I can tell you that on the 747-400 center wing tank in 1999 we used countersunk WQ Radius Lead-in Bolts to fasten the spars (Front, Mid and Rear) and spanwise beams (1 2 and 3) to the upper and lower surface to create the center wing section. From the rear the layout is: Rear spar, spanwise beam (SWB) #1, mid spar, SWB #2, SWB#3, Front spar. We drilled .311" holes with .013" countersinks and cold worked them before taking the pieces apart with a crane in order to de-burr the holes and apply sealant before putting it back together, then installing fasteners and securing them with washers and nuts using nut drivers from the tool room which were calibrated to the correct torque. I remember using pan head WR fasteners on the back side of the rear spar when filling holes that had been used for attachments that the crane had used to turn the CWT over to move it to another jig in our area. Wow... I might even remember the number... 8-23 maybe?! In 1999 Boeing quit building the CWT from Bombardier parts and started importing it complete from Japan (probably made by whoever was making the 777 CWT). I almost never used lockbolts (maybe only on that 10-23 on the rear spar?), but all the mechanics called them "Swedge fasteners". This video just taught me that they are actually "Swage fasteners"! Oops! :)
