What size wing nut do I need for ...

[neilbardsley]

The filter nut on the top of my Weber 40 off kn filters I think. I bought some m6 which looked about the right size but they will not turn on!



Perhaps I'm being stupid and should of just got some m8s too

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[fetuhoe]

They are much more likely to be Imperial as they are US made.

The typical Acorn Nut on a K&N is typically a #10-24 which is a UNC but this is only around 5mm diameter on the major thread diameter.

Can you measure the major diameter of the thread on the filters ? as the single wing nut is likely to be larger but still UNC.

[smallspeed]

got a feeling the ones on our midget were 5/16-UNF when we replaced them, but might be the same.. 5/16 would be around 8mm I guess so if the M6 is too small it might be that size too

[neilbardsley]

Well it's not a 1/4 inch either!!

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[911hillclimber]

The nuts that hold the rain guards on are 1/4 unf on my KN filters bought about 7 years ago.