Home METALS STAINLESS STEEL ISO Tolerances for Stainless Steel Bar

ISO Tolerances for Stainless Steel Bar

The ISO tolerances shown are taken from ISO 286.

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/- 0.062J = Tolerance divided e.g. 45 mm dia J9 = +/- 0.031K = All Plus tolerance e.g. 45 mm dia K9 = + 0.062 / – 0The K tolerance is usually only applied to larger diameter bars (Over 75mm)

H8 = Precision Ground

H9 = Bright Drawn

H10 = Smooth Turned