Hardware screw size?

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smoss
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Hardware screw size?

Post by smoss »

For the life of me I cannot find an exact replacement for all the hex button head screws that hold on the wheel pants and access panels. SAE #8 and 10 bolts are pretty close, and will work, but not exact, and metric 4 and 5 mm bolts look close, but will not screw in, it appears the standard pitch on my screws is off a smidge. As the hex heads routinely strip on me, a good set of accurate replacement hardware would be very helpful. Any ideas?
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Steve
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Re: Hardware screw size?

Post by Steve »

The access panel screws are M5X12 A2 stainless steel button head cap screws (MST 7380). You can get them from:

Metric Screw and Tool Company

http://www.metricscrew-toolco.com

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smoss
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Re: Hardware screw size?

Post by smoss »

is that an M5-.8 ? I tried M5-.8 and they won't screw in (unless maybe my anchor holes have just been bent out of wack by the #10 bolts that have replaced most of them. I know there are non-standard pitches available out there, but not sure if that's the case.
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Re: Hardware screw size?

Post by Steve »

Yes, they are .8 pitch. Your nut plates may be buggered up...
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Re: Hardware screw size?

Post by smoss »

Thanks Steve. While I'm ordering them, might as well order the seat access panel ones too. Happen to know what size they are too?
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Re: Hardware screw size?

Post by Steve »

Unfortunately, no. My airplane doesn't have the seat access panels (I have to remove the seats at each Annual). It should be in the online parts manual, though. You could try running a M5 tap through the nutplate - that may clean it out enough to make the cap screws fit better...

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Re: Hardware screw size?

Post by smoss »

I got the exact sizes for all the wheel pants, wing access panels, and front and rear seat access panels, and ordered up the lot from mrmetric.com
They fit perfectly, and what a joy to not have any stripped hex heads. My order recap is below, cheap and fast:

Item
Qty
Description
Rate
Amount
M11522 50 M5X12 Button Head Socket Cap Screw Stainless Steel A2 ISO7380 $0.10 $5.00
M11512 15 M4X12 Button Head Socket Cap Screw Stainless Steel A2 ISO7380 $0.06 $0.90
M11514 5 M4X16 Button Socket Head Cap Screw Stainless Steel A2 ISO7380 $0.08 $0.40
M11524 30 M5X16 Button Head Socket Cap Screw Stainless Steel A2 ISO7380 $0.12 $3.60
M11541 24 M6X20 Button Head Socket Cap Screw Stainless Steel A2 ISO7380 $0.17 $4.08
M61001 15 M4.0 Flat Washer Nylon DIN125A $0.04 $0.60
M61002 101 M5.0 Flat Washer Nylon DIN125A $0.03 $3.03
M61003 25 M6.0 Flat Washer Nylon DIN125A $0.04 $1.00
Total $18.61
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Rick
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Re: Hardware screw size?

Post by Rick »

Wow, thanks Steve - that's really helpful! For $20, I may order a set, too, just to have around for the next annual...
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Re: Hardware screw size?

Post by mdieter »

Thanks, just order the whole lot. It sure was nice to have all the sizes and specs ;-)
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Re: Hardware screw size?

Post by Gasser »

Me too, cost all of 8 bucks for 10 of each size plus washers.
Jeff

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