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.
convertible rear window question
- Thread starter oswego37
- Start date
deuce_roadster
Well-known member
Maybe foreign, metric? I would check for that.
deuce lover
Well-known member
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.
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Karl Wescott
Well-known member
Dont argue with Kube... 5-40 is what was used 1928-40.
Don Rogers
Well-known member
ford38v8
Well-known member
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!
Don Rogers
Well-known member
Ford38v8...If you saw my 401k you would'nt say that!!!
I could not agree more. Don amazes me time and time again. Not to mention just how willing he is to help.
Thanks Don!
Don Rogers
Well-known member
Mike, You are too gracious!!!!
You are too humble.
rotorwrench
Well-known member
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.
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.
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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.
rotorwrench
Well-known member
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.
There might even be some British Association threads that are close but the pitch is different.