Why won't the bolts from bed fit M6 barrel nuts?

11 Jul 2022
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United Kingdom

We have a wooden bed for our son and lost some of the barrel nuts. I purchased M6 ones and the bolt is too big. Must be M8 i thought, nope bolt is way too small. From my google search, M7 barrel nuts don't seem to exist. When i measure the thread from side to side i'm getting 6mm.

Anyone any idea what's going on here? I feel like the bed manufacturer has done this on purpose lol
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May be they have made and used there own size. Are you certain it is a metric sized bolt.
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Could it be m6 but with a fine thread pitch? I've seen that before on furniture.

You can buy thread pitch measures, but might be easier to take the bolts to a fixings supplier to get nuts that fit, or get new bolts.
For most metric screws there are at least two pitches (coarse and fine), sometimes more. Alternatively, it might be a UNC or UNF bolt (i.e. American spec). Nobody makes their own threads these days
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Or just count the number of threads per inch length of bolt, or half it if only half an inch long etc. The number of threads per inch (TPA) will tell you the type of thread.

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