On 16/07/15 06:31, Tim Wescott wrote:
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?

I thought that little difference would be difficult to discern but I've
just been measuring the nose thread on a hydraulic ram with thread
gauges and it is 2mm, 13TPI was the closest inch pitch but the
difference in fit was easy to discern. The 2mm pitch gauge was spot on
and the 13TPI didn't quite fit right, whether the wood plug approach
would give the same sort of result in clearly differentiating between
the 2 I don't know.