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| How to measure a thread.
This guide is assuming you have a car made from 1980's onwards, and thus has a metric thread. There are some cars that are imperial, but most likely you have a metric thread.
You will need:
Something to measure with. A digital caliper is shown, but you can use a micrometer, or a ruler if you have a good eye and common sense.
A set of metric thread pitch gauges. These can be bought on ebay for around £5.
Measure the lever diameter.
You may not get a "round" result, but use your common sense. Typically metric threads are 8mm, 10mm, 12mm, 14mm etc, so this is a 10mm bolt.
Find the thread pitch
Try each blade of the gauge until you find one that fits exactly into the thread ridges. Read off the pitch from the gauge (In this example it's 1.5)
So this bolt is M10 x 1.5 pitch.
Imperial threads are measured in the same way, but the diameter is in fractions of an inch (eg 3/8th's), and you need UNF/UNC thread gauges which are in TPI (eg 16 tpi). |
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