Hex Nuts have Debris in them? Is this normal? 3

[Cervantis]

We purchase a MILD STEEL 1/2-UNC 2B Hex Nut from a reputable supplier. We do not spec a GRADE of Nut. The nuts are getting complaints that there is "debris" in the threads. I cant find any information that states or discusses the "allowable" amount of "specs" or fine tiny bits of metal allowed. Does anyone know if ASTM A 563 addresses allowable bits of debris in the various GRADES. Logic tells me you get what you pay for, so I am not logically expecting a pristine clean nut. The nuts pass a thread gage, but I have had to tap the nut while on the gage to allow the nut to freely move, and have notice fine grit on my gage. The nuts are pickled in oil.

 

[JohnRBaker]

Time to find a new vendor.

John R. Baker, P.E. (ret)
EX-Product 'Evangelist'
Irvine, CA
Siemens PLM:
UG/NX Museum:

The secret of life is not finding someone to live with
It's finding someone you can't live without

 

[MikeHalloran]

If you don't issue or reference a cleanliness spec, you get what you get.

In a commercial environment, we used to use MS numbers for fasteners, and tell our vendors we didn't care about the packaging and inspection requirements, we just wanted stuff to fit.

Our assemblers were told to just discard any unthreaded screws, and squawk over the wall (to me) if anything required more labor than that.



Mike Halloran
Pembroke Pines, FL, USA

 

[ornerynorsk]

Unless you own stock in the gauge manufacturing company, I'd probably be cleaning up those nuts before you run the gauge on them.

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

 

[ctopher]

I agree, find a new vendor.
They obviously don't care about quality.

Chris, CSWP
SolidWorks '16
ctophers home
SolidWorks Legion

 

[monkeydog]

Why not put in your PO, nut are to be visibly clean, free of oil and debris
Expand on lighting, how close you look (18 inches) and magnification as you feel you need to.

 

[MintJulep]

No, ASTM A 563 does not have anything about "debris".

 

[Cervantis]

Thank you to everyone who replied. I have a better understanding, and have gotten with our vendor to resolve the issue.

 

[1gibson]

Issue non conformance to supplier, go gauge won't go due to debris in threads. Return for cleaning or backcharge for your cleaning labor.

Your complaint isn't that they got your hands dirty, it's that you can't inspect / they fail inspection as received.

 

[chicopee]

Chase the treads.