英寸对照表:
DNinchmmInspiration table
(1 inch brass tube)154National standard thickness 1/2212.75(1 inch brass tube)206分 3/4262.75251333.25
321 1/4423.25
401 1/2483.5
502603.5
652 1/2763.75
803894
10041144
12551404.5
15061654.5
20082196
250102736.78
30012325