I lost my wiper nut - anyone know what size?

I mouse proofed under my windshield cowl and sure and shoot lost one of the nuts from my windshield wiper. Can anyone tell me what size they are? It is a black acorn type nut but I am not too concerned with it matching. I found them on Toyota parts but I would rather just puck one up at my local hardware store for $0.30

 

Couldn't you just pull the one you have and take to the hardware store to see what the threads are?

Alleged OEM for $10
90080-17184: Search Result | eBay

Twice that for Sparks..
You'd think they could wrap it in a napkin, stick it in an envelope, and mail it, first class, for $2

 

That would make too much sense as well as being too much effort....

 

Maybe he is afraid of losing that one if he took it off again..

I'd bet $20 I have a nut that would fit on my box full of spare screws, nuts, and bolts..

 

Yeah, you and me both.

 

Same here but it seems like every time I need one I don't have the right one. I told my neighbor the other day that I wish I had a nickle for every nut, bolt, and washer that I will never use.

 

I used the one I have to push both wipers on the splines and the wipers both work. I am being really lazy and hoping to walk into the HW store and pick out the right size. I used to have several loose nuts in cans and containers but I slimmed down on them since I moved.

 

M6 1.0 is the nut size

 

And then there's me, I'm always busting a nut.