very close 40 thou is 1.016mm
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That is 40 thousandths of an inch and is approximately equal to 1 millimeter, or slightly more than 1/32 inch.
There are 0.0393701 thousandths of an inch in a millimeter.
To convert thousandths of an inch to millimeters, you can multiply the measurement in thousandths of an inch by 0.0254. This conversion factor accounts for the difference in the unit sizes between inches and millimeters.
There are 25.4 thousandths of an inch in 1 cm.
25.4 mm = 1 inch