Depth of a hole for a screw
Depth of a hole for a screw
(OP)
Hi there!
Here I bring an easy one, but I'm a beginner.
I'm connecting several parts to a sheet with screws.
The screws are ISO 4762 M8x25; the supported parts thickness is 11.6 mm.
I need to specify the depth of both holes and thread in the sheet. A V-Bottom will be included (120º).
In principle this sheet has a thickness of 20 mm. I would like to stick tot he value but it could be modified.
Attached a drawing to explain this better. (Distances A and B are related)
Thank you very much
PD: Sorry for the bungling thread representation!
Your file's link is: http://fi les.engine ering.com/ getfile.as px?folder= 904ca2f7-9 613-430b-9 2b1-b18a48 05c2aa& ;file=hole _depth.jpg
Here I bring an easy one, but I'm a beginner.
I'm connecting several parts to a sheet with screws.
The screws are ISO 4762 M8x25; the supported parts thickness is 11.6 mm.
I need to specify the depth of both holes and thread in the sheet. A V-Bottom will be included (120º).
In principle this sheet has a thickness of 20 mm. I would like to stick tot he value but it could be modified.
Attached a drawing to explain this better. (Distances A and B are related)
Thank you very much
PD: Sorry for the bungling thread representation!
Your file's link is: http://fi





RE: Depth of a hole for a screw
You have not specified any materials, or what you are trying to accomplish. Are you after maximum strength? Are you trying to control clamping forces? What control do you have over assembly process?
Most of this stuff is covered in machine design and fastener textbooks.
RE: Depth of a hole for a screw
Ted
RE: Depth of a hole for a screw
Ted
RE: Depth of a hole for a screw
Thank you for the reply; here my answer.
We will use steel screws on an aluminium sheet. We control (and do!) all the process of screwing. Also we have a workshop that will machine everything.
No after maximum strength.
I attach a picture to make it more understandable. The light green platform is the aluminium sheet. And then, on top of it, these other parts where one can see the screws (4 per piece).
Thanks again
Cheers,
Your file's link is: h
RE: Depth of a hole for a screw
What do you mean with the "lead of the tap"?
Thanks!
RE: Depth of a hole for a screw
Ted
RE: Depth of a hole for a screw
Peter Stockhausen ://www.lin kedin.com/ profile/vi ew?id=3006 4526&t rk=tab_pro
Senior Design Analyst (Checker)
Infotech Aerospace Services
www.infotechpr.net
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RE: Depth of a hole for a screw
RE: Depth of a hole for a screw
However, in this case, I think Brian may be nearer what you want as a thru hole may be better - if you can handle it.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Depth of a hole for a screw
RE: Depth of a hole for a screw
I write down all or your comments and I will cross check with the workshop.
Thank you very much
PS: chicopee (or anyone else). I was thinking about getting a mechanical handbook, any recommendation??
Cheers,
David
RE: Depth of a hole for a screw
B is simply the drill depth that would comfortably give you full thread engagement. I like something like 3 threads beyond C, so that would put B = 31mm.
Dimension A does not matter. It is a natural consequence of full shoulder drilling to point B. Only B and C are important relative to your 25 mm screw shank length.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada