I came across an odd shaped bolt in my rusty collection and am wondering if anybody knows its extra purpose other than being just a bolt. The threaded shank is not round but hexagon shaped like an allen/hex wrench from bottom to head. It has a 9/16 wrench head with built on washer-lip & the shank is about 5/16 X 2&3/4 in length. I have seen a lot of odd bolts but never one like this. It works great as a thread cleaner for ID threads & nuts. Oh, The top of bolt head has NL embossed in center top.
Just curious if the many different tradesmen on this board has a clue.