On Thu, 16 Jul 2015 04:57:03 +0000, Volker Borchert wrote:

Steve W. wrote:
Volker Borchert wrote:

In the replacement steering knuckle for an IHC 453 there are two
threaded holes whose thread I can't make out: inner diameter about
10.25 mm and a pitch of 13 TPI [1].

It's a metric thread. That tractor came out of the Neuss factory in
Germany.

That didn't keep them from using UNC. E.g. the bolt that clamps the
steering lever onto the steering knuckle is definitely UNC 1/2" x 13.
(Whereas the steering link clamp bolts are M8x1 and the steering knuckle
top is M27x1.5.)

I think it's M12X2

My wooden rod and thread gauge think it isn't. At least not "x2".
It's definitely 13 TPI.

2mm and 13TPI is only 2.4% different. What sort of wood are you using
that's got the right properties to register threads to that accuracy?

Why don't you just call the parts house, tell them the hole you need to
fill, and ask for the correct fastener?

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