ZHU,

There is nothing in the specification detailing what the edge break should be yet, unfortunately. The engineering drawing call out for edge break always takes precedence over any specification.

However I have seen an alarming trend whereas the engineering drawing range will not yield and acceptable part after shot peen. Example: UOS all edges are to be broken .003-.015". While an edge broken to .003" would meet drawing requirements, the edge would almost certainly roll at any "A" scale intensity. Whereas if the edge was broken .010-.015" you would just about 100% guarantee that there would be no edge roll. My suggestion for peened parts would be to always put as close to the largest edge break allowed by the drawing. Waiting for this to be addressed by the specification could take years if ever.