Large diameter washers and hole+bolt sizes ?
Large diameter washers and hole+bolt sizes ?
(OP)
Hi
What size large diameter washer can I use with which right hole+bolt combination without bending/deforming the large washer ?
I'm talking about those small hole washers that have large outside diameter and tend to bend/turn conical when used in too large holes...and wondering what is the right size washer+hole+bolt combination to use without deforming the washer ?
I have a bolt size 8mm and hole is 14mm so which washer size do I use 16mm or 24mm ?

What size large diameter washer can I use with which right hole+bolt combination without bending/deforming the large washer ?
I'm talking about those small hole washers that have large outside diameter and tend to bend/turn conical when used in too large holes...and wondering what is the right size washer+hole+bolt combination to use without deforming the washer ?
I have a bolt size 8mm and hole is 14mm so which washer size do I use 16mm or 24mm ?






RE: Large diameter washers and hole+bolt sizes ?
RE: Large diameter washers and hole+bolt sizes ?
You are going to have to work this one out. Roark's has equations for flat round plates. You can figure out the screw torque and the washer size.
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JHG
RE: Large diameter washers and hole+bolt sizes ?
RE: Large diameter washers and hole+bolt sizes ?
RE: Large diameter washers and hole+bolt sizes ?
Take a look at the Belleville washers in the McMaster Carr catalogue. They have some serious, heavy duty ones, unfortunately, without technical specifications. I worked out their stresses and compression forces, and I found that they approximated the yield strength of the screws. This did not suit my purposes at the time, but I made a note of it. This could be useful sometime.
You will have to look them up and do the analysis, and you may have to use a torque wrench to assemble everything. This may solve your problem.
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JHG
RE: Large diameter washers and hole+bolt sizes ?
If you need something stronger, it will have to be custom.
It does not have to be expensive; it's possible to bang out a rectangular plate with a hole in it, in just a few seconds with an ironworker, provided that you don't use stupid tolerances.
Mike Halloran
Pembroke Pines, FL, USA
RE: Large diameter washers and hole+bolt sizes ?
What is needed is a plate of the same thickness as the base plate the hole is in welded to the plate then droll a smaller hole.
Trying to fudge it with a washer is just asking for trouble IMHO. If you search for washer on this forum you find some interesting debates and lots of people mention asme PCC
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Large diameter washers and hole+bolt sizes ?
RE: Large diameter washers and hole+bolt sizes ?
I would just make a combination of bush and washer if you can't use bigger bolt.
RE: Large diameter washers and hole+bolt sizes ?
- Company apparently has only M8 size screws ?
RE: Large diameter washers and hole+bolt sizes ?
RE: Large diameter washers and hole+bolt sizes ?
The extra depth of the lower T shape provides a lot more strength than a simple flat washer of variable strength.
There is no way you can accept having a flat plate / washer start to bend - you're then already at max force and any more force will get worse and worse as the bending continues.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Large diameter washers and hole+bolt sizes ?
are you saying you need the full 14 mm DIA holes to assemble the components ?
RE: Large diameter washers and hole+bolt sizes ?
RE: Large diameter washers and hole+bolt sizes ?
It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.