a M <vs> an M

[PlaneCrazy]

Greetings, all

I am reviewing a technical paper before its final issue, and I am getting conflicting input regarding the use of a thread cutting tool.

Should it read "a M12 die" or "an M12 die"?

Thank you

 

[sdgraham]

Well, do you think "em" has a vowel sound when spoken? (as in "em-12")

As you say, it's an old question, including: an examples book vs a examples book

 

[Giorgio Spizzi]

Hullo.

I don't know what "an M12 die" is but if you pronounce M /em/, I'm pretty sure you should use "an".

GS

EDIT: Cross-posted with sdgraham.

 

[PlaneCrazy]

Yes, it is indeed an "em-12 die".

Thanks