The table below shows the standard dimensional drill rod tolerance adopted by the US manufacturers. It shows the deviation from a nominal diameter. The diameter tolerance varies by size and whether the nominal diameter dimension is in inches or millimeters.
|0.000 – 0.124″||±.0003″|
|0.125 – 0.499″||±.0005″|
The table below shows the length and straightness tolerances of drill rod as it depend on whether the dimensions are inches or millimeters. The straightness tolerance is reported in T.I.R. which is an abbreviation for total indicator reading.
|36″||+0/+0.125″||±.005″ max T.I.R. per 12″|
|915mm||-0.60/+2.60mm||±.13mm max T.I.R. per 300mm|