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Tolerances BS 970 (Pt. 3:1991) for Cold Finished Bars Carbon steels
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SIZE |
millimeters
mm |
deviation
mm |
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Width
Flats
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< 18 |
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0,11 |
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> 18
<
30 |
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0,13 |
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> 30
<
50 |
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0,16 |
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> 50
<
80 |
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0,19 |
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> 80
<
100 |
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0,22 |
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> 100
<
130 |
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0,35 |
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> 130
<
160 |
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1,00 |
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> 160
<
320 |
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2,00 |
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Thickness
Flats
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< 18 |
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0,11 |
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> 18
<
30 |
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0,13 |
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> 30
<
50 |
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0,25 |
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> 50
<
80 |
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0,35 |
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Squares |
> 6 < 18 |
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0,09 |
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> 18
<
30 |
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0,11 |
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> 30
<
50 |
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0,13 |
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> 50
<
80 |
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0,16 |
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> 80
<
105 |
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0,25 |
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Hexagons |
> 6 < 18 |
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0,09 |
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> 18
<
30 |
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0,11 |
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> 30
<
50 |
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0,13 |
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> 50
<
80 |
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0,16 |
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> 80
<
105 |
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0,25 |
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Rounds |
> 6 < 18 |
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0,070 |
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> 18
<
30 |
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0,085 |
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> 30
<
50 |
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0,100 |
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> 50
<
80 |
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0,120 |
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> 80
<
100 |
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0,140 |
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sise tolerances are usually specified as minus |
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Straightness
Tolerances
BS 970
(Pt. 3:1991)
for
Cold Finished
Bars |
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Section |
Steel grade |
Permitted variation |
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mm |
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Rounds |
< 0,25 % carbon
>
0,25 % carbon, alloys and all heat treated grades |
1 / 1000
1 / 500 |
Squares
and
Hexagons |
< 0,25 % cabon
<
75 mm
>
0,25 % carbon, alloys and all heat treated grades |
1 / 750
1 / 500
1 / 375 |
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Flats |
< 0,25 % carbon
>
0,25 % carbon, alloys and all heat treated grades |
1 / 500
1 / 375 |
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Drawn and turned bars shall be supplied to the tolerances shall be measured as maximum deviation from straightness in any 3000 mm portion of the bar. |
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