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 Apr 7 at 14:47
  • Take the port plug to the hardware store and have the threads measured. – Moab Apr 7 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 Apr 8 at 8:13

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.

| improve this answer | |

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.