Can You Repair A Stripped Thread With Metal Putty? - Bicycle Stem Fix 

Better use thread inserts (or Helicoils - needs special tools) for these. They are available self tapping or with a proper outer thread (e.g. M10 for your M6 bolts)

Worth a try, even if it didn’t work out. I’d be more inclined to drill out a wide, shallow recess on the other end and epoxy in a metal nut. Or braze up the hole and drill it out and retap.

Helicoil every time for threads, metal epoxy is only really good for filling lost metal or cracks in unstressed places.

nice one - thanks :-) I remember the bad old days before owning a torque wrench - just trying to feel for that point before stripping the thread. never nice with expensive components!!

yeah i really wouldn't trust this on something as critical as a stem

Surely a helicoil is a better option?

weld it redrill it rethread it or rethread it bigger size 7 or 8mm

You could just use a thread insert and avoid all the extra hassle. Plus the new thread will actually be more wear resistant, cuz the inserts are made of steel. I did such repair on an old marzocchi 888 fork actually in 3 places (1 bolt on the crown, and 2 bolts holding the axle), 3 months had passed, with repeated hucking to flat from 1.5m and even 2m (onto asphalt), and its still doing well

Had luck with JB Weld on a stripped water bottle cage boss. But that's a low torque requirement.

The torque you have to tighten the bolt to is not equal to the kind of force the material has to withstand in a regular use situation. So in a stem, this really is a bad idea. Those epoxy "metal" fillers are good for making cracks seal again, or make them airtight/oiltight. For thread repair on a part that is not critical when failing - like the thumbie clamp - it should be ok. I would use JB-Weld though. It is much tougher. Usually threaded inserts are the correct way to repair a stripped thread.

I’ve done this very procedure to fix a broken barrel adjuster mount on a frame, but that doesn’t take anything like the torque of a stem.

dont need to repair the thread, if you have open end on the other side may be just use a longer bolt and put a nut on the other side? Also if you really wanna make threads without usign any drilling then use jb weld to fill the hole and put in the bolt. make sure to cover the bolt in either wax or wd40 or transmission fluid so that it doe snot stick to jb weld.

Aquela mesa que merece uma reforma acabamos tirando a rosca dele e fazemos um furo leve no lado da rosca na medida da porca para ela não passar e também ficar para fora, usamos um parafuso com contra porca ai ele pega novamente aperto e a contra porca entra neste furo que fizemos para ela . Ai dura muito mais pois é só trocar se um dia precisar trocar os parafusos novamente, . valeu pela dica .

ive got a tranz x stem like this, but its buggered, its got a massive crack, shame because its pretty slick for a classic

i´ve got the same stem in decent condition sitting on a shelf collecting dust. so if you need one for a project, let me know.

Stem bolts should be tightened to 5/6 nm, so should be fine?

Tech!!!!

i like j/b weld two part risen leave it set over night ?!!!!!

No way does this go hard in 10 minutes .

Try super glue and baking powder instead of putty..

Definitely let the putty harden out for 24 hours at least

If u are suicidial....others get a new one!