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Is there a CODE limit on how many washers can be stacked on a bolt ?
3

Is there a CODE limit on how many washers can be stacked on a bolt ?

Is there a CODE limit on how many washers can be stacked on a bolt ?

(OP)
Hi,

I need to fill a gap, I tought using several washers. But I was wondering if there is a code issue, a limit on how many can be stacked up ?

gasma1975

RE: Is there a CODE limit on how many washers can be stacked on a bolt ?

2
For A325 and A490 fasteners that are NOT used in long-slotted holes there is no limit on the number of washers. This subject is addressed in the September 2011, issue of Modern Steel Construction. See this link:
http://www.modernsteel.com/Uploads/Issues/Septembe...

For long-slotted holes there are restrictions, see this link for a reference to the appropriate table in the AISC specification:
http://www.portlandbolt.com/faqs/washers-required-...

www.SlideRuleEra.net idea
www.VacuumTubeEra.net r2d2

RE: Is there a CODE limit on how many washers can be stacked on a bolt ?

Nice response, Slide Rule. I recalled this question being in a publication somewhere, but bam, you found it!

RE: Is there a CODE limit on how many washers can be stacked on a bolt ?

Absolute and conclusive proof that us old guys are not all washered washed up...

Mike McCann
MMC Engineering

RE: Is there a CODE limit on how many washers can be stacked on a bolt ?

What kind of gap are you trying to fill exactly? Is the bolt subjected to bending across the gap? That Msc article is for putting washers under a bolt head or nut where there is no stress in the bolt. Do you have that case? Check Aisc chapter j if not.

RE: Is there a CODE limit on how many washers can be stacked on a bolt ?

If the gap is within the shear plane, See section 5.1 of AISC Specification for Structural Joints using A325 or A490 bolts. It provides requirements for reducing the bolt capacity based on filler thickness.

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