RAW Rapid HM1000x Pellet Probe Grub Screw Size

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tempFileForShare_20250920-201100.jpg


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?
 
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nervoustrig said:
Looks like it's probably a #4-40.
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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?

tempFileForShare_20250920-204329.jpg
 
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Air-15 said:
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
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Standard American threads. Not metric
 
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