Max Screw Size Relative to Width
Max Screw Size Relative to Width
(OP)
So I wasn't sure where to post this. Is there a machining forum? If there is I must have missed it.
Anyway, I've found lots of info on the minimum thickness of a material to be tapped but I haven't found anything regarding how wide the material should be.
In other words, how much material should be present on any side of the hole as a basic guideline? Like a 10-32 Screw in .25" material seems a bit sketchy. Thoughts?
Anyway, I've found lots of info on the minimum thickness of a material to be tapped but I haven't found anything regarding how wide the material should be.
In other words, how much material should be present on any side of the hole as a basic guideline? Like a 10-32 Screw in .25" material seems a bit sketchy. Thoughts?





RE: Max Screw Size Relative to Width
Most bolts, screws, etc have minimum "edge/end distances" and "spacing" dimensions. That would be your answer.
Check w/ supplier.
RE: Max Screw Size Relative to Width
Anyway, after poking around on McMaster for a bit(where most of our orders come from) there doesn't seem to be much advice on edge/end or spacing distances. Even google has failed me. Are there any rules of thumb I should know about?
Thanks!
RE: Max Screw Size Relative to Width
Ted
RE: Max Screw Size Relative to Width
RE: Max Screw Size Relative to Width
RE: Max Screw Size Relative to Width
How many are there?
Is it a compressive load?
Is it mostly shear or is it cantilevered?
Is it plastic, aluminum, steel, brass?
Is it tapped deep? is it tapped straight?
Is it holding on a plate, a cover or is it hanging a load?
There are no rules for this, you have to do an analysis on the principles
Charlie
www.facsco.com
RE: Max Screw Size Relative to Width
RE: Max Screw Size Relative to Width
A 10-32 UNC-2B thread is drilled 5/32 and tapped to depth. You get 5/32 drill diameter by noting the nominal thread size of a #10 male thread is 0.19 inches and subtracting 1/32 off and rounding to the nearest 1/64th inch. Hence 5/32 drill diameter.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
RE: Max Screw Size Relative to Width
Bolts or screws should be placed at least 1.5 to 2 times bolt or screw diameter to avoid failure by tearout see this link-
h
look at chapter 10
regards
desertfox
RE: Max Screw Size Relative to Width
Most machine design texts will address this quite well...
usually 2 diameters work, check bearing stresses, tensile rupture, and shear tear-out.