Scope

This specification covers metric sheet steel thicknesses and thickness tolerance requirements for engineering

part drawings. This specification is applicable to continuous cast, cold or hot rolled coated, or uncoated steel

substrates specified in GMW2, GMW3032, GMW3399, GMW1 7627, and GMW1 4400 and supplied as coils or

sheet. Thickness tolerances for coated substrates include the specified coating. Additional requirements or

agreements shall be specified by local business units.

Note: Nothing in this standard supercedes applicable laws and regulations.

Note: In the event of conflict between the English and domestic language, the English language shall take

precedence.

1.1 Purpose/Material Description. Not applicable.

1.2 Symbols. Not applicable.

1.3 Applicability. Sheet metal parts consisting of uncoated and metallic coated low carbon and high strength

steel substrates.

1.4 Remarks. Not applicable

3 Requirements

3.1 Physical Requirements. Thickness tolerances for coated substrates include the specified coating. The

specified nominal thicknesses and tolerances for uncoated and coated low carbon and high strength steel sheet

are detailed in Appendix A, Table A1 , Table A2, Table A3, and Table A4. Hot rolled tolerances for GMW3032

HSLA grades shall be used by default, unless otherwise specified elsewhere. The nominal thickness tolerance

is applicable to measurements at any point across the width not < 40 mm from an edge.

For blanks rolled with variable thickness, the tolerance is ± 0.05 mm for all thickness ranges and material grades.

3.1.1 Business regions may decide, in selective instances, to deviate from the tolerances required in this

specification. When this occurs, the specified tolerance on the appropriate GM Release Engineering Drawing

shall take precedence over this specification.

3.2 Additional Requirements. The rounding-off method shall be used when reporting thickness and thickness

tolerances. Reported values shall be rounded to the nearest 0.01 mm and shall utilize the following procedure

in 3.2.1 .

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