Identifying a bolt (TY 10 S)

[TSGEIT]

I am trying to identify the material of a failed bolt on from a project I'm working on. The construction drawings do not call out any bolts of this type. The bolt is 0.935" diameter, and has the marking TY 10 S on the head. I appreciate any help anyone can provide.

 

[TSGEIT]

Closer review revealed that the bolt is labled as TY 10.9

Sorry for the mix up.

 

[ztengguy]

the 10.9 is the strength, Fy 130ksi, Ft 150ksi, TY might be the mfg?

 

[MiketheEngineer]

Did you Google it???

It might be a Beanie baby or M12 x 40 machine bolt.

A search of the "TY 10.9 bolt" gives many hits.

 

[TSGEIT]

ztengguy, I also found the material properties, but the only TY bolt company I was able to find is just a distributor (TY BOLTS INCORPORATED, Austell GA). I was hoping someone might know of something more specific, as the the failure was brittle, and the bolt should have had higher strength than the other bolts in the connection (not sure how/why this was the only bolt of it's kind installed).

 

[Ron]

You are correct on the 130ksi yield. The "TY" could be a distributor who has cheap bolts made in some other country (private label).

You've probably asked these questions of someone already, but why would the erector be allowed to used a mixture of bolts in a connection? Was there any inspection? If the failure was brittle, it was likely a single event overload or low cycle overload, so the material properties are suspect.

Get chemistry and physical property tests done on the bolt, even if you can only get a hardness test and correlate to strength...better than nothing.

 

[ztengguy]

Yea, how old is the building, can you go back to the fabricator/supplier and have them trace the lot number, etc?

I didnt find any real supplier info on the TY, just the properties.

What was the nature of the failure, was it overloaded, or just one happened to pop?

 

[TSGEIT]

The bolt was actually part of a shorting assembly, so I do not believe that fatigue was an issue (high cycle or low cycle as there was no evidence of repeated yielding).

The connection was overloaded, however no other bolts in the connection failed, all of which should have had a lower strengths.