Little Tritium glow tube might be better...

*stares in Cherenkov radiation*

Iron giant bolt :)

Green startrek borg-esc green led

Huck bolts

It sounds like a huck bolt. I see them all the time on commercial truck frames such as semis and dump trucks. I don't know if they are as good as a true rivet that was installed red hot. But I've never seen a huck bolt loosen up. Really cool bolt.

I've bought Ebay items from Ukraine before. Their entire postal system seems to be stamps, no electronic metering.

I'm not sure if those would have been the same type of bolt, as these were only standarized in 1981 in Japan. And only then were gradually being adopted and standardized around the world. Other types of tension fasteners, shearing pins, etc did exist prior of course, but not these types.

You can Google " Steering Column Shear Bolt Part: 2053 " to see the image. Apparently GM, VW and several other companies used similar shear bolts in the 1970s

Every car has them as anti theft measure, they turn Easy with a chisel and a hammer

I think that in this application these are called "security bolts"!

The Greenkote idea is a little stupid when you’re shearing off the tip and exposing the whole bare end to the elements anyway. Those bolts will not last 100 years if not fully coated.

@@berkcanberk4947 I was going to comment this exact thing. Rust will find a way... always! It only needs the smallest of exposed metal weak points to start spreading like a cancer.

@@berkcanberk4947 Galvanic corrosion protection WILL protect the exposed end while there is coating left that it in electrical contact with the corroding fluid. This method is the same as used on metal hull boats by placing sacrificial anodes made of Zinc or Magnesium in a few places around the boat. Even a rubber dinghy with a outboard motor will have some attached to the motor. Obviously if there was a drop of corrosive liquid (not pure rain water but some water with ions from acid rain or similar) that was in the middle of the cut end it could slowly corrode into the end of the bolt. I also see a strong likelihood that the inspector will dab some paint over the end of the bolt when he is checking that they have been sheared off.

That bolt will certainly last far more than 100 years even with the tip exposed unless it is placed in an extremely corrosive environment, which the top/sides of a metal structure exposed to the wind and sun is not.

It's an effective alloy blend that is corrosion resistant, not like other metals that are galvanized or form a protective oxide layer. There is no "raw" end as the entire bolt is made of the metal​@@berkcanberk4947

Washer on the bolt side yeah your right, it was just easier to hold that way. Yeah my understanding is the tool tensions against the nipple on the end but it’s only the nut that rotates. When the correct tension is reached the nipple is twisted off by the tension.

@Turbobuttes and​ @Curiosity_lab Sorry, my previous post was wrong. *The washer does indeed go on the nut side!* And the tool to fasten them is indeed made out of 3 parts (outer shell, and two counter rotating inner sockets). And works in three stages: First the inner socket grips the spline on the end of the bolt and keeps it static. Then the outer socket turns the nut until the proper tension is reached. Then the outer socket keeps the nut static (because of enough tension, it doesn't rotate anymore), and the inner socket holding the spline then start to counter rotate (because that is the only way where the rotational force can go now/path of least resistance) and shears the spline off. What I said before about other 'normal' shear or security bolts is still correct though: they usually have two heads: one round head and a hexagonal head on top which will be sheared off, so only the round head is left behind. The only difference is that with these traditional normal bolts, you apply the rotation and force on the head side, while holding the nut still on the other side (with a spanner or whatever). So, for this you need access to BOTH sides. What makes this 'Chernobyl' bolt so special is that you only need access to one side to do the very same thing! And thus can be done with one tool, instead of two. Exactly as how a pop revert and its automatic fastening tools work; you only need access to one side too. Also, another massive benefit is that no torque is introduced in the bolt itself, just axial load/pure tension. In essence, this 'Chernobyl' bolt is a cross between a pop revet and a bolt. -- These types of bolts are called TCBs (Tension Control Bolts) and are used in various ways and applications. To be clear, they are NOT specific to Chernobyl, nor are invented for it! (they were in use since a few years before Chernobyl happened). They were chosen to be used in Chernobyl because of their excellent mechanical properties.

@@Curiosity_lab Animation of how a TCB works: kzfaq.info/get/bejne/acekidafkpqxYaM.html

As an engineer this is a great write up^

I agree with you. The washer is most likely hardened as well to prevent galling which would interfere with the torquing process.

Thanks, yeah I’m sure the bolt seems pretty mundane to someone with decades in the industry, but the mechanism is new to me and I thought it’s use in the Chernobyl project was pretty interesting.

@@Curiosity_lab oh, I couldn't agree more. I was a 31 year old commercial fisherman in Alaska, with a 2 year old (and ready to retire after 14 years) when a friend of mine on a sister boat suggested I join the Ironworker's union. I did just that and I learned the answer to a question I heard about when I was 12. Driving past a tower crane, my stepdad pointed out a tower crane, and he said "those cranes put themselves up & take themselves down, which is 90% true. I actually got to help the crane Ironworkers jump a tower rig a couple of times. If you don't work on learning something new everyday, you're not living. I loved your video, and the model of Chernobyl that you made really impressed me. Without your artistic talent in painting the reactor to look so ravaged, it would look like a half finished model because the printer ran out of plastic filament

Anodic corrosion protection.

Most good quality bolts will last 100 years if not exposed to harsh conditions such as road grit or sea air.

I wondered the same thing, but I suspect that the nut side of the bolt is on the inside and therefore shouldn’t be exposed to the elements. If only small amounts of water reached it, I think the anodic reaction between the exposed steel and the exposed zinc coating would protect it for a very long period of time.

Sacrificial anode cathode corrosion protection. The outer layer isn't paint or a traditional surface coating, it's a less noble metal that corrodes instead of the steel of the bolt. The process is commonly used on large metal structures, particularly bridges and dams.

@@Sky-._ Now that is a proper answer

He got it from the click bait need for a half decent story. From what I understand, TC Bolts are used extensively in bridges all over the world.

​@@petert3355wind turbines, too. Basically many huge that are made from steel and need to be assembled in place.

@@petert3355I obviously don’t know (not a mind-reader ;-), but I think he probably just heard about the tech when reading about Chernobyl and went looking for a sample; I don’t think he was aware of the bolts before he learned about them in association with Chernobyl.

Exactly, as an avid S.T.AL.K.E.R. fan and Eastern Europe - Soviet history enthusiast. This brings me warmth at another level.

Yes I was referring to the torque on the spline by the machine not the pressure of the bolt. The 125 kg number was the only reference I could find to the shear force on this bolt. Looking at it I think your right about about it being in ft kg as that would roughly equate to your numbers in ft lb. I guess someone tried to convert it from lb to kg at some point and left of the ft. Thanks for pointing it out.

I was thinking you probably saw kN and said kg

It's hard not to be a conspiracy theorists in this case, as much as I hate to be one

Also, they did still use pre-cast concrete blocks quite a bit during the construction too. Like, the wall used to add some shielding included a large wall between the work site and reactor building, and I think some of the fillers (basically just the structures that filled in any gaps on the structure) were just pre-cast blocks that were lowered into place before the shelder was slid into place.

So are empty shell casings

I’m sure that was the motivation for sharing them out. But for the Chernobyl project specifically they made special presentation boxes for some of the bolts to give to higher ups, politicians etc. You can see some of the bolts with boxes on eBay if your interested.

one's junk is another one's treasure! PS: And I'll bet Kyle Hill would want such a display with bolt too ;-)