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Maryland Metrics: Technical Data Chart
Metric Conduit Trade Size Designators

This is NOT true metric sized conduit.
It is just the USA way to put a Metric designation onto USA trade sized (inch) conduit.

Data from: Steel Tube Institute of North America
 
Table 1: Metric Trade Size Designators
For RMC, IMC and EMT conduit
  *Trade Size
Designator
English (inch) Metric (mm)
1/2 16
3/4 21
1 27
1 1/4 35
1 1/2 41
2 53
2 1/2 63
3 78
3 1/2 91
4 103
5 129
6 155
* Identifier only; not an actual dimension
Rigid metal conduit RMC (ferrous metal)
Intermediate metal conduit - IMC (ferrous metal)
Electrical metallic tubing - EMT (ferrous metal)


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