Steel Pipe Schedules and Dimensions

The nominal bore is loosely related to the i/d of the pipe, there are different wall thicknesses or schedules available for each size, the o/d stays constant for each NB, the heavier the schedule of pipe the smaller the bore. Here we have both imperial and metric units.

Imperial

Inches
NBDNOD (Inches)Pipe Schedule
SCH 5SCH 10SCH 20SCH 30SCH 40SCH 60SCH 80SCH 100SCH 120SCH 160
3/4201.050.0650.11X0.0950.113XX0.17X0.219
1251.3150.0650.11X0.1140.133XX0.2X0.25
1 1/2401.90.0650.11X0.1250.145XX0.225X0.281
2502.3750.0650.12XX0.154XX0.25X0.344
2 1/2652.8750.0830.12XX0.203XX0.3X0.375
3803.50.0830.12XX0.216XX0.35X0.438
41004.50.0830.12XX0.237XX0.437X0.531
51255.5630.1090.12XX0.258XX0.5X0.625
61506.6250.1090.13XX0.28XX0.562X0.719
82008.6250.1090.150.250.2770.3220.4060.50.5930.7190.906
1025010.750.1340.170.250.3070.3650.50.5940.7180.8431.125
1230012.750.1560.180.250.330.4060.5620.6870.8431.01.312
1435014.00.1560.250.3120.3750.4370.5930.750.9371.0931.406

 

Metric

Millimeters
NBDNOD (mm)Pipe Schedule
SCH 5SCH 10SCH 20SCH 30SCH 40SCH 60SCH 80SCH 100SCH 120SCH 160
3/42026.671.652.11X2.412.87X3.91X4.325.56
12533.401.652.77X2.903.38X4.55X5.086.35
1 1/24048.261.652.77X3.183.68X5.08X5.727.14
25060.321.652.77XX3.91X5.54X6.358.74
2 1/26573.022.113.05XX5.16X7.01X7.629.53
38088.92.113.05XX5.49X7.62X8.8911.13
4100114.32.113.05XX6.02X8.56X11.1013.49
5125141.32.773.4XX6.55X9.53X12.7015.88
6150168.272.773.4XX7.11X10.97X14.2718.26
8200219.072.773.766.357.048.1810.3112.715.0618.2423.01
10250273.053.44.196.357.89.2712.715.0618.2421.4128.58
12300323.853.964.576.358.3810.3114.2717.4521.4125.4033.32
14350355.603.9626.357.9259.52511.1015.0619.0523.8027.7635.71