Stainless steel bright bars · Size & tolerance table

Bright bar tolerances h6 to h13 (ISO 286-2)

Standard: ISO 286-2 · EN 10278 (bright bar tolerances)

Bright bars are ordered to an ISO tolerance class. An "h" tolerance means the bar is never over the nominal size: the upper deviation is zero and the lower deviation is the figure shown. The usual classes for stainless bright bar are h9 for cold-drawn rounds, hexagons and squares, h10–h11 for peeled (turned) rounds, h11 for large drawn sizes, and h6–h8 for centreless-ground bars for shafts and pump spindles.

EN 10278 sets which classes are available for each kind of bright product; ISO 286-2 gives the values.

Permitted deviation from nominal size (mm)

Size mm	h6 mm	h7 mm	h8 mm	h9 mm	h10 mm	h11 mm	h12 mm	h13 mm
up to 3	0 / −0.006	0 / −0.01	0 / −0.014	0 / −0.025	0 / −0.04	0 / −0.06	0 / −0.1	0 / −0.14
over 3 to 6	0 / −0.008	0 / −0.012	0 / −0.018	0 / −0.03	0 / −0.048	0 / −0.075	0 / −0.12	0 / −0.18
over 6 to 10	0 / −0.009	0 / −0.015	0 / −0.022	0 / −0.036	0 / −0.058	0 / −0.09	0 / −0.15	0 / −0.22
over 10 to 18	0 / −0.011	0 / −0.018	0 / −0.027	0 / −0.043	0 / −0.07	0 / −0.11	0 / −0.18	0 / −0.27
over 18 to 30	0 / −0.013	0 / −0.021	0 / −0.033	0 / −0.052	0 / −0.084	0 / −0.13	0 / −0.21	0 / −0.33
over 30 to 50	0 / −0.016	0 / −0.025	0 / −0.039	0 / −0.062	0 / −0.1	0 / −0.16	0 / −0.25	0 / −0.39
over 50 to 80	0 / −0.019	0 / −0.03	0 / −0.046	0 / −0.074	0 / −0.12	0 / −0.19	0 / −0.3	0 / −0.46
over 80 to 120	0 / −0.022	0 / −0.035	0 / −0.054	0 / −0.087	0 / −0.14	0 / −0.22	0 / −0.35	0 / −0.54
over 120 to 180	0 / −0.025	0 / −0.04	0 / −0.063	0 / −0.1	0 / −0.16	0 / −0.25	0 / −0.4	0 / −0.63
over 180 to 250	0 / −0.029	0 / −0.046	0 / −0.072	0 / −0.115	0 / −0.185	0 / −0.29	0 / −0.46	0 / −0.72

Notes

Example: a 25 mm h9 bar may measure between 25.000 and 24.948 mm.
Hexagons and squares are measured across flats; their corners are not toleranced by this table.