DIY thread tap when your in a bind.

[jerseykat1]

I made a DIY thread tap today because i didn't have the correct size tap and it worked perfectly!

 

[454ragtop]

Good video, I've done that before myself. One thing though, you show a 3/8-16 bolt to rethread a 12MM hole, won't work, 3/8 is smaller. Gonna guess you probably actually used 1/2-13.
Jim

 

[rsanter]

I did that many times back before I had a thread chaser set.
Depending on how you do,your slots you can make it work a couple of ways.
One way you grind it, it will help,to,reform the threads like a chaser does.
But you can also grind it with more of an edge like a tap to clean out gunked up,threads.

To make it work,properly. Or the best it can. You need to,use a minimum of a grade8 bolt but better you can use an Allen bolt as they have more case hardness to them

Bob

 

[jerseykat1]

Good video, I've done that before myself. One thing though, you show a 3/8-16 bolt to rethread a 12MM hole, won't work, 3/8 is smaller. Gonna guess you probably actually used 1/2-13.
Jim

Yeah i missed the fact that they were in the wrong packaging.

 

[jerseykat1]

I did that many times back before I had a thread chaser set.
Depending on how you do,your slots you can make it work a couple of ways.
One way you grind it, it will help,to,reform the threads like a chaser does.
But you can also grind it with more of an edge like a tap to clean out gunked up,threads.

To make it work,properly. Or the best it can. You need to,use a minimum of a grade 8 bolt but better you can use an Allen bolt as they have more case hardness to them

Bob

great advice using the Allen bolts.

 

[ngk22r]

The best option is to install a time sert for the aluminum oil of a Handa and can be installed without taking off the oil pan.

Your method is good as a temporary fix to get the person down the road. Overtime the new bolt will end up failing and even with a washer will start to form a drip and then the hole will wear out.