Rivet length call-out on drawings 12

[JohnnyEnglish]

We don't call-out rivet lengths on drawings. We specify the rivet type as far as possible and then put XX for the length e.g. MS20615-4MXX. The quantity in the BOM is "as required", and we stock a selection of lengths that are reordered at a minimum quantity reorder point. Rivet lay-out is either determined by the company riveting standard procedure or by laser cut holes in flat patterns. The requirement is for the technician to select the correct grip length for the particular assembly.

Is this fairly standard practice on drawings? Any suggestions on other methods at other companies? What do the Boeings and Airbuses of the world do? How do you get around variations in grip length due to sheet metal thickness variations?

Thanks.

JE.

 

[elively]

We choose the configuration (length) of our components when we insert them into our assemblies and make a good faith effort to pick the correct length. Most of our hardware (screws, bolts, rivets) have grip ranges referenced next to the configuration name to help in the selection.

HOWEVER, we have a simple weasle note on our drawings:

CALCULATED FASTENER LENGTHS SHOWN. ACTUAL FASTENER LENGTHS TO BE DETERMINED AT INSTALLATION.

That note could be appended with a process spec for fastener installation if you have one.

Hope this helps.