On 11/11/22 3:22 AM, Rob Atkinson wrote:
More up to date info:
https://www.energy.gov/sites/default/files/2022-05/Fastener-Headmark-List-2022.pdf
https://www.standards.doe.gov/standards-documents/1200/1221-bhdbk-2016/@@images/file
On Fri, Nov 11, 2022 at 5:12 AM Rob Atkinson <ranchorobbo@gmail.com> wrote:
Lots of sources given for s.s. hardware but little on how to tell if
the stuff is dependable. Before I retired, I worked for a DOE
contractor and I recall there was a lot of concern over sourcing
quality metal parts. A lot of money can be wasted if inferior
hardware is used, or worse, serious injury in some cases. So, there
was training. Here's a manual they used:
https://www.energy.gov/sites/prod/files/2014/06/f16/SCI_Training_Manual.pdf
73
Rob
K5UJ
The challenge is that "high quality" counterfeits will be marked and
*look* right, so it's difficult to inspect, especially for the casual
buyer of small numbers.
Ultimately, it comes down to "trust your retailer"
One can ask for traceability to the mfr
One can ask for a certificate of conformance
This is the kind of thing you won't get at, say, Home Depot or Lowes.
It's something you might get at a fastener supplier (like McMaster or
Allen) - they'll typically provide a CoC, but mfr trace I'm not sure.
The other approach (if you're going to use a bunch) is to buy a batch,
and test a couple out of the batch. You'd want to be sure that the batch
is all from the same mfr & lot, in some way. Maybe they come in a sealed
box with the manufacturer's name (as opposed to the retailer).
It's a real problem.
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