Center Hole, Metric
|Publication Date:||1 February 2019|
This SAE Metric Aerospace Standard (MA) specifies the drawing requirements for center holes when center holes are required on the finished part.
Center holes make it possible to install a part between bench or machine centers in the process of manufacturing. With such center holes, it is possible to:
a. Achieve center related runout requirements
b. Simplify manufacture and inspection of some revolution generated parts, namely those featuring multiple concentric diameters requiring several machining operations
Dimensional and tolerances in this standard are expressed in millimeters and comply with those for Type A center holes per ISO 866 and Type B center holes per ISO 2540.