What is this bolt called

[bobj49f2]

I have a handle for a robot cell that has a bolt I've never seen before. It's a one way tamper proof bolt. I've seen other tamper proof bolts on places like public restrooms and electrical boxes but I've never seen one like this. It has five points with five stops turning left, tightening, but upward slopes if you turn to the left, untightening. It is not a torque bolt, a torque wrench just spins in it. I was able to tighten it using a flat blade screw driver but I know it wasn't the correct tool to use.

View media item 66073

 

[2002maniac]

It almost looks like a shear-head bolt.

 

[esvee]

If I were to describe it I'd call it a one-way star head, or pentalobe head.

I kinda wonder if even though the detents are points, it's meant to be driven with a pentalobe bit (since thats the only head type I know of with 5 points).

 

[bobj49f2]

While searching for an answer I saw the pentalobe bolts but they had rounded lobes. They are also Sony or some phone company's proprietary design. These bolt are on a safety handle made by STI, Omron Scientific Technologies. I can contact them, and if they sold a tool, I'm sure they'll want big money for it. I only had this one occasion and I was just curious as to what it is called.

 

[6PTsocket]

With the exception of security torx, I never knew how you would get out those security screws, short of demolition tactics like drilling and ez outs. Are there tools for those one way rest room screws? How would they work? Maybe there is no provision to remove them. Maybe Omron came up with something non standard to make sure nobody gets them out and never intended the device to be repaired.

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[bobj49f2]

I just asked our Fastenal bin man if he knew anything about them, he's never seen anything like them.

 

[Tim37]

I would call it Harold.

 

[wvrailroader]

With the exception of security torx, I never knew how you would get out those security screws, short of demolition tactics like drilling and ez outs. Are there tools for those one way rest room screws? How would they work? Maybe there is no provision to remove them. Maybe Omron came up with something non standard to make sure nobody gets them out and never intended the device to be repaired.

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They make them for the one way screws like are used on license plates. I have a new one that's still in the package. I bought it at a flea market tool dealer a while back. It would most likely work to remove about any kind of one way screw.

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[CoogarXR]

The hillbilly in me says "looks like a flat-blade will turn it!"

 

[Richard Cranium]

Seem to remember that a member on here had a 5 point torx bit set he was trying to sell with in the last year.

 

[Roberts210]

They try to invent all these new "security" bolt and screw heads and all it takes to work on it is a flat-blade screwdriver and some determination. Gotta love it!

 

[B_Bimmer]

If they are not microscopic my solution involves a dremel with a little cut off wheel t make a slot. Then a flatblade really works nicely.

 

[AA/FC]

I would call it Harold.

 

[PelicanPines]

Hump back phillips

 

[T45]

Unless that is loctited in, wouldnt something like Pz-59 (vamplier) work on that?

What size is the bolt thread pitch?

 

[Ray-CA]

Here's a handy chart.....

 

[mbshop]

All these proprietary nuts, bolts and screws drive me nuts. They really have little purpose as most will get them out or off one way or the other. And as mentioned, once out then a slot cut in them by a dremel solves future issues.

 

[Dingleburry]

Hammer and cape/crosscut chisel.
Chamfer the edges of a torx. Pound that sucker in.

 

[Sine Swept]

I'm with T45, though thinking Engineer Pz-55

 

[sgtmac]

Can't you extract it and replace with conventional hardware?

 

[wrench409]

http://www.losspreventionfasteners.com/

I didn't see it in their catalog, but they have braggadocio if they can't fix you up.

 

[6PTsocket]

They make them for the one way screws like are used on license plates. I have a new one that's still in the package. I bought it at a flea market tool dealer a while back. It would most likely work to remove about any kind of one way screw.

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What does it look like? How does it work? Picture?

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[wvrailroader]

What does it look like? How does it work? Picture?

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Here are a few pics.





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[6PTsocket]

Here are a few pics.





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Thanks for the pics. It seems to be sort of a female ez out with that extra thing in the middle. I would think it is head size specific.

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[6PTsocket]

Thanks for the pics. It seems to be sort of a female ez out with that extra thing in the middle. I would think it is head size specific.

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I just cheked on line and you can buy it with different size heads. They push it for rounded off screws. Many reviewers used it for one way screws. I guess they don't want to appear to be selling security defeating tools. The reviews were mixed but considering the whole area of screw extraction the succes rate seemed pretty good.

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[WWheeler]

Here are a few pics.





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Interesting. Is that center piece spring-loaded (push in with pressure), or stationary?

Yeah I see they make them in assorted sized. One on Amazon is 2". lol

Easypower Get it Out "One Way/Rounded Screw Remover"

https://smile.amazon.com/s/ref=nb_sb_noss?url=search-alias=aps&field-keywords=easypower+get+it+out

edit: ok after actually looking at a few of those search results i guess the 2" must refer to the length of the bit, not diameter, and the center piece isn't spring-loaded but is adjustable depth using a set screw. Is that right?

 

[6PTsocket]

I was wrong about the one way. I'll have to read more closely. I was wondering about that center piece. It looks like the business end of a router bit.

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[rlitman]

... I was wondering about that center piece. It looks like the business end of a router bit...

I believe it may be carbide too (I know that some of this type are). It needs to dig into the fastener to get enough bite to make it turn.

 

[wvrailroader]

The center piece depth has a set screw. It isn't spring loaded.

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[cgrutt]

Tamper proof star?

Bit set here for under $10 https://www.amazon.com/dp/B002P4YCGM/?tag=atomicindus08-20