A blade micrometer capable of reading measurements in-between portions of a cast of a larger dimension is used for non-round shape sizing bearings. Again, it's accuracy is measured by the ability of the person using it to be able to apply even pressure for multiple readings.

For non-round shapes and the TAPTITE®1, more inspection is needed with expertise in the field to understand the geometry of the shape(s) in question and full understanding of the relations of the shapes that make up the part to be headed. First Header Die, Inc. does not bid on anything it can not make with distinguished quality. If a customer does not have full understanding of the geometry of the part, the die manufacturer must. It is important to purchase from a company that demonstrates its commitment to quality first. With non-round shape dies, the buyer may not have the ability to distinguish the difference in quality of the dies.

1. TAPTITE is a registered trademark of REMINC. First Header Die, Inc. is a licensed tooling manufacturer for the North American Continent.