The method for calculating steel tubing tolerances invloves the use of linear equations to calculate the eexact tolerance for the tube size desired. The only input data required for the calculation is the OD of the tube. The technique produces a continuous range of tolerances for OD sizes. A series of equations for each condition allows for various methods of heat treatment.
Hot Rolled, Round OD Only
| Selected Size |
As Rolled or Annealed |
Quenched & Tempered or Normalized & Tempered* |
| 2.000 |
±.015 |
±.023 |
| 3.000 |
±.019 |
±.028 |
| 4.000 |
±.023 |
±.035 |
| 5.000 |
±.028 |
±.041 |
| 6.000 |
±.032 |
±.048 |
| 7.000 |
±.037 |
±.055 |
| 8.000 |
±.041 |
±.062 |
| 9.000 |
±.046 |
±.068 |
| 10.000 |
±.050 |
±.075 |
| 11.000 |
±.055 |
±.113 |
| 12.000 |
±.075 |
±.113 |
| *OD & Wall Dimensions Only |
Cold Drawn, Round, OD or ID
| Selected Size |
As Drawn or Tempered |
Annealed |
Quenched & Tempered or Normalized & Tempered* |
Quenched & Tempered or Normalized & Tempered1 |
| 2.000 |
±.004 |
±.007 |
±.010 |
±.015 |
| 3.000 |
±.004 |
±.007 |
±.010 |
±.015 |
| 4.000 |
±.006 |
±.011 |
±.016 |
±.023 |
| 5.000 |
±.009 |
±.015 |
±.021 |
±.032 |
| 6.000 |
±.011 |
±.019 |
±.027 |
±.041 |
| 7.000 |
±.013 |
±.024 |
±.033 |
±.049 |
| 8.000 |
±.015 |
±.028 |
±.039 |
±.058 |
| 9.000 |
±.018 |
±.032 |
±.044 |
±.066 |
| 10.000 |
±.020 |
±.036 |
±.050 |
±.075 |
| *OD & Wall or ID & Wall Dimensions Only |
| 1OD & ID Dimensions Only |
Rotorolled, Round, or OD or ID
| Selected Size |
As Rotorolled |
Tempered |
Quenched & Tempered or Normalized & Tempered* |
Quenched & Tempered or Normalized & Tempered1 |
| 1.500 |
±.005 |
±.011 |
±.010 |
±.016 |
| 2.000 |
±.006 |
±.012 |
±.013 |
±.019 |
| 2.500 |
±.008 |
±.013 |
±.015 |
±.023 |
| 3.000 |
±.009 |
±.014 |
±.018 |
±.026 |
| 3.500 |
±.010 |
±.015 |
±.020 |
±.030 |
| 4.000 |
±.011 |
±.017 |
±.022 |
±.034 |
| 4.500 |
±.012 |
±.018 |
±.025 |
±.037 |
| 5.000 |
±.014 |
±.019 |
±.027 |
±.041 |
| 5.500 |
±.015 |
±.020 |
±.030 |
±.044 |
| *OD & Wall or ID & Wall Dimensions Only |
| 1OD & ID Dimensions Only |