huangyhg

material specifications?
as a drafter i am given redlines from the engineers and asked to create and detail the part. one area where i struggle is finding the correct specification for the material being called out on the drawing.
my question is, are there any helpful websites that offer specifications callouts for metals (i.e aluminum 6061, cres 303)?
example:
steel types 304 and 304l stainless steel
steels are covered by the following
specifications:
type 304 type 304l
ams 5513ams 5511
astm a 240 astm a 240
astm a 666 astm a 666
thank you.
check out our whitepaper library.
check:
cadfreak,
the specification of the material on the drawing should fully define the requirements necessary for the design. for instance: 304l is more suitable for welding than 304. thus, unless you are not welding or the low carbon requirement of 304l is not required, you may call out the two materials.
the next step is finding the standard that will meet your application. you can go to matweb to match a material with a standard, but that is just the beginning. you may also use
a metal suppliers stock list and data book (i.e. ryerson) is also an excellent reference. i've had one in my possesion as long as i've had a machinery's handbook.
believe it if you need it or leave it if you dare.fff"> - robert hunter
get yourself a copy of mil-hdbk-5.
wes c.
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one additional comment. be as specific <em>as necessary</em>. if you are working in a field or on a project where exact material specification is not necessary, i would avoid being over specific. this allows the vendor to use what they have on hand, often reducing costs and delivery aro to you. this is useful if you don't have significant loads to detail with or when breadboarding something for a proof of concept.
matt lorono
cad engineer/ecn analyst
silicon valley, ca
i have been in your position before...
get a hold of a couple of mcmaster carr catalogues...one for you, and maybe a couple others that you can use as 'handouts' if there seems to be anybody that 'has a need to know'.
anyway, the mcmaster carr catalogues have pretty good descriptions of the materials they offer, along with relative pricing for the materials you are considering. also important is whether or not the material you actually spec is available or not in the stock (unmachined)size that you need. (don't assume that just because you have a name for a material, that it is available on the size that you need).
the material definitions as listed in mcmaster carr have always served me well in my twenty years of design work, but i've never taken my drawing specs to the mil spec level or any other similar specification.
(as a slight aside, i've also used the mcmaster carr catalogue as a reference for different types and grades of fasteners)
i hate having purchasing come back to me as a designer saying 'we've looked all over for what you spec'd and can't find it'
(fyi - i have no interest in mcmaster carr)
if you want a mcmaster catalog you better know people because they are a bunch of nazis when it comes to giving them out but it's available on the web.
their site is down, but they have great lierature that you can request that has all of the info you need.
keep checking for their web site, or search for their phone no.
this is a question that should be answered as a department. engineers should be involved. it is a decision that should become a departmental standard to which all can refer.
quote:
get yourself a copy of mil-hdbk-5.
or get a copy of faa - metallic materials properties development & standardization document that has replaced mil5.
when you're calling out material specs on your drawings do not put the revision of the spec in the callout. as an engineer i am responsible for interpreting the design requirements and flowing them down to designer and drafter.
heckler
sr. mechanical engineer
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this post contains no political overtones or undertones for that matter and in no way represents the poster's political agenda.

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