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Tolerances for hot rolled stainless steel bars are included with the general standards for hot rolled steel bars. The various sections are covered by:-

BS EN 10058 – Flat bars

BS EN 10059 – Square bars

BS EN 10060 – Round bars

BS EN 10061 – Hexagon bars

All of these can be used in conjunction with bars specified to BS EN 10088-3. This article covers flat bar tolerances to BS EN 10058, and covers thickness, width, length, straightness and ‘out-of-section’.

*The data given is not intended to replace that shown in individual standards to which reference should always be made.*

Dimensions and tolerances for stainless steel long products are covered in more detail in the BSSA special report ‘A Specifiers Guide to the New EN Standards for Stainless Steel Long Products’ available in the publications area of the web site.

The table below, based on Table 2 of the standard, summarises width, thickness, straightness and ‘out-of-section’ deviations.

Width (b) | Nominal width | Limit deviation |
---|---|---|

– | between 10 and 40 | +/- 0.75 |

– | over 40 up to 80 | +/- 1 |

– | over 80 up to 100 | +/- 1.5 |

– | over 100 up to 120 | +/- 2 |

– | over 120 up to 150 | +/- 2.5 |

Thickness (t) | Nominal thickness | Limit deviation |

– | up to 20 | +/- 0.5 |

– | over 20 up to 40 | +/- 1 |

– | over 40 up to 80 | +/- 1.5 |

Straightness (q) | Nominal cross-section | Tolerance in the plane |

– | below 1000 mm2 | below 0.4% of measuring length |

– | 1000 mm2 and above | below 0.25% of measuring length |

Out-of-section (u) | Nominal thickness | Tolerance |

– | between 10 and 25 | 0.5 |

– | over 25 up to 40 | 1 |

– | over 40 up to 80 | 1.5 |

Notes

All dimensions are in mm.

If agreed at the enquiry and order stage, limit deviations (ranges) can be all plus, minus zero, rather than equal plus / minus.

The standard states ‘Depending on the type of length, flat bars shall be cut to lengths within tolerances given in Table 3’. Table 3 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. The table below, is based on Table 3 of the standard.

Type of length | Range | Limit deviation |
---|---|---|

Manufacturing length (M) | 3000 to 13000 with a range of 2000 per order item | 10% of bars may be below the minimum for the ordered range, but not less than 75% of the minimum of the range |

Fixed length (F) | 3000 to 13000 | +/- 100 |

Exact length (E) | below 6000 | +/- 25 |

– | between 6000 and 13000 | +/- 50 |

Notes

All dimensions are in mm.

If agreed at the enquiry and order stage, limit deviations (ranges) can be all plus, minus zero, rather than equal plus / minus.

BS EN 10058 specifies methods of measurement for the dimensional tolerances given. These are summarised below.

**Width and thickness**

**Straightness**

**Out-of-section**

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