Quantity Discrepancy Tolerance Standard(s)?

RCasey88

Quality Assurance Representative
#1
Hello All,
Here lately Ive been having a lot of issues recieving PO's from supplier with more or less pcs than what was on the PO. Its getting a bit out of hand and I , along with suppliers, are constantly revising our paperwork to match the actuals and its too much of a hassle and taking up to much time. One of my suppliers actually informed me that the "Industy Standard is 10% +/-" Is this accurate? Another supplier has a statement on their packing lists that there is a 5% +/-. I truly find this hard to believe especially since its a daily ordeal. If it is true, than I would like help in finding where that standard is. It would be greatly appreciated.
 
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Sidney Vianna

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Admin
#2
It always helps if you give some context of the products in question. Are we talking electronic components, fasteners, COTS, etc...?
 

Jen Kirley

Quality and Auditing Expert
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#4
I have not heard of an industry +/- 10% standard for delivering what has been contracted to purchase.

RCasey88 raises a good point: is it a large quantity of inexpensive items that are counted by weight? If so, there is very likely variation but if this was the case I would wonder about their scales...

What does your contract say, if there is one besides your purchase orders? These are the governing documents, not some anonymous "+/- 10%" standard - or even 5% stated on packing lists.
 

Sidney Vianna

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#5
In this day and age of stressed supply chains, some companies are just playing silly games, especially when they know their customers have nowhere to go in the short term. Since this post was entered under the AS9100 forum, I will understand that such items are safety-critical, despite possibly being COTS. In my mind, this type of discrepancy is serious. Repeat offenses should be treated via supplier corrective actions and, if it persists, a new supplier should be developed.
 

Tidge

Trusted Information Resource
#6
± 10% seems large to me (for mechanical components)... I suppose it is possible for some classes of components that there is a dimension that doesn't matter (or isn't specified) that has a wide allowable variance (for example, I think that for extruded plastic pipe the outer diameter is strictly specified, but that the wall thickness is simply a minimum for the schedule) but I'd check the reference standards for the components where you are seeing the variability.

I did a quick check of a 2000 copy of ASME B18.8.2 (table 1), and the commercial class size 4 taper pin has an average diameter of 0.2500 with a max diameter of 0.2513 and a min diameter of 0.2493. The nominal length has a tolerance of ± 0.010 inches.
 
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