I'm no expert on screws, but "M6" is 6mm nominal diameter, so that's 0.236"
versus 0.25" for the "1/4".
On the 28 NF TP versus metric TP issue, I won't venture a guess.
- Bob
Matt Jacquet wrote:
> The M6 and 1/4-28 must have a very close TP and size. The M6 really felt
> right but it was a test fit and process of elimination. I wish I would of
> had the conical point though, it was a "blind" job and took 30min to get one
> of the screws to find its home.
>
> Stan wrote:
> Original headrest attaching screws for 68-70 cars have 1/4-28 NF threads, a
> #3 Phillips recess in a head similar to a pan head and also have a conical
> pointed tip for ease of assembly.
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