Drill Rod Tolerance

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.

Drill Rod Tolerance Table

Material Type	Diameter	Tolerance
Tool Steel (Annealed)	0.000 – 0.124″	±.0003″
	0.125 – 0.499″	±.0005″
	0.0010″ +	±.0010″

	0-3mm	±.008mm
	4-12mm	±.013mm
	13mm +	±.025mm

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.

Drill Rod Straightness Tolerance Table

Material Type	Length	Tolerance	Straightness
Tool Steel (Annealed)	36″	+0/+0.125″	±.005″ max T.I.R. per 12″
	72″
	144″

	915mm	-0.60/+2.60mm	±.13mm max T.I.R. per 300mm