Need some info

[Nuclearcricket]

Thanks Don, that pretty much confirms my suspicions as that is very close to what I got with a micrometer on the case I checked. As far as how accurate or how much you trust your calipers that is pretty much an individual thing. I, as a retried toolmaker, have the goodies to be able to check the accuracy of both my mics and my calipers. I have 3 different size vernier calipers and they are quite accurate. I also have digital and dial calipers and they are accurate. The big thing is to be consistent in how you use them. If you have a 1" gage block you can check it with your calipers and depending on how much pressure you use to close your jaws on the block you will get a different reading.
Thanks again
Sam