Best thing is to measure the outside diameter with calipers and go to Sears and spend 5-6 dollars on a some thread gauges to figure out the threads...not trying to be a smart alek, but this way you will be sure.
http://www.sears.com/craftsman-screw...p-00952317000P
http://www.sears.com/craftsman-screw...p-00952316000P
http://www.harborfreight.com/hand-to...ing-tools.html
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