ISO Tolerances

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The tolerances shown in this table are normally applied to metric sizes of drawn, turned and ground finish bright steel bars.

Tolerances in millimetres.

The total tolerance is taken under.

Nominal Sizes (mm)	h11	h10	h9	h8	h7
1 to 3	0.060	0.040	0.025	0.014	0.010
3 to 6	0.075	0.048	0.030	0.018	0.012
6 to 10	0.090	0.058	0.036	0.022	0.015
10 to 18	0.110	0.070	0.043	0.027	0.018
18 to 30	0.130	0.084	0.052	0.033	0.021
30 to 50	0.160	0.100	0.062	0.039	0.025
50 to 80	0.190	0.120	0.074	0.046	0.030
80 to 120	0.220	0.140	0.087	0.054	0.035
120 to 180	0.250	0.160	0.100	0.063	0.040

The tolerances shown in this table are normally applied to imperial sizes of drawn, turned and ground finish bright steel bars.

Tolerances in Inches.

The total tolerance is taken under.

Nominal Sizes (inch)	h11	h10	h9	h8	h7
³⁄₆₄ to ¹⁄₈	0.00240	0.00157	0.00098	0.00055	0.00039
¹⁄₈ to ¹⁵⁄₆₄	0.00295	0.00189	0.00118	0.00071	0.00047
¹⁵⁄₆₄ to ¹⁄₆₄	0.00354	0.00228	0.00142	0.00087	0.00059
²⁵⁄₆₄ to ⁴⁵⁄₆₄	0.00433	0.00275	0.00169	0.00106	0.00071
⁴⁵⁄₆₄ to 1³⁄₁₆	0.00511	0.00331	0.00205	0.00130	0.00082
1³⁄₁₆ to 2	0.00629	0.00393	0.00244	0.00153	0.00098
2 to 3¹⁄₈	0.00748	0.00474	0.00291	0.00181	0.00118
3¹⁄₈ to 4	0.00866	0.00551	0.00342	0.00213	0.00137
4 to 7³⁄₃₂	0.00984	0.00629	0.00393	0.00248	0.00157