TOLERANCE

BRIGHT BARS TOLERANCE

BRIGHT STEEL PRODUCT CLASSES TOLERANCES (UNI EN 10278:1999)

Delivery Condition	Tolerance class according to ISO 286-2
Delivery Condition	h7	h8	h9	h10	h11	h12
Cold drawn	-	-	R	R	R-H-S	R-H-S
Turned	-	-	R	R	R	R
Ground	R	R	R	R	R	R

The dimensional tolerance shall be chosen among those allowed in the table

R = Round - H = Hexagon - S = Square

BRIGHT STEEL BARS STANDARD DIMENSION TOLERANCES

	Cold drawn - Round	Cold drawn hexagon - Square	Turned	Ground
DIMENSIONAL TOLERANCES	h10	h11	h10	h9

If not diffrently agreed at time of inquiry and order, the dimension tolerances for bright steel bars shall be in accordance of values provided in table.

Bright Steel Bars Dimension Tolerance (H)

Nominal dimension mm		h7	h8	h9	h10	h11	h12
from	to	h7	h8	h9	h10	h11	h12
1	3	0.010	0.014	0.025	0.040	0.060	0.100
3	6	0.012	0.018	0.030	0.048	0.075	0.120
6	10	0.015	0.022	0.036	0.058	0.090	0.150
10	18	0.018	0.027	0.043	0.070	0.110	0.180
18	30	0.021	0.033	0.052	0.084	0.130	0.210
30	50	0.025	0.039	0.062	0.100	0.160	0.250
50	80	0.030	0.046	0.074	0.120	0.190	0.300
80	120	0.035	0.054	0.087	0.140	0.220	0.350
120	180	0.040	0.063	0.100	0.160	0.250	0.400
180	200	0.046	0.072	0.115	0.185	0.290	0.460

*field not included in EN 10278
For "h" tolerance the dimensions are all below the nominal dimensions. The maximum value corresponds to the nominal dimension, while the field amplitude of tolerance is listed in the table.
Actual dimension of the bar shall be measured at least 150 mm from the end of the bar, in accordance to EN 10278.

Bright Steel Bars Dimension Tolerance (K)

Bar Diameter (mm)	k6	k7	k8	k9	k10	k11	k12
Up to 3	+0.006 /-0.000	+0.010 /-0.000	+0.014 /-0.000	+0.025 /-0.000	+0.040 /-0.000	+0.060 /-0.000	+0.100 /-0.000
Over 3, up to 6	+0.009 /+0.001	+0.013 /+0.001	+0.018 /-0.000	+0.030 /-0.000	+0.048 /-0.000	+0.075 /-0.000	+0.120 /-0.000
Over 6, up to 10	+0.010 /+0.001	+0.016 /+0.001	+0.022 /-0.000	+0.036 /-0.000	+0.058 /-0.000	+0.090 /-0.000	+0.150 /-0.000
Over 10, up to 18	+0.012 /+0.001	+0.019 /+0.001	+0.027 /-0.000	+0.043 /-0.000	+0.070 /-0.000	+0.110 /-0.000	+0.180 /-0.000
Over 18, up to 30	+0.015 /+0.002	+0.023 /+0.002	+0.033 /-0.000	+0.052 /-0.000	+0.084 /-0.000	+0.130 /-0.000	+0.210 /-0.000
Over 30, up to 50	+0.018 /+0.002	+0.027 /+0.002	+0.039 /-0.000	+0.062 /-0.000	+0.100 /-0.000	+0.160 /-0.000	+0.250 /-0.000
Over 50, up to 80	+0.021 /+0.002	+0.032 /+0.002	+0.046 /-0.000	+0.074 /-0.000	+0.120 /-0.000	+0.190 /-0.000	+0.300 /-0.000
Over 80, up to 120	+0.025 /+0.003	+0.038 /+0.003	+0.054 /-0.000	+0.087 /-0.000	+0.140 /-0.000	+0.220 /-0.000	+0.350 /-0.000
Over 120, up to 180	+0.028 /+0.003	+0.043 /+0.003	+0.063 /-0.000	+0.100 /-0.000	+0.160 /-0.000	+0.250 /-0.000	+0.400 /-0.000
Over 180, up to 200	+0.033 /+0.004	+0.050 /+0.004	+0.072 /-0.000	+0.115 /-0.000	+0.185 /-0.000	+0.290 /-0.000	+0.460 /-0.000

Bright Steel Bars Straightness Tolerance

STRAIGHTNESS TOLERANCE COLD DRAWN PRODUCT IN BARS (UNI EN 10278:1999)

Product form	Steel group	Nominal diameter mm	Deviation max mm
ROUNDS	< 0.25%C	-	1.0
	≥ 0.25%C alloy steels quenched and temering steels		1.5
	stainless steels tool steels		1.0
SQUARES AND HEXAGONS	< 0.25%C	d ≤ 75 mm	1.0
	< 0.25%C alloy steels quenched and temering steels		2.0
	stainless steels tool steels		1.0
SQUARES AND HEXAGONS	< 0.25%C	d ≤ 75 mm	1.5
	< 0.25%C alloy steels quenched and temering steels		2.5
	stainless steels tool steels		1.5

Unless otherwise specified, the tolerances of this table will be applied
BRIGHT STEEL BARS OUT-OF-ROUND TOLERANCES (UNI EN 10278:1999)
Maximum deviation from out-of-round shall be no more than half the specified tolerance and in any case never above the upper limit of tolerance.