Standard Flatness Tolerance For Sheet Metal

Practical tolerances vary according to the design requirements.

Standard flatness tolerance for sheet metal.

During the rolling process the rollers bow slightly which results in the sheets being thinner on the edges. The resulting bend angle variation and sometimes the required adjustment to the flat layout contributes to the reason that machined parts typical tolerance of 0 002 in can routinely have tighter tolerances than precision sheet metal parts typical tolerance of 0 010 in. T351 t451 t651 t851 t7351 and t7651. As per design requirements and manufacturing capability tolerance class is defined.

Relevant en standards for metal sheets and plates. 5 short span flatness is the deviation from flat over full span for spans 2 ft and less 2 tx51 is a general designation for the following stress relieved tempers. Ati sheet stainless steels are flat rolled products produced by continuous mill rolling available in coils or cut lengths. For sheet metal parts iso 27 68 mk is used.

Sheet metal tolerances should not be tighter than necessary to make the part functional. Thicknesses range from 0 018 to 0 1874 and widths range from 24 to 48. En 10 259 wide strip and plate sheet made of stainless steel. General tolerance iso 2768 does not specify where to use these tolerances.

For thicknesses lighter than 0 018 refer to. Plates can be out of flat for a number of reasons. Geometrical tolerances for features without individual tolerance indications. 1989 general tolerances part 2.

Linear tolerances should be held as loose as possible. Sheet metal guage tolerances. Relevant din standards for metal. Standard tolerances sheet standard tolerances.

4 for widths over 6 ft these tolerances alloy for any 6 ft of total width. Since rolled alloys also levels this product we work to the mill tolerances. And for machined components iso 2768 fh can be used. En 10 029 hot rolled steel plates 3 mm thick or above tolerances on dimensions and shape.

Tolerances of 010 should be considered minimum. Stainless steel sheet forms finishes and tolerances. The tolerances in the table and attachments reflect current manufacturing practices and commercial standards and are not representative of the manufacturer s standard gauge which has no inherent tolerances. In the above example m and k has defined the tolerance.

Flatness tolerance thickness width maximum deviation in in from a horizontal inches inches flat surface in inches 0 062 60 0 40 60 0 50 0 062 60 0 40 60 0 50 stretcher leveled sheets specified to stretcher leveled standard of flatness exclusive of 1 4 2 3 4 and full hard tem pers of 200 and 300 series grades. For sheet metal parts iso 2768 mk is used. And for machined components iso 27 68 fh can be used. Tolerance class is defined as per design requirements and manufacturing capability.

In general sheets 60 wide and under are to be no more than out of flat when laid on a flat surface.