Odd fastener sizes

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Originally Posted By: Klutch9
Originally Posted By: SHOZ
Both my Hyundai manual transmissions have a very thin head drain plug. Nominally a 23mm but they use a crush washer for sealing and they are hard to remove. The 23mm is way too loose, 15/16"s is much better.


My Kia's transmission drain plug is 24mm. A 15/16" socket actually fits a tad better, oddly. Although sometimes I've seen drain plugs be in an imperial size... like our Fusion, but that is a tapered pipe thread plug. I'm guessing yours is 24mm FWIW.
Yes it is called a 24 mm but that is way too loose for the thin head and you will round it out. Thankfully new ones are under $4.
 
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