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07-04-2021, 01:03 PM | #1 |
Senior Member
Join Date: Sep 2019
Location: Germany
Posts: 215
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Radiator cap (quail) grub screw size
Hello everyone,
haven't found it with the search, so I'll just ask: While removing the quail from the radiator I lost the grub screw that locks the rad. cap in place. Unfortunately I only realised I'd lost it when I mounted it again, so the screw is god knows where. I'm measuring ~3.65 mm or ~0.142 inch ID at the thread of the quail. So I'm guessing it's a #8 - 32 UNC, is that right? As we only have metric screws in our DIY-shops I have to order one online, so I'd like to get it right the first time. Thanks, Daniel |
07-06-2021, 11:45 AM | #2 |
Senior Member
Join Date: Sep 2019
Location: Germany
Posts: 215
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Re: Radiator cap (quail) grub screw size
*up*
Is that the right size? If not, can someone measure the screw for me? |
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07-06-2021, 12:01 PM | #3 |
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Join Date: Apr 2018
Location: Mebane NC
Posts: 2,355
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Re: Radiator cap (quail) grub screw size
I believe it is a #8-32 x 1/8" set screw. It's poorly documented and it's possible that different vendors used different sizes.
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07-06-2021, 08:03 PM | #4 |
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Join Date: Apr 2013
Location: santa rosa ca
Posts: 257
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Re: Radiator cap (quail) grub screw size
Why not just re tap the threads to metric and use a metric set screw. Who’s going to know? I won’t tell anyone. ; )
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07-06-2021, 09:01 PM | #5 |
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Join Date: Sep 2019
Location: Fort Gratiot, Michigan
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Re: Radiator cap (quail) grub screw size
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07-07-2021, 08:37 AM | #6 | |
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Join Date: Sep 2019
Location: Germany
Posts: 215
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Re: Radiator cap (quail) grub screw size
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Quote:
That would be a good solution, but I think I want to save that for when the thread is damaged. With how thin the cap is in that area I believe that's bound to happen in the future. Guess I'll just try the UNC and if it is a different thread I'll re-tap it. |
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