Interesting . MY tap set has all 8 of the pitches in Pierre's
list below , that set only goes up to 12 mm .? It ca,e to be @ my
first motorcycle which is right @ that time frame . I can look at
just about any SAE bolt & tell ya what pitch it is , I look at
a metric & I'm lost .
thanks
animal
On 7/27/24 3:28 AM, Pierre-Raymond
Rondelle via groups.io wrote:
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Metric pitches have changed around 1968 / 1968:
Dia??? old pitch ? ??? current pitch
3mm??? 0.6mm??? ??? ??? 0.50mm
3.5mm 0.7mm??? ??? ??? 0.6mm
4mm??? 0.75mm?? ?????? 0.70mm
5mm??? 0.9mm??????????? 0.8mm
above they didn't change.
On 26.07.24 06:57, Johannes via
groups.io wrote:
Thanks for all the tips.
I put a big
"toothpick" into the hole and twisted, and the best I found
was 0,6+ pitch on a ca 3 mm hole, and do to the big .xls from
Kerry , a 1/8 is very close, and it will be tested out
tomorrow. As you can see from the picture, it is a very short
hole. So, 55 or 60 deg is not so important.
There are
some restorations on YouTube , and I will try to contact them
for a picture of the head of the screw.
Johannes
Mexico
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