Thanks for the reply, Frank. This issue can be reproduced by adding a spacer between two flanges. I was supprised that the bolt length conversion between metric and imperial is a simply mapping method instead of calculation and round up. In most case, at least in AutoPLANT catalogs, BOLT_INC is set to 6.35 which is not multiple of 5. And it is difficult to control all bolted component are in standard size and no spacer is needed in a project. Thanks, Maggie
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