Use the table below for converting from metric to imperial and vice versa for items like tubing, union, and column coupler dimensions.

Metric Imperial
0.13 mm = 0.005 inches
0.18 mm = 0.007 inches
0.25 mm = 0.010 inches
0.30 mm = 0.012 inches
0.40 mm = 0.016 inches
0.50 mm = 0.020 inches
0.75 mm = 0.030 inches
0.80 mm = 0.031 inches
1.0 mm = 0.040 inches
1.5 mm = 0.060 inches