I would appreciate it if someone could give me the technical term for this flathead screw. I have searched high and low for this fastener with no success. The screw I measured was one that I found on a computer case. I am in need of them for my current project I am working on, thanks in advance.
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Mystery Flathead Screw
- Thread starter GamEng
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lumenharold
Mechanical
Flat undercut perhaps? Take a look at:
Harold
SW2007 SP0.0 OW2006 SP4.0
Harold
SW2007 SP0.0 OW2006 SP4.0
It appears to be a standard countersunk screw with a 120 degree bevel instead of the standard 90 degree.
You use to find these everywhere when it was fashionable to build you own box. All the component suppliers had little bags of them, in fact I'm looking at a half bag of them a the present time. Unfortunately it has no label.
How many are you looking for?
I would check.
You use to find these everywhere when it was fashionable to build you own box. All the component suppliers had little bags of them, in fact I'm looking at a half bag of them a the present time. Unfortunately it has no label.
How many are you looking for?
I would check.
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I conferred with my fastener buddy about your fastener and here are some of the conclusions reached.
He has seen fasteners with your approximate dimensions but they had thread forming threads.
The bevel at 120 degrees is unusual in respect that the normal bevels are 82, 90, and 100 degrees. The 120 degree bevel is common on flush rivets for thin skin applications.
We tried to use the backdoor approach by contacting manufacturers of 120 degree countersinks. No luck, they professed no idea of the end use and didn't part with any names of purchasers.
A local box builder, no longer builds, couldn't tell him any of their suppliers even though they were sure they used this size. They were no old hands around.
His suppliers only offered the 82, 90, and 100 degree head as standard. Both had a a quantity 1000 for non-stock items. This might be of help if you find someone who makes them.
Don't give up, strange things have happened on the way to the Forum.
He has seen fasteners with your approximate dimensions but they had thread forming threads.
The bevel at 120 degrees is unusual in respect that the normal bevels are 82, 90, and 100 degrees. The 120 degree bevel is common on flush rivets for thin skin applications.
We tried to use the backdoor approach by contacting manufacturers of 120 degree countersinks. No luck, they professed no idea of the end use and didn't part with any names of purchasers.
A local box builder, no longer builds, couldn't tell him any of their suppliers even though they were sure they used this size. They were no old hands around.
His suppliers only offered the 82, 90, and 100 degree head as standard. Both had a a quantity 1000 for non-stock items. This might be of help if you find someone who makes them.
Don't give up, strange things have happened on the way to the Forum.
CorBlimeyLimey
Mechanical
120° ??? The image shows approx 58° angle. (180-2*64)
![[cheers]](/data/assets/smilies/cheers.gif "[cheers] [cheers]")
Helpful SW websites faq559-520
How to find answers ... faq559-1091
SW2006-SP5 Basic ... No PDM
CorBlimeyLimey
Mechanical
Doh ... that should be 52° ... I need some sleep!
Helpful SW websites faq559-520
How to find answers ... faq559-1091
SW2006-SP5 Basic ... No PDM
- Thread starter
- #15
unclesyd, I do not know the exact angle of the head, and i have no way of checking it other than doing the math. The bottom line is this screw will actually screw in flat to a .072 (14 Ga) piece of sheet metal. This is due to the fact that you cannot countersink sheet metal over 1/2 the depth of the thickness of your material, due to fatigue performance issues. Your standard 82 deg and 100 deg screws will not set flat when you have countersunk the sheet metal to it max diameter.
Heres a few reference links. System will only post one at atime.
Open the pdf file.
Make sure you check the links. Enough for now.
MikeHalloran
Mechanical
Clean up the drawing and send it out for bids.
There will probably be a minimum order of 25,000 pieces or so for a total custom screw, with any features you want.
You will be amazed how small a container that quantity will need.
You will probably be pleasantly surprised at the cost.
Mike Halloran
Pembroke Pines, FL, USA
There will probably be a minimum order of 25,000 pieces or so for a total custom screw, with any features you want.
You will be amazed how small a container that quantity will need.
You will probably be pleasantly surprised at the cost.
Mike Halloran
Pembroke Pines, FL, USA
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