Ruined thread

[Valzdl650]

Just putting casing back on and one of the bolts as I was very carefully tightening has chewed the inner thread, I could feel that it felt a bit funny so being super cautious I began hand tightening and as I got the racket and just ever so slightly tightened it just span !! Is there any fixes which doesn’t envolve drilling a new thread 🙏

[nigel s]

Which "casing" ?

[Rixington43]

I have had some limited success with a product called quicksteel which you can put in the hole and drill/tap once set. It won't take a lot of torque but it might be enough for an engine casing bolt if all the others are solid. It's still a drill and tap though and, at that point, if you have enough wall thickness, I'd go helicoil.
Sorry to say I don't think there's a quick and easy fix for a stripped casing thread.

[Mojo-Jojo]

The only other thing I have done previously is to fill the damaged thread with weld, and then drill & tap.

[purplebikeunicorn]

Depends what you mean by casing?

I have "helicoiled" a few threads on non-structural components, and as long as you take your time, you get a good result. The only thing with helicoils is if you do it into a blind hole, the little tang used to install it can be a bugger to get out (unless the screw is short enough that it doesn't contact it).

*eBay special helicoil kits that came with Drill, Tap, Thread inserts, and insertion tool / tang removal punch

[Valzdl650]

Yes it’s the clutch casing Mann!!! Why they do these in alli, yes all the rest of the bolts are in and secure but one just spinning 🫠🫠🫠 I’ll check these helicoils thanks blokes

[nigel s]

As above ,but also look at Time Serts.I use them at work and though more expensive are better for frequently used threads, helicoils can sometimes unwind with the bolt (rare).

[Valzdl650]

OK perfect I’ll look now

[Banditbilbo]

Hi everyone.

Have yoy ever tried thread inserts??

They are great solution in some applications.

Regards