Cracked blades - anyone else?

[amper124]

Hi everyone

Honesty is the most valuable thing so...
1) KAI's are the best and it will not change ...
2) ... but sometimes even "those best-and-top-of-bla-bla-bla" had ... that "bad" day.

Two cracked blades photos from our forum (www.knives.pl).
In both knives, breakage occured near the thumb studs :grumpy:

Sapphire

ZT0200


Of course those failures were covered by the warranty service

Did someone else had similar probem?

 

[Razorsharp244]

Just a comment, there do not seem to be any cracked Sandvik steel.

Regards
//Jerker

 

[Jon Leflar]

Oh noes.

Sad to see that it happened to a Sapphire. Those are really classy knives.

 

[The Mastiff]

I've never seen that before. Had those thumbstuds been changed or the holes redrilled? Jerker, I appreciate your comment about the sandvik steels and aknowledge it but I've never seen that in over 30 years of collecting with any brand. That's why I asked about redrilling.

If that happened on the initial assembly the QC would have caught it. Heat? Cold? Impact? ETC. Something not normal caused that. Joe

 

[SladeGT40]

wow. impressive to crack a 200. never seen anything like that

 

[riffraff]

Huh. Can't imagine why anyone would punch out or redrill a thumbstud on either of those two, since the blades appear unaltered (i.e., no custom work like polishing or regrinding that might require their removal). Very odd.

 

[Morrow]

Do you know how the cracks occurred? It seems odd that both knives cracked in the same place. Was there some sort of testing going on?

 

[Brodie002]

Could batoning (spelling?) cause that type of damage?

 

[2brothers]

Could batoning (spelling?) cause that type of damage?

It most definitely can do that.
But, we don't have all the info from the OP, so we'll have to wait and see what he says is the reason.

mike

 

[J_Curd]

Looks like spine whack damage to me.

 

[orthogonal1]

Looks to me that someone needs to get a prybar.

 

[hunter s thompson]

I don't think that is "normal" damage. There has to be something more to the story. Being far from an expert I think that the damage being in almost the exact same spot on two separate knives in two separate steels seems a little odd to say the least. I am very interested in hearing what caused the damage, but on the plus side at least Kershaw's great customer service again shows why they are the best in the business.

 

[trimcut123]

What do the Kershaw reps think? Abuse...
Or do you come across this during manufacturing?
Matt

 

[J_Curd]

I've never seen this damage in 60+ Kershaws. I dont believe anyone else has seen it or they would have posted about it either now or in the past.

Two different knives from the same user...it's got to be something thats been done during use to both knives.

 

[SPXTrader]

What do the Kershaw reps think? Abuse...
Matt

I don't think the answer to this will be posted. My guess is it was from some sort of user testing. I've beat the snot out of my 0200 and no problems. I've never seen anything like this.

 

[knivesandguns]

I've never seen this damage in 60+ Kershaws. I dont believe anyone else has seen it or they would have posted about it either now or in the past.

Two different knives from the same user...it's got to be something thats been done during use to both knives.

Yup, exactly my thoughts. Why in the same place, on two totally different knives with different steels, etc.

 

[lazerboy2000]

It's odd though because the rest of the blades look to be in good condition, and there isn't any other visible marks of abuse. Also, who the hell would try to abuse a Sapphire?!

It seems that the OP states that he only found those pics on the Polish forum, and they're not his own knives. It also seems that Kershaw has taken care of this.

Of course those failures were covered by the warranty service

Did someone else had similar probem?

 

[amper124]

hehe...
Guys, you are wrong.

Both knives were not:
-used as prybar
-spinwhacked
-twisted
... and used in other "innapriopriate" way

- Sapphire - cracked while its user was clicking with it while watching TV. And...nope - he wasn't watching the X movies
- 0200 broke when cutting a twig - maybe 2 cm diameter :grumpy:

Both cracked 'just like that'

It's quite difficult to me to describe this in english... but i will try :foot:
Well, we have our theory.
It says that studs are inserted as "cold" piece of metal, and are swelling while putted in normal temperature.
Tolerances while doing this are quite small, and sometimes may happen, that additional tensions are produced in the thumb stud hole area.
If something gone wrong - blade cracks as showed on photos.

But... lets not get paranoid.
Those are TWO cases from few hunderd thousand knifes made by kershaw

 

[knivesandguns]

Sounds feasible to me, but since I don't know about how they're made, I'm not going to comment further until Thomas/Tommie gets here.

 

[tommie]

Amper124

We have seen this issue before with the sapphire and splinter. The wall thickness near the stud area on that knife, and the splinter pushed the limits as far a minimal wall thickness goes. If the studs are not true when pressed into those knives it can cause a stress fracture in the blade which may take time to show. We have however have never seen it on the ZT knives, if we look at the location of the fracture on the ZT it goes through the thickest part of that area which indicates that there must have been a stress riser in that area to cause the fracture. Had the crack in the ZT been caused by some abuse it most likely would have cracked in the thinnest area around the pivot. I’m sorry to see that it happened twice and hope you give our warrantee department a chance to set things straight.