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Old 07-24-2019, 03:56 PM   #21
Join Date: Jun 2019
Location: Marana Az the town
Posts: 66
Year: 77
Coachwork: Gillig
Engine: 855 Cummins big cam
Rated Cap: single axle
You can't successfully use self tappers in sheet metal because the drill head is removing the very limited thickness of material you are trying to hang the threads in. If you absolutely must use sheet metal screws bang a hole in the sheet metal with a very sharp scratch awl, which will add to the amount of material the screw threads have to hang in. The ultimate solution to the problem of screws in sheet metal is nutserts. You can but a nutsert setting tool on ebay quite reasonably, the nutserts are quite inexpensive when bought by the hundred. Something like 10/24 will do almost anything you will want to fasten. I have ended up buying 8/32, 10/32 and 1/4 20. Once you use these you will never want to be without them.

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Old 07-24-2019, 08:16 PM   #22
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Join Date: Jul 2019
Posts: 4
Originally Posted by CMORGANSKOOL View Post
I bought self tapping screws from home depot that I can remove and reinstall. They're called self tapping zinc coated metal joist screws I think They come in a black box. I'll take a pic thursday when i'm on the bus. I've used them all over the bus. I think these are the screws.

Another alternative is to use the screw clip or anchor
I'm wondering if, for me, the 3/4 inch screws will be too long and penetrate the outer shell of the bus. I'd be using them to attach 1/8" laminate over reflectix, rather than a more substantial ply.
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Old 07-25-2019, 10:46 AM   #23
Join Date: Apr 2019
Location: Dallas
Posts: 29
Year: 2001
Coachwork: GILLIG
Chassis: G18E102R2
Engine: Cummins ISC 8.3
Rated Cap: 23 sits 33 stand
Originally Posted by musigenesis View Post
Yeah, that's the kind I'm using (only with a gasket washer as well) but they don't seem to be coming out. Maybe that gasket is hosing things?
You probably stripped the threads out of the sheet metal when you installed the screw. That type of fastener is basically a single use screw. Sort of a self drilling pop rivet widly used on gutters and such.
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Old 07-25-2019, 09:28 PM   #24
Join Date: May 2019
Location: Ohio
Posts: 17
Year: 1996
Coachwork: Bluebird
Chassis: Ford
Rated Cap: 44
Another idea is Drill oversize hole on the inside of door. Drill hole in plywood for a bolt. Maybe a 1/4-20. Counterbore oversize hole so nut fits in allowing the plywood to sit flush. Then JB Weld the nut to the door. I’ve had a lot of success with this product.
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