Anybody make a m5x0.8 rethreading tap and die?

[mikey03]

I searched the forums and found names of some companies that make these retreading tools like lang and jawco but I cant find any m5 x 0.8

if it doesn’t exist how bad an idea is it to use a regular tap and die and just be real careful and go slow?

tbh I haven’t needed one yet but I been using my lang set a lot lately and it’s saving my **** at least once every few weeks and I was looking at the sizes it might be missing that I come across and I see m5x0.8 with 8mm heads from time to time like on a radiator fan motor bolts and shaft threads for the nut to lock the fan blade on

 

[PCustoms]

These are all over Amazon, McMaster, MSC etc

 

[jayemm]

I searched the forums and found names of some companies that make these retreading tools like lang and jawco but I cant find any m5 x 0.8

if it doesn’t exist how bad an idea is it to use a regular tap and die and just be real careful and go slow?

tbh I haven’t needed one yet but I been using my lang set a lot lately and it’s saving my **** at least once every few weeks and I was looking at the sizes it might be missing that I come across and I see m5x0.8 with 8mm heads from time to time like on a radiator fan motor bolts and shaft threads for the nut to lock the fan blade on

My personal feeling on this (which guarantees some flak) is that the use of regular tap or die is fine if you are careful, especially for lower stress application. I've done it numerous times with no ill effects. Every time this comes up the chicken littles scream the sky is falling and you'll weaken the fastener etc, bla bla bla and you need to buy a thread restoring kit (which you apparently already have). You have to use your judgement but my experience is the amount of metal removed ranges from unnoticeable to negligible. If the fastener is that knackered then replace it.

 

[Ohio Andy]

Grainger has them:

Whoops, we couldn't find that.

www.grainger.com

Also, you can get a Thread File with an appropriate pitch.

https://www.grainger.com/product/NICHOLSON-Metric-Thread-Restoring-File-3MD32

 

[mikey03]

Grainger has them:

Whoops, we couldn't find that.

www.grainger.com

$33 for m5x0.8 but $2 for m6x1.0 can that be right?

 

[Ohio Andy]

$33 for m5x0.8 but $2 for m6x1.0 can that be right?

 

[Ohio Andy]

Yeah he is an entirely different brand, made in the USA. I didn't post links because it actually shows that it has thread size 0.75 rather than 0.80. all of my notes show that it's 0.8. I don't think I've used the thread file on a 0.8; height could be wrong. I just don't remember

 

[308guru]

Unless you have a need to do this a lot, couldn't you just as easily use a threading die with the "wrong" side starting? We're talking chasing/cleaning up threads here right?

I know this isn't really the "correct" use but....

 

[Ohio Andy]

Unless you have a need to do this a lot, couldn't you just as easily use a threading die with the "wrong" side starting? We're talking chasing/cleaning up threads here right?

I know this isn't really the "correct" use but....

I have absolutely done that in the past, but I specifically bought a rethreading kit because I believe it works a little differently...

Without looking, it's probably because a threading die starts with very shallow threads and then gently increases. The word might be the rake of the teeth.

I also think that rethreading dies are usually octagonal so you can use a wrench and I think cutting dies are round. Maybe. I very rarely have to cut new threads so that kit sits mostly unused. And last time I used it I had to cut threads in a hole. Not rethread a bolt. In fact, I don't think I've ever cut threads in a bowl unless I was repairing them. It is so easy just too to buy the right bolt for most of what I do.

And now those with more experience can correct me.