ISO Tolerances for Stainless Steel Bar

Tolerances in mm for Given Tolerance Number

Diameters (mm)	6	7	8	9	10	11	12	13
Diameters (mm)	6	7	8	9	10	11	12	13
>1 ≤ 3	0.007	0.009	0.014	0.025	0.040	0.060	0.090	0.140
>3 ≤ 6	0.008	0.012	0.018	0.030	0.048	0.075	0.120	0.180
>6 ≤ 10	0.009	0.015	0.022	0.036	0.058	0.090	0.150	0.220
>10 ≤ 18	0.011	0.018	0.027	0.043	0.070	0.110	0.180	0.270
>18 ≤ 30	0.013	0.021	0.033	0.052	0.084	0.130	0.210	0.330
>30 ≤ 50	0.016	0.025	0.039	0.062	0.100	0.160	0.250	0.390
>50 ≤ 80	0.019		0.046	0.074	0.120	0.190	0.300	0.460
>80 ≤ 120	0.022			0.087	0.140	0.220	0.350	0.540
>120 ≤ 180	0.025			0.100	0.160	0.250	0.400	0.630
>180 ≤ 250				0.115	0.185	0.290	0.460	0.720
>250 ≤ 315						0.320	0.520	0.810
>315 ≤ 400						0.360	0.570	0.890
>400 ≤ 500						0.400	0.630	0.970
>500						0.440	0.700	1.100

EXAMPLES

H = All Minus tolerance e.g. 45 mm dia H9 = + 0/- 0.062

J = Tolerance divided e.g. 45 mm dia J9 = +/- 0.031

K = All Plus tolerance e.g. 45 mm dia K9 = + 0.062 / - 0
The K tolerance is usually only applied to larger diameter bars (Over 75mm)

H8 = Precision Ground

H9 = Bright Drawn

H10 = Smooth Turned

ISO Tolerances for Stainless Steel Bar

Tolerances in mm for Given Tolerance Number

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