USA (American) pipe thread, however, they differ from the USA (American) pipe thread in that they are designed to seal pressure-tight joints without the necessity of using sealing compounds. To accomplish this some modification of thread from and greater accuracy in manufacture is required. The roots of both the external and internal threads are truncated slightly more than the crests, i.e. roots have wider flats than crest, so that metal-to-metal contact occurs at the crests and roots coincident with or prior to flank contact, see Figure 1. Thus as the threads are assembled by wrenching, the roots of the threads crush the sharper crests of the mating threads.This sealing action at both the major and minor diameters tends to prevent spiral leakage and makes the joints pressure tight without the necessity of using sealing compounds, provided that the mating threads are in accordance with standard specifications and tolerances and are not damaged by galling in assembly. The control of crest and root truncation is simplified by the use of properly designed threading tools. Also, it is desirable that both external and internal threads have full thread height for the L1 length. However, where not functionally objectionable, the use of a compatible lubricant or sealant may be used to minimize the possibility of galling. This is desirable in assembling Dryseal Pipe Threads in refrigeration and other systems to effect a pressure tight seal.