metric zerks

[case580c]

I am having trouble finding what the difference or the meaning of a M8 x 1 vs a M8 x 1.25 Grease Zerk fitting. What does the last number mean (the 1 vs 1.25) is it the length of the thread or the cut or taper of the thread ? Thanks

 

[RickB]

Thread pitch.

 

[KWentling]

Yes. Think fine thread verses coarse thread.

Thread pitch.

 

[case580c]

Thanks everyone