"Ned Simmons" wrote in message
...
In article 95M2c.215$yt3.104@newsfep3-
gui.server.ntli.net, says...
snip
My situation is that I'm using a Hammond aluminum enclosure - dimensions
shown he
http://www.hammondmfg.com/pdf/1455L1601.pdf (150KB)
The #6 machine screws supplied (Phillips) to attach the 1.5mm thick face
panels actually sit proud of the panel.
snip


As Robin said, .307 is the max head diameter for a #6 flat
head hex socket screw. For a standard #6 flat head Phillips
or slotted machine screw the max head dia is .279 . If the
head height is greater than the thickness of the panel
you'll have to either put a small contersink in the
threaded hole, or get hold of the flat head screws often
seen on electronic equipment panels where the head is
truncated at the intersection of the head and body. Clear
as mud?

Normal flat head:
________
\ /
\ __ /
| |
| |

Truncated flat head:
________
\______/
| |
| |

Does anyone one know what this head style is called?

Ned Simmons


Hi Ned,

Many thanks for your explanation.

I now realize I've been asking the wrong question - sorry to you all.
Looking at the Hammond enclosure diagram more carefully it says #6 screw,
but #4 head. Indeed, the head is the same diameter as some other #4 screws I
have around (but the thread is wider than those). I think this is what you
mena by the truncated flat head.

Sorry for the confusion! So my question should have been this:

What is the max diameter of the head of a #4 flat head Phillips machine
screw?

Thank you,

Jim