This coach bolt was bought as m12, shouldnt it measure 12mm diameter?

[Gary111]

It measures 10mm at the widest point as far as I can see, and around 9mm on the unthreaded part.

 

[freddiemercurystwin]

Coach bolt or coach screw? I'm guessing screw as I wouldnt have thought you'be be able to measure the smaller diamter on a bolt with that type of gauge.

 

[Gary111]

Thanks for your answer, it's a coach bolt

 

[Gary111]

Pic attached

 

[JohnD]

They have sent you an M10

"The "M" designation for metric screws indicates the nominal outer diameter of the screw thread, in millimetres. This is also referred to as the "major" diameter."

ISO 965 - Wikipedia

en.wikipedia.org

 

[Gary111]

Thanks