Failure Rates and Standard Acceptable Quality Level for Incoming Components

M

MattRamsle

#1
Does anyone know a standard Acceptable Quality Level for incoming device components? Our contract manufacturer assembles an electronic handpiece for us, but when we test them, we find that at least 10% of them fail. I’d like to negotiate an acceptable number of nonconforming components from my supplier, but wanted a benchmark to start from.
 
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J

John Nabors - 2009

#2
Re: Failure Rates for Incoming Components

Matt-

Most of my prior experience has been in automotive and defense and they are very different cultures. In automotive, zero defects were a way of life and at that company (large multinational Tier II), suppliers were expected to maintain PPM's as follows:

'Green' supplier (dock to stock): 0-25 PPM
'Yellow' supplier (normal sampling inspection required): 26-500 PPM
'Red' supplier (tightened sampling inspection required): 501-2500 PPM
'Unacceptable' supplier (discontinue use): 2501+ PPM

A discontinued supplier could slither their way back into our good graces by giving us really, really good 8-D's and then going back to square one of the supplier approval process.

It was different with the military contractors. Both only had suppliers of metals to worry about (about 98% was steel and titanium bar stock, the remainer was oddball stuff like aluminum extrusions) so most of the inspection activity was in-process and final acceptance, not SQD. Defense procurement designated all features as either Critical, Major, Minor, or Unlisted and we had to inspect (in the presence of a DOD procurement specialist, called a 'DCAS') to the old MIL-STD105E (now ANSI/ASQ Z1.4-2003) with the following criteria:

Critical: 100% inspection
Major: 0.65 AQL, Level II
Minor: 4.0 AQL, Level II
Unlisted: Did not require final inspection

But every organization needs to make their own risk/cost analysis and come up with their own 'comfort zone' for supplier quality.

Did any of that blather help?

Regards -John
 
M

MattRamsle

#3
Thanks John, that gives me a bit of a starting point. This particular supplier is the only one that would touch this job, so we're a little more flexible with them than normal. But we still don't like losing any more money that necessary.
 
C

CK lau

#4
Hi! Dear,

Can anyone provide me a table of ANZI 1.4 ? What's the different between ANZI 1.4 & Mil Std 105e?:rolleyes:

Thank you
CK:agree1:
 

harry

Super Moderator
#5
Hi! Dear,

Can anyone provide me a table of ANZI 1.4 ? What's the different between ANZI 1.4 & Mil Std 105e?:rolleyes:

Thank you
CK:agree1:
ANZI 1.4 is protected by copyright and is the civilian equivalent of Mil Std 105e. According to some of our covers, there are some minor differences. See this link, especially post#7.

Welcome to the cove CK.
 
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