Drafting Standards

[Hoosier1]

Is there a ASME standard for abbreviating metric cm or CM?

 

[BARM]

American National Standard Symbols for Mechanics (ANSIY 10.3.1968) as presented in Machinery's Handbook 22nd Edition

Centimeter=cm

 

[KENAT]

While the standard BARM references is the final say, simplistically with metric units...

If the unit is named after a person it's a capital, eg J for Joules and N for Newtons.

Otherwise it's lower case, eg m for meter/metre and s for second.

As regards multipliers, the case also has significance k for kilo M for mega, m for mili etc.

So even on drawings meters are m, kilometers are km and millimeters are mm.

KENAT, probably the least qualified checker you'll ever meet...

 

[CheckerRon]

ISO 1000 and ASTM E380 both deal with SI units, and they back up the rules of thumb that KENAT sited above, e.g.
P for Pascals

 

[gearguru]

I think that Pascal = Pa

 

[CheckerRon]

That's right, but the point is, that it is capitalized.

 

[WHITMIREGT]

According to the U.S. Metric Association, Pascal is Pa

 

[gearguru]

CheckerRon: M (for mega as in MPa = megapascal) is capital too and it is not derived from a name of a person. When working with units we have to be accurate.

 

[KENAT]

gearguru, Ron was responding to my post in which I made the point about multipliers being case sensitive. He is well aware of this.

KENAT, probably the least qualified checker you'll ever meet...

 

[gearguru]

Sorry!