PRU-101Heuristic screen

Hem geometry

Sheet metal

Scope and limits

Hem return flange >= 4 t and closed hems on brittle or thick material.

No standards reference is assigned to this check. The scope described above applies.

Sheet metal · CC0-1.0

Model example

Look at the folded edge of the 1.5 mm sheet: it is folded back 180° with a 2 mm straight return (4.3 mm measured from the outside of the fold).

Dimensions (approx.): 32.283 × 4.6 × 40 mm

Expected check result

PRU-101 should warn that the return is below 4 x 1.5 mm = 6 mm (open hem) and nothing else.

Finding expected

Sheet metal · CC0-1.0

Model example

The same hem with an 8 mm straight return (10.3 mm measured from the outside of the fold), above 4 x 1.5 mm = 6 mm.

Dimensions (approx.): 32.283 × 4.6 × 40 mm

Expected check result

PRU-101 must stay silent: the 8 mm return is above 4 x t.

No finding expected