Screw head identification (work related)

[Zhurdan]

I'm working on a bid for a job with a "bunch" of screws that we need to removed from building sheeting and replaced and being there's a metric shart ton of smart people from all walks of life here, I thought I'd ask for some help. It originally had a plastic hex head on it, but they break off when you try to remove them. The pic below is what remains. It's like nothing I've ever seen and it won't come out all that nice with either a flat head or a modified phillips. Anyone have an idea of what it's called and what is used to remove/install them?
http://i143.photobucket.com/albums/r127/Zhurdan/weirdscrew1.jpg

We've got to remove 187,500 of these little buggers to remove and replace with a high corrosion hex head stainless screws. Any help/info on what this is and how to get them out would be helpful.

Thanks,
Zhur

[MEH]

maybe a Lotus Head Drive

[Fly320s]

Detcord.

That is all.

[BaiHu]

I'm working on a bid for a job with a "bunch" of screws that we need to removed from building sheeting and replaced and being there's a metric shart ton of smart people from all walks of life here, I thought I'd ask for some help. It originally had a plastic hex head on it, but they break off when you try to remove them. The pic below is what remains. It's like nothing I've ever seen and it won't come out all that nice with either a flat head or a modified phillips. Anyone have an idea of what it's called and what is used to remove/install them?
http://i143.photobucket.com/albums/r127/Zhurdan/weirdscrew1.jpg

We've got to remove 187,500 of these little buggers to remove and replace with a high corrosion hex head stainless screws. Any help/info on what this is and how to get them out would be helpful.

Thanks,
Zhur

A buddy of mine is in the building industry-he hangs major glass curtains in the city, etc. He sees it as a galvanized screw used in a wet environment, but that is all he could come up with. He passed the photo along to his fastener supplier, so hopefully I'll have an answer for you later today.

[_JD_]

maybe a Lotus Head Drive


That would be my guess

http://www.instructables.com/id/When-a-Phillips-is-not-a-Phillips-Plus-So-Much-Mor/step42/Lotus-Head/

[JM Campbell]

http://www.securityfasteners.net/Security-Machine-Screws/Security-Shear-Screws-Security-Breakaway-Screws.html#.UC2Bzu5Z4bU

Hope that helps

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[JM Campbell]

Pentalobe is the driver I think.

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