Sheet Metal Flatness Tolerance Standard

Unfortunately the reality is quite different and the standard commercial specifications to which these products are produced recognize this reality.

Sheet metal flatness tolerance standard.

Thicknesses range from 0 018 to 0 1874 and widths range from 24 to 48. Table 3 1 shown the unspecified sheet metal tolerance. The tolerance for all thicknesses and all sizes is 1 16 inch 0625 per 6 inches of width or fraction thereof. 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.

Practical tolerances vary according to the design requirements. Linear tolerances should be held as loose as possible. In the above example m and k has defined the tolerance class. Ati sheet stainless steels are flat rolled products produced by continuous mill rolling available in coils or cut lengths.

Critical dimensions tolerance is calculated using tolerance stackup analysis. Tolerances of 010 should be considered minimum. Standard astm mill toleranes flatness hot dipped metallic oated sheet cut lengths over 12 in width specified to tenion leveled standard of flatness astm 924 97a specified minimum thickness inch over 019 thru 032 incl. Tight tolerances raise the cost of manufacturing significantly.

Sheet metal guage tolerances. Only short span flatness tolerance applies short span flatness 5 tolerance 6 in. For edge to edge hole to hole edge to hole tolerances shall be taken from column a. The requirements on the flatness of the plate and sheet products sold by rolled alloys vary considerably by the type of product by alloy by thickness and by the size of the piece.

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. Allowable deviation from flat tx51 tempers 2 aluminum technical data sheet and plate flatness tolerances flatness tolerances flat sheet 1 alloy includes alclads specified thickness in. And for machined components iso 27 68 fh can be used. During the rolling process the rollers bow slightly which results in the sheets being thinner on the edges.

For sheet metal parts iso 27 68 mk is used. Sheet metal tolerances should not be tighter than necessary to make the part functional. For thicknesses lighter than 0 018 refer. Sheet standard tolerances.