"David Billington" wrote in message
...
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.

Try pressing solder against the threads, and see if the pitch of the
indentations matches the gauge.