Class 12 metric washers? (also posted in structural)
Class 12 metric washers? (also posted in structural)
(OP)
Hello, I wasn't sure where best to ask this so I've also posted this in the structural forums...
My understanding is that to prevent creep, even at moderate temperature, it is desirable to use a class of washer that matches that of the bolt. In the past, we have used class 12 washers when needed, to match class 12.9 fasteners.
Recently, it has become difficult to obtain 12.9 fasteners, and all but impossible to obtain matched washers.
Is there a reason for this?
Does anyone know of a source for these parts? Our only option seems to be having a very small run of custom hardened parts made, and this is going to be costly.
Our previous suppliers now carry 10.9 only.
Thanks in advance for any help
My understanding is that to prevent creep, even at moderate temperature, it is desirable to use a class of washer that matches that of the bolt. In the past, we have used class 12 washers when needed, to match class 12.9 fasteners.
Recently, it has become difficult to obtain 12.9 fasteners, and all but impossible to obtain matched washers.
Is there a reason for this?
Does anyone know of a source for these parts? Our only option seems to be having a very small run of custom hardened parts made, and this is going to be costly.
Our previous suppliers now carry 10.9 only.
Thanks in advance for any help





RE: Class 12 metric washers? (also posted in structural)
RE: Class 12 metric washers? (also posted in structural)
We must have domestic sources for
inch size bolts and washers in a
higher grade. What sizes do you
typically order?
RE: Class 12 metric washers? (also posted in structural)
In the future, we are likely to limit ourselves to 10.9 wherever possible, since the 12.9 fasteners are becoming such a hassle
about 50% of our fasteners must be metric,