I am having a very difficult time identifying this thread. This part is a plug that I am trying to replace because the threads were stripped.

The best fit for pitch is 11 threads per inch (imperial), but the major thread diameter is 32mm. It does not appear to be tapered and the rubber seal would support this observation.

I have looked through many standard thread size charts and have been unable to locate a match. I thought BSPP-16 was close enough (at 33mm) but when I tried, the BSPP plug was too large to fit the associated female thread.

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  • $\begingroup$ I'm assuming you can't contact the company who makes the part? $\endgroup$
    – JMac
    Jun 5, 2019 at 18:47
  • $\begingroup$ Are you able to say what type of equipment that the plug goes in to? $\endgroup$
    – user16
    Jun 5, 2019 at 18:55
  • $\begingroup$ @JMac I have not been able to get any information from the manufacturer. $\endgroup$ Jun 5, 2019 at 19:05
  • $\begingroup$ @GlenH7 This is the cap to a dry-sump oil reservoir for a Japanese-made HKS engine. I think the reservoir and this cap may have been an off-the-shelf solution from another manufacturer. $\endgroup$ Jun 5, 2019 at 19:08
  • 1
    $\begingroup$ That does not look like 11 threads per inch - "just" matches the right hand two, but the left hand looks to have an increasing space... $\endgroup$
    – Solar Mike
    Jun 5, 2019 at 19:50


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