This is an MAIN ARMATURE BEARING for SA-200. Fits most Red Face and Short Hood welders and some Black Face welders. There are two different bearing that were used and this is the larger of the two.
The Outstide Diameter of this Bearing is approximately 3.54 inches (a little under 3 9/16 inches).
If your bearing is smaller then check out this bearing.
Please call with any questions 602-850-7399.