Eh... I'd check it to be on the safe side.
http://www.tsa.gov/travelers/airtrav...ted-items.shtm
http://contact.tsa.dhs.gov/mytsa/cib...ch=power+tools
Technically (thanks the ambiguity of the words

) it would be considered a tool... and most likely over 7 inches.
Save yourself the hassle and check it.