Securing a pcb mount transformer

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I'm considering using a pcb mount 25VA Block flat transformer in a project and I'm currently drawing the package in Eagle.

There are 4 square holes at the corners of this transformer, 2.5mm wide (see picture attached). Am I supposed to use them to secure the transformer to the pcb (and how ?) or are the 8 solder pins sufficient ? A 25VA transformer is 450gr.

Thanks for any insight. :)
 

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The soldered pins will normally be adequate. If the assembly will be shipped or dropped,
there should be pcb mounting bolts near the transformer on at least two sides, to reduce
the chance of board breakage. A thicker pcb for this than usual wouldn't be a bad idea either.
The four square holes are part of the mfg process.
 
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