2004 Nissan Xterra automatic transmission. Was trying to install an Autometer Trans Temp into the fluid pressure test port... realized that OE test port plug bolt is M10 x 0.9 thread?? Never even heard of that pitch for an M10... usually extra fine is M10x1.0

My trans temp sending unit is 1/8 inch NTP, was able to get an M10x1.0 adaptor, which I was certain was going to work, but alas. Any ideas??

In case folks don't believe it's 0.9 and not 1.0, here is the bolt: enter image description here

I also tried to thread a new M10x1.0 bolt in and it didn't want to go in at all. So yes, definitely 0.9!

  • Are you sure it's M10x0.9? I think it's more likely the standard M10x1.0.
    – jwh20
    Commented Apr 7, 2020 at 14:47
  • Take the port plug to the hardware store and have the threads measured.
    – Moab
    Commented Apr 7, 2020 at 20:15
  • Yes, I'm sure it's 0.9. Added picture with thread-meter to my post. I even tried to thread in a new M10x1.0 bolt thinking I was crazy and it was just going to work but it didn't want to go in at all.
    – wild.coast
    Commented Apr 8, 2020 at 8:13

1 Answer 1


Since the plug is tapered it is no M10x1.0.

I think it is a 1/8 BSPT: 0.907mm pitch, 9.728mm outer diameter and tapered.

NPT to BSPT adapters are widely available at car part shops.

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