Take me to hardware school please
Take me to hardware school please
(OP)
I've been noticing on some outline and installation drawings for electronic equipment onboard a ship the specification of -2A bolts and -3B self locking nuts for hold-down. The originator is not available to consult.
Are class 3 nuts typically used with class 2 bolts. Why or why not?
Are grade 5 bolts usually class 3 or could they be class 2?
Thanks,
Dan
Are class 3 nuts typically used with class 2 bolts. Why or why not?
Are grade 5 bolts usually class 3 or could they be class 2?
Thanks,
Dan





RE: Take me to hardware school please
Looked into this a while back up to a point, -2A bolts will work with -3B nuts. The fit will be a little 'tighter'/more precise than 2A & 2B but looser than 3A & 3B.
Doesn't really answer your question though. We use class 3 for a lot of fine adjustment screws, not sure this is applicable to your situation though.
KENAT, probably the least qualified checker you'll ever meet...
RE: Take me to hardware school please
Meanwhile, I've found a Grade 8 class 2 bolt specified. Is that one available? I thought the stronger the bolt, the tighter you wanted the fit--thread bearing surface deformation and all that.
There's a lot of inconsistency in what I'm looking at because it came in parts from a dozen or so places. I'm beginning to think the designers were no more qualified to spec hardware than I am.
Thanks again,
Dan
RE: Take me to hardware school please
Class 3 allow a line fit at max tol which doesn't work well with any contamination etc.
KENAT, probably the least qualified checker you'll ever meet...
RE: Take me to hardware school please
RE: Take me to hardware school please
Dan
RE: Take me to hardware school please
This site will allow you to get a ballpark stress figure if I recall correctly.
http://www.boltplanet.com/default.asp
KENAT, probably the least qualified checker you'll ever meet...
RE: Take me to hardware school please
Certainly, with a wide enough and thick enough washer under the bolt head.
Of more concern to me is the (apparent) contact between steel and aluminum in a marine environment with no (apparent) concern for galvanic corrosion.
RE: Take me to hardware school please
btrueblood, we're inside in a well air conditioned space--very well air conditioned.
Dan
RE: Take me to hardware school please
od washer to prevent embedding the washer into the aluminum if you are using the full clamping force of the grade 8 bolts.