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Posted by: patssle Feb 13 2016, 02:09 PM

I need to thread tap my bumpers (M12 1.5) to clean out the rust. Is there a socket or extension that works with these? I did the rear bumper with a 8mm socket but it's slipping on the front bumper not being a perfect fit and as the rust is a little tougher.

If very much possible without spending $40 on a socket set that I'll never use again!

Thanks!

Posted by: Darren C Feb 13 2016, 02:18 PM

You need a basic collet tap wrench like this...

http://www.ebay.com/itm/T-Handle-Tap-Wrench-Chuck-Type-Capacity-M3-M12-Adjustable-Hand-Tool-/262197673282?var=&hash=item3d0c32fd42:m:me7p688XbGHrGjRsggj3NWA

Should be able to get one from any good tool store.

If not at worst you could use a small adjustable spanner wrench.

Posted by: Wyvern Feb 13 2016, 02:25 PM

I have had really good luck just going to the hardware store and buying a long(er) grade 8 bolt and cutting 2 grooves in it using a cut off grinder or even a hacksaw, and using as a cleaner / chaser .
Good lube, and screw in then back out (clean if needed) the repeat.

Posted by: zipedadoo Feb 13 2016, 02:30 PM

What I usually do is find a nut that's a little smaller than the square drive of the tap, hammer it on and use a 1/4 drive ratchet/socket to turn it. A little crude but it works.

Posted by: The Cabinetmaker Feb 13 2016, 04:19 PM

You'll do better with a thread chase, not a tap. A tap will cut the threads a little larger making a loose fitting bolt.

Posted by: patssle Feb 14 2016, 07:10 PM

This worked! I actually used the same style nut that goes on the clutch pulley. It fit perfect.



Unfortunately you need an extension to get into the late model bumper threads.