Tolerances for hot rolled stainless steel bars are included with the general standards for hot rolled steel bars. All of these can be used in conjunction with bars specified to BS EN This article covers round bar tolerances to BS EN , and diameter dimension, ovality, length and straightness.
The data given is not intended to replace that shown in individual standards to which reference should always be made.
Tolerances on diameter cover two levels for either general or precision purposes. Tables in the standard show common specific sizes. These are summarized in the tables below in the range of diameters covered, for guidance only, based on table 1.
Hot rolled round steel bars - Dimensions and tolerances on shape and dimensions (FOREIGN STANDARD)
The standard has a separate table 2 with tolerances for precision applications, such as screws and rivets, based different common specific sizes. This is not covered here. Notes All dimensions are in mm.
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Table 4 of the standard categorises the type of length and notes that it is the purchaser's responsibility to indicate at enquiry and order stages the type of length required and the length range or length required.
No further explanation of the terms used in the standard is given.
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The table below is based on Table 4 of the standard. BS EN specifies methods of measurement for the dimensional tolerances given.
These are summarised below. Straightness is measured as the maximum distance from a flat bed on which the bar rests to the underside of the "hogs back" shape of the bar.
Straightness must be measured over the total length of the bar. Ovality is measured as the difference between the largest and smallest diameters in the same plane perpendicular to the axis of the bar and this must be at least mm from the endo of the bar.
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Tolerances to BS EN for hot rolled round stainless steel bars Introduction Tolerances for hot rolled stainless steel bars are included with the general standards for hot rolled steel bars. Diameter, ovality and straightness dimensions and shape Tolerances on diameter cover two levels for either general or precision purposes.