We just bought a '69 Toyota Land Cruiser (FJ40 hardtop, for those
who care). It's in good shape, but there are some little things I"m
discovering as I go through it.
One of these mysteries is the set of bolts that hold the two hooks
to the front bumper. I had this apart today to lube the steering and
found the bolts too short and rusty - so I want to replace them.
SOR (one of the places that shows them in their on-line catalog)
lists the bumper hook bolts as "grade 5". The bolts that
are in there are marked "5" (literally - not three lines). They were yellow
plated once, not normal zinc (cad? definite yellow tinge).
I used a 17mm wrench to get them off... but for all I know, it's really
an 11/16". Except that there aren't any SAE bolts with that head size.
I'm too lazy (and clean) to go take them off again to measure the threads.
So it must be an M10 bolt of some sort (apparently DIN sized, for 17mm).
Was there a time when metric bolts were graded just "5"? I know there's
a property class 5, but that's a seriously soft bolt (but then, maybe
this is meant to be the shear point in the system - and there
are two of them).
Very weird. Maybe these *are* the original bolts. They're too short
barely extending through the hex nuts and lockwasher.
They also have the bumper bearing on the threaded
portion. I'd be happier here with AN-style engagement, a flat
washer and a nyloc - but I suspect that AN bolts are too hard (not
to mention the wrong system). DIN bolts seem to have longer threaded
sections.
Thoughts? I see that Metric MultiStandard has zinc yellow plated 8.8
bolts. Dunno if they actually have nylocs ... but I know they have some
sort of self-locking nut (I think the DIN style is the slightly
off-round all metal?)
Will 8.8 be "too hard"? And what was this "grade 5" anyway?
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