RAW Rapid HM1000x Pellet Probe Grub Screw Size

[Air-15]

What size are the grub screws that hold the pellet probe on a HM1000x?

I measured the diameter of the screw and it was 2.72mm, so I ordered an m3 which measured to 2.83mm and it does not fit. Could the pitch be wrong? I feel like a m2.5 would be too small.

 

[Air-15]

Here's a pic of the two screws, the shorter screw is the correct one. I can see now that it's a different pitch but every m3 screw I can find says it has .5 pitch which is what the replacement was. Does anyone know what the coarse thread is called?

 

[nervoustrig]

Looks like it's probably a #4-40.

 

[Air-15]

Looks like it's probably a #4-40.

YOU'RE RIGHT! Thank you!

I actually ordered a 4-40 screw first just based on the hex key size the screw took but thought I was ordering an m4 which seemed too big when i measured the actual diameter of the grub screw 2.72. So I ordered an m3 and assumed the 4-40 was too small before receiving and trying it and was going to return the 4-40(which I thought was a m4).

Is a 4-40 an m4 or is it it's own thing?

 

[Dstrac]

YOU'RE RIGHT! Thank you!

I actually ordered a 4-40 screw first just based on the hex key size the screw took but thought I was ordering an m4 which seemed too big when i measured the actual diameter of the grub screw 2.72. So I ordered an m3 and assumed the 4-40 was too small before receiving and trying it and was going to return the 4-40(which I thought was a m4).

Is a 4-40 an m4 or is it it's own thing?

View attachment 595280

Standard American threads. Not metric

 

[Air-15]

Standard American threads. Not metric

ahhh...makes obvious sense. ty.