Suction resistance standard rod

The utility model provides a draw resistance standard rod, which comprises a rod body and a plurality of capillary through holes integrally formed in the rod body, the plurality of capillary through holes are parallel to one another, each capillary through hole is parallel to the axis of the rod body, one end face or two end faces of the rod body is/are respectively provided with a chamfer structure, the R value of the chamfer structure is between 0.1 mm and R2 mm, and the diameter of the chamfer structure is smaller than that of the rod body. An airtight layer is arranged on the outer surface of the rod body, the airtight layer is a special inert airtight coating, the airtight layer starts from one end of the rod body, the length of the airtight layer is smaller than or equal to 80 mm, and an etching mark or a printing mark is arranged on the surface of the rod body. The resistance suction standard rod is higher in structural safety, not prone to corner chipping, good in connection air tightness and easy to