Depending upon the application, other dimensional characteristics may be very important to the success of the processing and/or function of the finished product. In these cases, it is important to include tolerances for these other attributes (such as camber, crossbow, etc.).
The measurement technique utilized is critical in achieving correlation of results between supplier and user. If a specific gauge or technique is used for measurement of a particular attribute, it is extremely helpful to pass this information along, so we can be more precise in our measurement of your specified tolerance.