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Old 02-09-2020, 01:57 PM   #1
oswego37
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Default convertible rear window question

I bought a rear convertible frame at Hershey, supposedly for a late 30's car. The screws that hold the metal halves together appear to be an odd size. They measure approximately .118 inches. that seems to me to be a #5 screw. Can anyone verify that as I have to clean up the threads to assemble it. Thanks for looking.
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Old 02-09-2020, 02:13 PM   #2
deuce_roadster
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Default Re: convertible rear window question

Maybe foreign, metric? I would check for that.
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Old 02-09-2020, 02:15 PM   #3
deuce lover
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Default Re: convertible rear window question

I believe they are 4 - 40 oval head slotted. $6.38 for 100 SS on Ebay,free shipping. Hardly worth rechroming the original 14 that are required.

Last edited by deuce lover; 02-09-2020 at 02:25 PM.
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Old 02-09-2020, 02:22 PM   #4
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Default Re: convertible rear window question

Quote:
Originally Posted by oswego37 View Post
I bought a rear convertible frame at Hershey, supposedly for a late 30's car. The screws that hold the metal halves together appear to be an odd size. They measure approximately .118 inches. that seems to me to be a #5 screw. Can anyone verify that as I have to clean up the threads to assemble it. Thanks for looking.

The authentic screws in a '36 - '40 frame were 5-40 x .375" as I recall.
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Last edited by Kube; 02-09-2020 at 03:01 PM.
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Old 02-09-2020, 02:50 PM   #5
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Default Re: convertible rear window question

Thanks, 4-40 makes more sense.
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Old 02-09-2020, 06:25 PM   #6
Karl Wescott
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Default Re: convertible rear window question

Dont argue with Kube... 5-40 is what was used 1928-40.
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Old 02-10-2020, 09:24 AM   #7
Don Rogers
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Default Re: convertible rear window question

From the Archives.....If the frame was die cast the screws were 6-32. If the frame was stamped steel then the screws were 5-40. See below:
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File Type: jpg rear frame 01.jpg (34.6 KB, 24 views)
File Type: jpg rear frame 02.jpg (41.7 KB, 26 views)
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Old 02-10-2020, 12:33 PM   #8
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Default Re: convertible rear window question

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From the Archives.....If the frame was die cast the screws were 6-32. If the frame was stamped steel then the screws were 5-40. See below:

While others may base their advice on memory, Don Rogers always backs up his advice with research. That is not to say others are wrong, but that you can always take Don's advice to the bank!
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Old 02-10-2020, 02:52 PM   #9
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Default Re: convertible rear window question

Ford38v8...If you saw my 401k you would'nt say that!!!
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Old 02-10-2020, 03:41 PM   #10
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Default Re: convertible rear window question

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Originally Posted by ford38v8 View Post
While others may base their advice on memory, Don Rogers always backs up his advice with research. That is not to say others are wrong, but that you can always take Don's advice to the bank!
I could not agree more. Don amazes me time and time again. Not to mention just how willing he is to help.
Thanks Don!
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Old 02-11-2020, 10:03 AM   #11
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Default Re: convertible rear window question

Mike, You are too gracious!!!!
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Old 02-11-2020, 02:36 PM   #12
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Mike, You are too gracious!!!!
You are too humble.
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Old 02-11-2020, 03:33 PM   #13
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Default Re: convertible rear window question

Actual experience goes a long way.

The #5 screw size is kind of an odd duck. Most sizes in general use are even number from 2 through 10 with a machine screw thread of 32 TPI and even the #12-24 is hard to find sometimes. The 2-56 and 4-40 sizes are exceptions to the thread pitch size from 2 through 10. In aviation, there is no #5 diameter usage. Nothing smaller than #2 is available and #3 diameter is also non existent.

You won't find too many taps or dies in a #5-40 size either. While they may be out there, there is not too much call for them.

Last edited by rotorwrench; 02-11-2020 at 03:41 PM.
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Old 02-11-2020, 03:50 PM   #14
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Default Re: convertible rear window question

eBay is your friend for #5x40tpi tap
Knife makers use them.
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Old 02-12-2020, 07:20 AM   #15
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Default Re: convertible rear window question

I misread Kubes comment, just had eye surgery. already looked up the taps.
Thanks again to all
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Old 02-12-2020, 08:19 AM   #16
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Originally Posted by oswego37 View Post
I misread Kubes comment, just had eye surgery. already looked up the taps.
Thanks again to all
If you plan on tapping the holes, do so very carefully with this (small) size. If you can purchase a bottoming tap, that would be best suited for this task.
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Old 02-12-2020, 02:29 PM   #17
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Default Re: convertible rear window question

I believe the plater put a #4 screw in each of the holes in the frame. that would explain why the original screws dont fit. Thanks Kube , I did find a bottom tap. steady careful hands may be another story!
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Old 02-13-2020, 12:37 PM   #18
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Default Re: convertible rear window question

It's more likely they put 6-32 in since they are common. May have been similar sized modern metrics as well. The 4-40 is the same thread pitch but would be too loose to stay in or may not even hold at all since they are smaller. I hope you can straighten those threads. Getting a heli-coil for that size might not be possible.

There might even be some British Association threads that are close but the pitch is different.
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