Schedule 10 vs Schedule 40

The schedule number on pipe products relates to the thickness of the wall on the pipe: as the number increases, the thicker the wall thickness becomes. Also, while the schedule number can be the same on different sized pipes, the actual wall thickness will be different. 

  Wall Thickness
SizeODSch 10Sch 40
1-1/2″1.9000.1090.145
2″2.3750.1090.154
3″3.5000.1200.216
4″4.5000.1200.237
6″6.6250.1340.280
8″8.6250.1480.322
10″10.7500.1650.365
12″12.7500.1800.406