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radiator drain screw thread size? 9 years 6 months ago #7478

  • rdbhere2
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Plastic radiator screw. Nice. Anyone know what size thread it is? Thanks a lot.
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radiator drain screw thread size? 9 years 6 months ago #7479

  • Kawboy
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Just pulled mine out of my 1980 B2 and it measures up at 12mm diameter with a 1.25mm thread pitch and it's 15mm grip length.

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radiator drain screw thread size? 9 years 6 months ago #7480

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Great info. I found this $3 screw at Pep boys auto parts after I ordered a $14 screw from the dealer.
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radiator drain screw thread size? 9 years 6 months ago #7481

  • Tyler
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Should work if its stainless, you need the rubber washer from your broken screw.
1981 KZ1300

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radiator drain screw thread size? 9 years 6 months ago #7482

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Awesome. It will take a week for the (plastic) drain screw to arrive.

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radiator drain screw thread size? 9 years 6 months ago #7485

  • Kawboy
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rdbhere2 wrote: Awesome. It will take a week for the (plastic) drain screw to arrive.


I would have gone to a local rad repair shop to get one. Lots of automotive rads have plastic drain plug screws with the face seal and I'm sure that they wear out so to speak from people draining their rads while the rad is still warm and under pressure and that would tear up the threads.

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