Why Bolts and Screws Strip How to remove a striped bolt /bolt thread shear failure Part 1

Construction Engineering & Failure Analysis

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This is what shear failure is in the the threads of a bolt / screw.
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Опубликовано:

2 окт 2024

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Комментарии : 31

@mattludy 2 года назад

I've been hunting for a video on removing stripped threaded/stuck bolt, all I could find was stripped heads. I appreciate your video!!! I have a motor mount bolt that was factory cross-threaded, it came out 1/2 way and now it just spins. Will not go in or out. Just spins and its stuck, how do I get it out? Should I just cut it off and drill it out? Any help would be greatly appreciated.

@castertroybalo1487 2 года назад

your idea helped me, great thanks sir!!!

@EngineerPEretired 2 года назад

Glad it helped, wish you success.

@atranimecs Год назад

and if you can't get to the washer?

@EngineerPEretired 5 лет назад

The ''clamped material'' canNOT compress any more and the ''helix'' of the screw keeps turning -- the nut threads / helix being stronger than the screw... the threads of those that screw fails. This is what shear thread bolt / screw / helix failure looks like in the threads...

@Unknown-pf2je 10 месяцев назад

have a bolt like this on my oil drain bolt finally somone knows but this method won’t work for me

@EngineerPEretired 9 месяцев назад

Thank you for the kind feedback

@olenaerhardt7725 3 года назад

Attaching the new brakes, I crossed the bolts. They went in very hard, I thought it was because of new rubber inserts (they came together w/new brakes) I put in holes for those bolts. They stopped ~1/4 in before the end, where they are supposed to be, and started to rotate free both ways (clockwise and counterclockwise), I can't extract them, because they rotate. Can I drive a car with these bolt for a while, since they don't come out before I buy a new knuckle, and actually I don't know how to extract them? Thank you for a good film.

@EngineerPEretired 3 года назад

The bolt and or nut you are referencing is not really a '' spare part'' and I would not recommend you ignore it... Simply cut the nut if you can and is a nut you can access or you will have to drill out the center of the ''striped threaded'' screw... If, you can add heat, that may help it gain enough grip to "unwind it".

@olenaerhardt7725 3 года назад

@@EngineerPEretired Thank you very much, you were so right! I extracted those two bolts yesterday, the picture was: one bolt was broken completely (threaded part was left in the hole of the knuckle, and the cylindrical part was by itself in the caliper), and that is why it was rotating freely, another one totally messed up the thread in the knuckle hole, as well as its own thread, so also rotated free. I ordered new knuckle, both to be on the safe side. God Bless you Sir!

@EngineerPEretired 3 года назад

Your welcome and I pleased to read your comments of success!

@lucienl9465 3 года назад

This is amazing Thank you for all your time and describing this!

@EngineerPEretired 3 года назад

My pleasure!

@idahodiy 3 года назад

Thanks for that, got a stripped bolt off my shifter with a little lift from a chisel

@EngineerPEretired 3 года назад

You are welcome, glad I could help.

@bestworst1979 3 года назад

damimt i have this issue right now with a caliper boilt it spins both ways freely but wiont unthread

@EngineerPEretired 3 года назад

Drill baby... Only stay inside the shank or major part of screw.

@bestworst1979 3 года назад

@@EngineerPEretired I USE A COLD CHISEL to put outward pressure and i cranked it out needless to say the thread on the bracket were gone but the bolt was gtg

@justjoshin5140 3 года назад

I’m having this problem with the bolt that holds the gas tank strap on my 2001 Sierra. It’s a pretty tight spot too which makes this much harder. It just keeps spinning no matter what I do I can’t get it out

@ValidEric Год назад

@@justjoshin5140 did you figure it out by any chance?

@yojbagsarsa1170 2 года назад

Thankyou super appreciated

@MrTruthislight 2 года назад

Yeah this video is missing the second part of the title

@EngineerPEretired 2 года назад

What specific are you looking for?

@flatlineoptimism2600 2 года назад

I have a question.. If after tightening a bolt the thread gets stripped, is all of the tightening progress made thus far essentially useless?

@EngineerPEretired 2 года назад

Simple answer, yes; I want you to think of the threads as a screw wedge system, you just lost your wedge and each time you try to get the wedge to work, the wedge is fractured and cannot gain in clamp force.

@flatlineoptimism2600 2 года назад

@@EngineerPEretired Okay. Thank your for the response.