Clearance for various hex head nuts and bolts
Clearance for various hex head nuts and bolts
(OP)
Does anyone know where I may find values for the clearances needed to assemble hex-head fasteners?
For instance, if I have a M6 hex head nut that is going in a plastic molded piece, how large should I make the diameter of the cavity so that the technicians may assemble the nut in place?
For instance, if I have a M6 hex head nut that is going in a plastic molded piece, how large should I make the diameter of the cavity so that the technicians may assemble the nut in place?





RE: Clearance for various hex head nuts and bolts
Regards,
Cory
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RE: Clearance for various hex head nuts and bolts
I think the machinery's handbook gives clearances around hex head fasteners for assembly purposes.
regards
desertfox
RE: Clearance for various hex head nuts and bolts
Cory's suggestion is completely valid. Take a quick walk around your shop and start measuring the tools your technicians will use to assemble your products. Tell them what you're up to and you may learn something about how they plan on assembling your creation that can help you with the design. At the very least they'll know you were thinking of them during the design phase rather than just throwing something over the wall and saying "build this!"
RE: Clearance for various hex head nuts and bolts
Regards,
Cory
Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.
RE: Clearance for various hex head nuts and bolts
ASME Y14.5M-1994, the dimensioning and tolerancing standard, shows how to analyze clearance holes and position tolerances to ensure your parts can be assembled.
JHG
RE: Clearance for various hex head nuts and bolts
I'll have to look into the Machinery's Handbook. Anyways, I am doing this for my technicians, I just didn't want to bother them every couple of hours with these kind of questions and wondered whether there was a chart.
Once more thanks again
WJM
RE: Clearance for various hex head nuts and bolts
-Dave
Everything should be designed as simple as possible, but not simpler.
RE: Clearance for various hex head nuts and bolts
You then need to allow for the fact that the size and location of the bolt hole vary and that hence the position of the bolt head will move. Depending on your application they may move a little or a lot, depends on the tolerances of the part(s) involved. This is what drawoh is telling you.
Cory, depending on not just the sizes but the relevant postional tol/coaxiality of the bolt holes the .03 doesn't sound generous to me.
KENAT, probably the least qualified checker you'll ever meet...
RE: Clearance for various hex head nuts and bolts