| Compare: inner diameter
The dimension corresponding to the smallest diameter measurement possible of an external feature or shaft width of a part. Generally used with respect to piping, in which it is the diamter of the tube as witnessed by the outside world. This can be quite a bit different than the inner diameter, for thick pipes. This is important to keep in mind when designing or purchasing reducers/enlargers to change one size of pipe to another. Also, in the US, piping is usually sold by its O.D. measurement, +/- an arbitrary amount.
|<--------- O.D. --------->|
| |
| |
| | | |
| |<------ I.D. ------>| |
| | | |
| | | |
| | +22222222222 | |
| |0UHMMUUU0222UUUHMMUU| |
|+H|H0+ 2U|M0|
+MM| |MMU
MMMMU2 +0|MMM
MMHHMMMUUU222222220UUHMMMHMM
MM0 +20UHMMMMMMMMMMMUU22 0MM
MM0 0MM
MM0 0MM
MM0 0MM
MM0 0MM
MM0 0MM
MM0 0MM
MM0 0MM
MM0 +222220MM
MM0 0HMMNHNNMMM
UMU 0MMN#QQQQQQHM
2MMH2 2HMH$0QQQQQQQQ$
0HMMH02220HMH$ +$2002
+20UMMMMU2
| 
