? Screw head diameter?

Morgans wrote:
"jls" wrote

I know an A&P who bought all his screws for the rib-to-spar fasteners
and LE on a J-3 at the local hardware store. Does that mean he's loose
as a goose? Or looser?

I would have to believe that they do not meet specifications for repairing a
certified aircraft.

I might trust them for holding skin down, but not much more than that. No,
I take that back. I don't trust them that far.

Have you seen the quality of the hardware nuts and bolts and screws, lately?
Chinese steel is of such low quality, I would be surprised if it was 25% the
strength of a part to MilSpec part comparison.

No, I would not bet my life on the saving of a few bucks by using unknown
hardware screws. If I'm that short of cash, I will go fly model airplanes,
or something.
--
Jim in NC

You've got a point. I buy all my PK-type screws from ACS but even then
I get some I don't like. The CRS screws I have quit using because they
tend to break.

"Michael Horowitz" wrote in message
...
MS24593 is a flat head machine screw with a 6-32 shank/thread. In this
application the diameter of the screwhead is important.

I went to HD and bought a 6-32 machine screw to see what length I
needed (the original having rusted beyond recognition). I compared the
HD screw with the MS and noticed it was 1/4" dia. as compared to 3/8",
so I'm wondering if I order the MS screw if the head will be large
enough.

A 6-32 countersunk screw with a 3/8" diameter head? Even a 10-32 screw with
a 100° countersink will barely be 3/8".

If you meant 3/16", then the difference in the head diameter is due to the
87° or 90° countersink on the hardware store screw.

On Mon, 1 Jan 2007 09:59:15 -0800, "John Kunkel"
wrote:


"Michael Horowitz" wrote in message
.. .
MS24593 is a flat head machine screw with a 6-32 shank/thread. In this
application the diameter of the screwhead is important.

I went to HD and bought a 6-32 machine screw to see what length I
needed (the original having rusted beyond recognition). I compared the
HD screw with the MS and noticed it was 1/4" dia. as compared to 3/8",
so I'm wondering if I order the MS screw if the head will be large
enough.

A 6-32 countersunk screw with a 3/8" diameter head? Even a 10-32 screw with
a 100° countersink will barely be 3/8".

If you meant 3/16", then the difference in the head diameter is due to the
87° or 90° countersink on the hardware store screw.

I do believe you are correct; and I think I solved my problem.
Blueprint shows a simple 6-32 machine screw used vice the flat head;
I'll take that approach using an AN526 and countersink that - Mike

Michael Horowitz wrote:
MS24593 is a flat head machine screw with a 6-32 shank/thread. In this
application the diameter of the screwhead is important.

I went to HD and bought a 6-32 machine screw to see what length I
needed (the original having rusted beyond recognition). I compared the
HD screw with the MS and noticed it was 1/4" dia. as compared to 3/8",
so I'm wondering if I order the MS screw if the head will be large
enough.

The difference I'm seeing is caused by the 100^ angle on the MS screw,
but I don't know if the final diameter will match the original.

Would anyone with experience with the MS24593 screw please weigh in? -
Mike

http://assist.daps.dla.mil/quicksear...t_number=40617

Rev C has the complete dimensional specs.

Looks like about 5/16 for #6


"flybynightkarmarepair" wrote in message
oups.com...

Michael Horowitz wrote:
MS24593 is a flat head machine screw with a 6-32 shank/thread. In this
application the diameter of the screwhead is important.

I went to HD and bought a 6-32 machine screw to see what length I
needed (the original having rusted beyond recognition). I compared the
HD screw with the MS and noticed it was 1/4" dia. as compared to 3/8",
so I'm wondering if I order the MS screw if the head will be large
enough.

The difference I'm seeing is caused by the 100^ angle on the MS screw,
but I don't know if the final diameter will match the original.

Would anyone with experience with the MS24593 screw please weigh in? -
Mike

http://assist.daps.dla.mil/quicksear...t_number=40617

Rev C has the complete dimensional specs.