Control box, Using 250V outlet/plugs as 110V

[t_met]

I'm in the process of making a control box for a RIMs system. I recently got some plugs & receptacles that I'm planning on using as a 110V plug.
http://www.amazon.com/gp/product/B00002NAT2/?tag=skimlinks_replacement-20
http://www.amazon.com/gp/product/B003B8V4E4/?tag=skimlinks_replacement-20
http://www.amazon.com/gp/product/B00002NARX/?tag=skimlinks_replacement-20
http://www.amazon.com/gp/product/B000LEUUZU/?tag=skimlinks_replacement-20

I only got these because I wanted locking and 20amps/30amps.

I wasn't sure if there was a problem with them?

 

[Brumateur]

Sure, 250V rated plugs/receptacles will work fine on 110v .
The only disadvantage of this solution - you can mistakenly connect your 110 V heater to real 240V outlet.