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#11
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? Screw head diameter?
Morgans 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. 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? - I would be very curious as to what the application is for this screw. If it is going to be any more important than holding a radio in the panel, then you need to be thinking about the quality and strength of the screw. HD screws have no strength guarantee, compared to a MS screw. They may have only 10% of the strength of a MS screw. If that is the case, the head size is the least of your worries. I hope you are not using hardware store screws in your homebuilt for any important functions. You are gambling your life. You could be a _big_ looser. -- Jim in NC A big looser? What is he going to loose? A goose? Anyway, what he's doing is restoration and the screws he's using probably hold on a leading edge of aluminum sheet or attach ribs to a spar. That's why they rust beyong recognition. If they were on a Taylorcraft wing or aileron, for instance, they were off-the-shelf screws. So using them would in all likelihood not make him any "looser." Anyway I doubt if the PK screws used in such a case are (or were) the same Air Force-Navy quality you find in an AN bolt or nut. I have removed some of those screws from an old certified airframe and the heads break all to hell. 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? |
#12
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? Screw head diameter?
"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 |
#13
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? 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. |
#14
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? Screw head diameter?
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. |
#15
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? Screw head diameter?
On Mon, 01 Jan 2007 11:06:27 -0500, Michael Horowitz
wrote: On Mon, 1 Jan 2007 09:47:48 -0500, "Morgans" wrote: I mentioned HD and the cml screw because I thought the cml screw would have the same profile as the MS screw and I could use it as a model of what to purchase. What I didn't realize is that the underside angle of the head (countersink) for the MS screw was different from the cml screw, so that was a good idea gone bad. Still don't know if a #6 MS24694 is going to give me a 3/8" dia head. Head diameter, 0.3765 to 0.3813. Google is your friend, http://www.hi-shear.com/standards/hst13.pdf There are several head angles common, 82, 90, 100, and 118 which I've used in various applications for various reasons. |
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