Structural Joint Bolt, Nut, Washer Order

[jheydon2]

Hello All,

I was wondering if there is any AISC Standard which discusses how structural joint fasteners should be assembled? ie Bolt - Joint - Washer - Nut or Bolt - Washer - Joint - Nut.

Any help would be appreciated.

Thanks,
Justin

 

[Once20036]

I believe this is covered by the RCSC, and the washer is placed under the turned element.
RCSC is published at the end of the AISC specification, and is available free online in a searchable PDF format.

 

[dauwerda]

Agree with Once20036. It can be downloaded here:

https://www.aisc.org/publications/steel-standards/rcsc/

 

[jheydon2]

Thank you much.

Additionally, is there any specification which states when to use washers on both the bolt and the nut?

 

[dauwerda]

Same spec (RCSC). It will have to do with the yield strength of the material in the joint and whether or not it is snug tight, pretensioned, uses oversized holes, etc. For example, I believe a pretensioned joint using A36 steel would require washers (but A572 Gr 50 would not). Take a look at section 6 of the document.

 

[dvd]

attached is excerpt from 2014 RCSC regarding washers and relation to turned element (head of bolt vs nut) also slots, oversized holes, etc. 2014 has been superseded, not sure if there were revisions to this section...

Another point on washers is that quantity of washers under bolt head / nut will need to be determined for threads excluded from shear plane .