Why do cross recessed countersunk head screw appear different?

Mr. Pan has ordered cross recessed countersunk head screw from 2 different screw manufacturers, and the sizes given to them are the same.But the screws produced by these two companies are a little different.

Pan from these cross recessed countersunk head screw see, mainly is the groove type is a little different, one of the screw manufacturers of the edge of the cross groove is straight, the center of the cross groove of the other has an arc, is not straight.Pan then asked stone if the two cross-grooves would have any effect on the assembly.

In fact, this in the assembly of the time is not affected, the reason for this situation, mainly because the use of the cross groove punch is different, all cross recessed countersunk head screw cross groove will be different.

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