EN 10278 Bright Bar Tolerances

Shape and Size Tolerances
            Dimensional tolerances must be specified by the purchaser at the time of order and determined according to ISO 286-2 as given in Table 1. Unless otherwise specified at the time of ordering, dimensional tolerances should be as stated below:
 
a) Cold Drawn round bars or turned bars: (Table 2) h10,
b) For hexagonal and square cold-drawn bars: acc. to Table 1 and Table 2, h11 for dimensions ≤ 80 mm, h12 for dimensions> 80 mm,
c) For ground products: h9 according to Table 1 and Table 2,
                                                   
Inspection and Tests
  Dimensional inspection should be done as follows:
a) For round bars: At least 150 mm from the end of the bar,
b) For cut length round bars: At a distance of at least 10 mm from the end of the bar,
c) For non-round bars: At least 25 mm from the end of the bar.
                                                   
Linearity Tolerance
  The tolerances specified in Table 3 apply.
                                                   
Length Types and Length Tolerances
  Unless otherwise specified during the order, their lengths and length tolerances should be as specified in Table 4.
                                                   
                                                   
        Operation ISO 286-2’ye Göre Tolerans Sınıfı      
        h6 h7 h8 h9 h10 h11 h12      
        Cold Drawn       R R R, T, H R, T, H      
        Turned       R R R R      
        Grinded R R R R R R R      
        Polished R R R R R R R      
        R= Round, T= Tetragon, H= Hexagon      
        Table -1: Tolerance Class According to the Process Performed      
                                                   
        Nominal Size d (mm) Tolerance Class as per ISO 286-2      
        h6 h7 h8 h9 h10 h11 h12      
        1 < d ≤ 3 +0 / -0,006 +0 / -0,010 +0 / -0,014 +0 / -0,025 +0 / -0,040 +0 / -0,060 +0 / -0,100      
        3 < d ≤ 6 +0 / -0,008 +0 / -0,012 +0 / -0,018 +0 / -0,030 +0 / -0,048 +0 / -0,075 +0 / -0,120      
        6 < d ≤ 10 +0 / -0,009 +0 / -0,015 +0 / -0,022 +0 / -0,036 +0 / -0,058 +0 / -0,090 +0 / -0,150      
        10 < d ≤ 18 +0 / -0,011 +0 / -0,018 +0 / -0,027 +0 / -0,043 +0 / -0,070 +0 / -0,110 +0 / -0,180      
        18 < d ≤ 30 +0 / -0,013 +0 / -0,021 +0 / -0,033 +0 / -0,052 +0 / -0,084 +0 / -0,130 +0 / -0,210      
        30 < d ≤ 50 +0 / -0,016 +0 / -0,025 +0 / -0,039 +0 / -0,062 +0 / -0,100 +0 / -0,160 +0 / -0,250      
        50 < d ≤ 80 +0 / -0,019 +0 / -0,030 +0 / -0,046 +0 / -0,074 +0 / -0,120 +0 / -0,190 +0 / -0,300      
        80 < d ≤ 120 +0 / -0,022 +0 / -0,035 +0 / -0,054 +0 / -0,087 +0 / -0,140 +0 / -0,220 +0 / -0,350      
        120 < d ≤ 180 +0 / -0,025 +0 / -0,040 +0 / -0,063 +0 / -0,100 +0 / -0,160 +0 / -0,250 +0 / -0,400      
        180 < d ≤ 200 +0 / -0,029 +0 / -0,046 +0 / -0,072 +0 / -0,115 +0 / -0,185 +0 / -0,290 +0 / -0,460      
        Table -2: Tolerance Classes      
                                                   
        Product Shape Steel Group Nominal Size Max. Deviation (mm)      
             
        Round < %0,25 C   1,00      
        ≥ 0.25% C, alloy steels, heat treatable steels   1,50      
             
        Stainless Steels, Bearing Steels, Tool Steels   1,00      
             
        Tetragon and Hexagon < %0,25 C d ≤ 75 mm 1,00      
        ≥ 0.25% C, alloy steels, heat treatable steels d ≤ 75 mm 2,00      
             
        Stainless Steels, Bearing Steels, Tool Steels d ≤ 75 mm 1,00      
             
        < %0,25 C d > 75 mm 1,50      
        ≥ 0.25% C, alloy steels, heat treatable steels d > 75 mm 2,50      
             
        Stainless Steels, Bearing Steels, Tool Steels d > 75 mm 1,50      
             
        Table -3: Linearity Tolerance      
                                                   
        Length Type Length (mm) Length Tolerance (mm) Must Be Specified During Order      
             
        Manufacturing Length 3.000 - 9.000* ± 500 Requested Length *      
             
        Supply Length 3,000 * or 6,000 * - 0 / 200 E.g.: 6.000mm      
             
        Cut Length  Up to 9,000 Suitable for specifications within ± 5 tolerance  Length and Tolerance      
             
        * Short Bars: Each pack can contain a certain percentage of short bars.      
             - Dimensions ≤ 25mm: Percentage maximum 5%, lengths of short bars at least two-thirds of the nominal length ordered,      
             
             - Dimensions> 25mm: Percentage maximum 10%, lengths of short bars at least two-thirds of the nominal length ordered,      
             
        When specifically specified at the time of ordering, packages are delivered without short bars.      
        Table -4: Length Types and Length Tolerances      

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