The times you absolutely want to use a weaker bolt are when you want the bolt
to fail before the part its bolted to fails. An example of that would be on a
plowshare
used to till the earth. Plow bolts are soft so that if the plowshare hits a
large rock
the bolt breaks and the plowshare is undamaged (kinda expensive). You then
remove the rock and bolt the plowshare back on.
The other times I can think of to use a milder (cheaper) bolt are when the are
not necessary. For example, it would be silly overkill to use grade 8 bolts to
hold the radio in, or to bolt the glovebox door on with. In that case, a very
mild fastener would be perfectly adequate.
To that end, there are fasteners that are phenomenally expensive, and
far stronger then mere grade 8, but aren't used because grade 8 is strong
enough, and the expense isn't worthwhile.
>>> <LBC286@aol.com> 09/25 9:41 AM >>>
OK, here goes the bolt strength thread (no pun intended) again.
On another list there is a heated discussion about using all grade 8 bolts on
restoring a car. Can anyone give me a simple explanation as to why it may or
may not be a good idea to replace grade 5 with grade 8?
Part deux: What about Bowmalloy bolts, from Bowman? They are higher
strength than grade 8, according to Bowman. Anybody know about these?
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