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metric hardware call out 1

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PROEGUY

PROEGUY

Mechanical
Dec 21, 2000
24
i'm still working on our "mil-spec" metric hardware library so forgive me if it sounds as if i'm beating a dead horse...
is this syntax acceptable for a metric callout in a BOM?

DIN912_M3X1.5X8L SHCS, ALLOY STEEL PLATED

i'm trying to mimic the US mil spec syntax call out, i.e.
MS16995-1 SHCS, .086-56 UNC-3A X .188L

TIA

Sr. Pro/E Mechnaical Designer
 
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PROEGUY,

I hate acronyms. I understand DIN912 and, probably, I would have figured out SHCS. What happens when this specification is handed to a non-technical office clerk with instructions to order the thing? Where does one go to order a DIN912_M3X1.5X8L SHCS, ALLOY STEEL PLATED?

Even the person doing assembly may not be able to make enough sense of your description to identify your part. Requisitions and MRP entries ought to be generated by copying and pasting off of your BOMs.

A long time ago, I saw a newspaper article by a guy who He was was trying to assemble some product he had bought. The instructions refered to something called a LED, and he had no idea what a LED was.

Eschew obfuscation!

Also, I would systematically not use commas in my part numbers and descriptions. At some point in time, someone may have to transfer your BOM data in comma separated format (.CSV), popular with spreadsheets. Your BOM entry will break this.

Critter.gif
JHG
 
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maybe i wasn't clear enough..sorry

the CAD part file name is: DIN912_M3X1_5X8L
correction to orginal post...can't have a period in a file name

and the description is: SHCS, ALLOY STEEL PLATED

does this help a little?

Sr. Pro/E Mechnaical Designer
 
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Poeguy - Where do you find M3x1.5????????
BOM fort SHCS :DIN 912 M3x8 8.8

Expl.: DIN 912 = SHCS with inside socket.
M3 = metric coarse (M3x0.5). Only metric fine thread requires a pitch.
8 = length
8.8 = class

 
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I'm still wondering why you would want to plate it with alloy steel...

"Good to know you got shoes to wear when you find the floor." - [small]Robert Hunter[/small]
 
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Proeguy - Class 8.8 could be 10.9 or 12.9 depending on your requirement.
 
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i'm just try to get a feeling for the syntax only not wheather there is such an object. lets try this:

DIN912_M3X0.5X25.4L
SHCS, ALLOY STEEL

Sr. Pro/E Mechnaical Designer
 
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DIN 912 is obsolete. Replaced by ISO 4762.

ISO 4762 defines Steel Socket Head Cap Screws with Metric course threads.

So if you are going to include the specification reference in the call-out:

"SHCS" is redundant.
"ALLOY STEEL" is redundant.
Thread pitch is redundant.

 
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PROEGUY,

They don't make metric screws 25.4mm long.

The questions about alloy steel plated are stupid, in this forum. Your purchasing people will be trying to figure out how to plate your screws with alloy steel.

How about...

CAP SCREW HEX SOCKET ISO4762 STEEL 12.9 ZINC PLATE M3X0.5X25

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JHG
 
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thanks anyway

Sr. Pro/E Mechnaical Designer
 
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Why do engineers so value brevity over unambiguity?

Socket Head Cap Screw M3x30, Grade 12.9 per ISO 4762 Zinc Plated per ASTM 636, SC II, Yellow Chromate.

Somebody could actually use that to buy the thing.

 
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Quoted from DIN 912 ISO 4762 modified:
Hexagon socket head cap screw ISO 4762-M12 x 60 - 12.9
 
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MintJulep,

I write descriptions that fit within a database field of 30_characters for the description and 30 for the part number. I am not sure of how our MRP people identify the manufacturer. If it had been my call back then, there would have been one field 60_characters long.

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JHG
 
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Hmmm, this is going askew fast. This is nothing more than a simple "DESCRIPTION" or "TITLE" question. In which case, this falls under ASME Y14.100. First, say what it is, then add modifiers that provide more detail in the order of importance. It helps to read it backwards. Commas are important, but I understand why some have issues with them during the translation process.

It's plated alloy steel 8mm long M3X1.5 socket head cap screw.
Depending on what information you value, this can be broken down a few different ways (all being correct as long as you maintain this convention thoughout your organzation):

SCREW, SOCKET HEAD CAP, M3 X 1.5, 8mm LONG, ALLOY STEEL, PLATED

SCREW, M3 X 1.5, SOCKET HEAD CAP, 8mm LONG, ALLOW STEEL, PLATED

CAP SCREW, SOCKET HEAD, M3 X 1.5, 8mm LONG, ALLOW STEEL, PLATES

By maintaining a convention, such information can then be searched upon much easier if you sort the BOM. You see all the screws fall out together and sort them in order of what you find most important.

I would put the DIN912 into a separate colume, but if you are tring to mimic another convention where it is in the desc at the front, then simply add it there.

Matt Lorono
Lorono's SolidWorks Resources & SolidWorks Legion

http://groups.yahoo.com/group/solidworks & http://twitter.com/fcsuper
 
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PROEGUY, have you looked closely at 14.100, especially section 5 and if you choose appendix c?

If you decide to invoke appendix C, I think you'll find that you shouldn't use an abbreviation for the first word of a description, C-6.1.

Also, if you're going to use abbreviations I strongly suggest basing them on ASME y14.38 or equivalent.

SHCS is not in Y14.38-1999 that I see.

The abbreviation for socket head is SCH.

So, I'd use 'SCREW, SCH' as the first part of my title.

I like the idea of referencing a spec, just make sure it's the correct current spec.

Posting guidelines faq731-376 (probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​
 
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