"Parts List" vs. "Bill of Materials"
"Parts List" vs. "Bill of Materials"
(OP)
"Parts List" vs. "Bill of Materials"
This may be just a matter of opinion but I would be glad of any responses.
Is there a difference between a "Parts List" and a "Bill of Materials", or are there differences between the two, even if only subtle in nature?
Does it depend on the context in which the two terms are used, or the area (mechanical, electrical, civil engineering etc)
Thanks
This may be just a matter of opinion but I would be glad of any responses.
Is there a difference between a "Parts List" and a "Bill of Materials", or are there differences between the two, even if only subtle in nature?
Does it depend on the context in which the two terms are used, or the area (mechanical, electrical, civil engineering etc)
Thanks





RE: "Parts List" vs. "Bill of Materials"
"I think there is a world market for maybe five computers."
Thomas Watson, chairman of IBM, 1943.
Have you read FAQ731-376 to make the best use of Eng-Tips Forums?
RE: "Parts List" vs. "Bill of Materials"
RE: "Parts List" vs. "Bill of Materials"
RE: "Parts List" vs. "Bill of Materials"
NOTE: Other terms previously used to describe a parts list are: list of materials, bill of materials, stocklist, and item list."
These are just two different terms for the same thing per the industry standards. But, if does not mean that there are not companies out there who have tried to define them as differnt things as noted by some of the earlier responses.
GDT_GUY
RE: "Parts List" vs. "Bill of Materials"
A BOM is often referred to as an "indentured parts list," which is consistent with the definition of "indentured data list" referenced in Y14.34 Section 3.
TTFN
RE: "Parts List" vs. "Bill of Materials"
parts list (PL): a tabulation of all parts and bulk matenals, except those materials that support a process and are not retained, such as cleaning solvents and masking materials, used in the item.
(a) integral parts list: a parts list prepared and revised as part of an engineering drawing. See Figs. 2 and 3.
(b) separate parts list: a parts list prepared as a document separate from the engineering drawing to which it is associated and one that may be revised independently of the drawing. See Figs. 10A and 1OB.
NOTE: Other terms previously used to describe a parts list are: list of materials, bill of materials, stocklist, and item list.
The "top to bottom" listing is referred to as an indentured data list. A definition is provided for that as well which reads:
indentured data list (ID): a data list showing the documents for a complete system or end item in a top-down (generation tree) order. See Figs. 8A and 8B.
But, like I said, different companies have applied different means to some of these terms. So, there will probably be a lot of people who have a different take on this one.
I'm just passing along what the industry standard says on the subject.
GDT_GUY
RE: "Parts List" vs. "Bill of Materials"
Chris
Sr. Mechanical Designer, CAD
SolidWorks 2005 SP0.1
RE: "Parts List" vs. "Bill of Materials"
Cheers
Greg Locock
RE: "Parts List" vs. "Bill of Materials"
A Parts List would not normally include sealant, adhesives, coatings, etc.
A Bill of Materials should list all materials and not just the Parts.
An Indented Parts List would list all of the Assemblies and their Sub-Assemblies, but not all of the Materials.
A Parts List is to select what parts to order, including hardware.
A BOM is a purchasing tool to get everything necessary to assemble the parts. A BOM might even list special toos required, if they need to be purchased.
Rerig
RE: "Parts List" vs. "Bill of Materials"
RE: "Parts List" vs. "Bill of Materials"
rmw
RE: "Parts List" vs. "Bill of Materials"
parts list- A listing of all components used in the production of a parent item that does not reflect its structure or intermediate levels, and is not useful in time- phasing requirements based on lead time offsets.
bill of material (BOM)- A structured list of the items used in making a parent assembly that reflects the actual production process in terms of timing and quantities consumed. It is constructed in conjunction with the routing, which describes the individual production steps and rates used. A BOM may optionally include information relating to backflushing, use of alternate and optional components, tie between components and the operations that use them, and other data. BOMs are used by the MRP function to calculate component requirements when given a parent demand, and in building product costs. (Syn: product structure, recipe, formulation, ingredients list)
Found them in the links below;
http://www.bridgefieldgroup.com/glos7.htm
http://www.bridgefieldgroup.com/glos1.htm#B
fwc
RE: "Parts List" vs. "Bill of Materials"
But, the terms "BOM" and "PL" or "IPL" are quite unique when you talk to manufacturing engineering types (which I've been doing a lot of lately), aka resource planners, aka shop (production) controllers, who have a lingo of their own to sling. These are the people who spend hours/days/years programming lots of petty little details into insufferably non-user-friendly software packages that are intended to make their lives easier. To them, you'd better not mix your terms because the differences can be pretty significant.
Interesting posts, though.
RE: "Parts List" vs. "Bill of Materials"
I agree with you mostly. We have parts lists attached to your engineering drawings. Our MRP department has BOMs. We could just as easily have done it the opposite way. In house here, we do have to make a distinction.
In addition to these, I attach "material lists" to fabrication drawings to call up everything our fabricator orders. SolidWorks cannot tell the difference between these and a parts list or BOM, but at least, we are clear about which list we are talking about.
All of this is absolutely arbitrary.
JHG
RE: "Parts List" vs. "Bill of Materials"
BOM is usually lists the material that is being quoted by a vendor. Bill of material may include complete assemblies such as a compressor, window air conditioner, a meter.
Where as a part list could be and normally used for listing parts need, included or recommened for maintainig an assembly or system. It may say an oil filter, air filter, belts etc..which other wise may be included for a compressor (I made this example up, do not point out my techical deficiency in a comrpessor).
Another example, BOM may include a car, but parts list will include a tire, light bulbs, wipers etc..
I think, it is not what is in the list but what the list is used for.
RE: "Parts List" vs. "Bill of Materials"