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Oblong Holes for Bolts

03/27/2013 12:58 AM

Hello brothers,

Is there any standards/specifications indicate the relationship between distance of 2 bolt groups and size of oblong holes for bolts?

Thanks!

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#1

Re: Oblong holes for bolts.

03/27/2013 2:32 AM

That's going to depend heavily on the particular component/assembly and its end-usage.

Since such "oblong" bolt holes are generally used to create a "universal" replacement part, the design engineer will likely be responsible for calculating the necessary specifications on a case by case basis.

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#2

Re: Oblong holes for bolts.

03/27/2013 6:06 AM

It depends on the tolerances for distances and position. It is recommendable to use as well for the nuts as for the bolt head thick washers (or more washers as a stack) in order to compensate the contact area reduction.

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#3

Re: Oblong Holes for Bolts

03/27/2013 9:55 AM

Here is the Specification for structural joints using A325 or A490 bolts. These may not be what you want but they do describe slotted holes for structural high strength bolts.

http://www.boltcouncil.org/files/2004RCSCSpecification.pdf

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#4

Re: Oblong Holes for Bolts

03/27/2013 11:44 AM

You are using the term "Oblong" which is more than likely "Slotted" holes which are intended to allow for movement due to thermal expansion.

Where and on what kind of equipment are these "slotted" holes located?

Are there "Round" holed located on the other end of this same equipment?

What is the Material of this equipment?

What is the maximum operating temperature of this equipment?

What are the dimensions of the "slotted" hole?

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#5

Re: Oblong Holes for Bolts

03/28/2013 7:42 AM

If your application is related to structural steel and high strength structural bolts, then you should follow Passington's advice.

Additionally, I suggest you obtain a copy of the American Institute of Steel Construction (AISC) "Manual of Steel Construction", preferably the ASD version since it is simpler to understand, where slotted bolt holes specifications are covered quite extensively, including Allowable Load tables.

GA for Passington...

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#6
In reply to #5

Re: Oblong Holes for Bolts

03/31/2013 4:58 PM

And GA to you Capt, the AISC manual is where I go for this info.

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