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Seamless Mechanical Steel Tube Tolerances

Cold Drawn Round Carbon & Alloy Steel

Diameter Tolerances

OD Size Range, Inches	Wall: Percent of OD	Unannealed Or Stress Relief Annealed				Soft Annealed or Normalized				Oil Quenched & Tempered
		OD Inches		ID Inches		OD Inches		ID Inches		OD & ID
		Plus	Minus	Plus	Minus	Plus	Minus	Plus	Minus	Plus/Minus
Up to 0.499	All	.004	.000			.005	.002			.005
0.500-1.699	All	.005	.000	.000	.005	.007	.002	.002	.007	.007
1.700-2.099	All	.006	.000	.000	.006	.006	.005	.005	.006	.008
2.100-2.499	All	.007	.000	.000	.007	.008	.005	.005	.008	.009
2.500-2.899	All	.008	.000	.000	.008	.009	.005	.005	.009	.010
2.900-3.299	All	.009	.000	.000	.009	.011	.005	.005	.011	.012
3.300-3.699	All	.010	.000	.000	.010	.013	.005	.005	.013	.013
3.700-4.099	All	.011	.000	.000	.011	.013	.007	.010	.010	.014
4.100-4.499	All	.012	.000	.000	.012	.014	.007	.011	.011	.015
4.500-4.899	All	.013	.000	.000	.013	.016	.007	.012	.012	.017
4.900-5.299	All	.014	.000	.000	.014	.018	.007	.013	.013	.018
5.300-5.549	All	.015	.000	.000	.015	.020	.007	.014	.014	.019
5.550-5.999	Under 6	.010	.010	.010	.010	.018	.018	.018	.018	.025
	6 to 7¹/₂	.009	.009	.009	.009	.016	.016	.016	.016	.023
	Over 7¹/₂	.018	.000	.009	.009	.017	.015	.016	.016	.023
6.000-6.499	Under 6	.013	.013	.013	.013	.023	.023	.023	.023	.033
	6 to 7¹/₂	.010	.010	.010	.010	.018	.018	.018	.018	.025
	Over 7¹/₂	.020	.000	.010	.010	.020	.015	.018	.018	.025
6.500-6.999	Under 6	.015	.015	.015	.015	.027	.027	.027	.027	.038
	6 to 7¹/₂	.012	.012	.012	.012	.021	.021	.021	.021	.029
	Over 7¹/₂	.012	.012	.012	.012	.021	.021	.021	.021	.029
7.000-7.499	Under 6	.018	.018	.018	.018	.032	.032	.032	.032	.045
	6 to 7¹/₂	.013	.013	.013	.013	.023	.023	.023	.023	.033
	Over 7¹/₂	.026	.000	.013	.013	.031	.015	.023	.023	.033
7.500-7.999	Under 6	.020	.020	.020	.020	.035	.035	.035	.035	.050
	6 to 7¹/₂	.015	.015	.015	.015	.026	.026	.026	.026	.037
	Over 7¹/₂	.029	.000	.015	.015	.036	.015	.026	.026	.037
8.000-8.499	Under 6	.023	.023	.023	.023	.041	.041	.041	.041	.058
	6 to 7¹/₂	.016	.016	.016	.016	.028	.028	.028	.028	.040
	Over 7¹/₂	.031	.000	.015	.016	.033	.022	.028	.028	.040
8.500-8.999	Under 6	.025	.025	.025	.025	.044	.044	.044	.044	.063
	6 to 7¹/₂	.017	.017	.017	.017	.030	.030	.030	.030	.043
	Over 7¹/₂	.034	.000	.015	.019	.038	.022	.030	.030	.043
9.000-9.499	Under 6	.028	.028	.028	.028	.045	.045	.049	.049	.070
	6 to 7¹/₂	.019	.019	.019	.019	.033	.033	.033	.033	.047
	Over 7¹/₂	.037	.000	.015	.022	.043	.022	.033	.033	.047
9.500-9.999	Under 6	.030	.030	.030	.030	.045	.045	.053	.053	.075
	6 to 7¹/₂	.020	.020	.020	.020	.035	.035	.035	.035	.050
	Over 7¹/₂	.040	.000	.015	.025	.048	.022	.035	.035	.050
10.000-10.999	Under 6	.034	.034	.034	.034	.045	.045	.060	.060	.080
	6 to 7¹/₂	.022	.022	.022	.022	.039	.039	.039	.039	.055
	Over 7¹/₂	.044	.000	.015	.029	.055	.022	.039	.039	.055
11.000-12.000	Under 6	.035	.035	.035	.035	.050	.050	.065	.065
	6 to 7¹/₂	.025	.025	.025	.025	.045	.045	.045	.045
	Over 7¹/₂	.045	.000	.015	.035	.060	.022	.045	.045
Tabulated tolerances can be applied simultaneously to only two of three dimensions, i.e., ODxWall or IDxWall. ID Tolerances apply only to tube specified ODxID or IDxWall...and to dimensions 0.625" and over when ID is at least half the OD. Wall thickness less than 3% of OD, require added ovality tolerances of plus and minus ¹/₂% of mean OD. If water quench and temper is required or specified-refer to Mill for applicable tolerance.

Wall Tolerances

Wall Thickness % of OD	Wall Tolerances Max% Over And Under Normal Wall
Wall Thickness % of OD	ID Under .500"	ID .500" Over
Under 10%	±10.0%	±7.5%
10 to 25%	±10.0%	±6.0%
Over 25%	±12.5%	±7.5%
ASTM-A-519 modified

Straightness Tolerances

Outside Diameter Size Range Inches	Wall Percent Of Outside Diameter	Total Camber In Any 3 Feet
Up to 5.000"	3% OD & Over	.030"
5.001/8.000"	4% OD & Over	.045"
8.001/10.750"	4% OD & Over	.060"
Not applicable to quenched and tempered tubes over 302 BHN

The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other purposes.