# RE: Metric Steel Shapes

• To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
• Subject: RE: Metric Steel Shapes
• From: "Fredericks, Douglas/SAC" <DFreder1(--nospam--at)CH2M.com>
• Date: Wed, 12 Jul 2000 17:05:13 -0600
```On the first metric job we did, I estimated the rebar weight and converted
it from english (good old lbf) into Newtons.  Made sense to me - switch
force for force.  Luckily someone caught it before it went out.  Then I got
to thinking about how metric scales (like a bathroom scale) read out in kg,
even though they are really measuring a force on a spring and converting the
force by a standard g value (I suppose 9.81m/s^2) to get mass.

So....If you had a \$1,000,000 steel job you would save \$250 if you bought
the steel in Denver Colorado rather than in San Francisco CA, right?

-----Original Message-----
From: Charlie Carter [mailto:carter(--nospam--at)aiscmail.com]
Sent: July 12, 2000 11:05 AM
To: 'seaint(--nospam--at)seaint.org'
Subject: RE: Metric Steel Shapes

>Obviously (for the S100x11 metric = an S4x7.7 imperial) the
>100 is millimeters which is approximately 4 inches.
>But how does the 11 relate to 7.7 plf?

11 kilograms per meter is equivalent to 7.7 pounds per foot. The metric
series uses mass (not weight) per meter in the designator. In the U.S.
customary system gravity is applied (changing mass to weight) and the length
measurement changes as well to feet. The conversions for mass to weight and
meters to feet results in a divisor of 1.5 to get from metric to U.S.
customary units.

Charlie

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