FKD
FKD High Precision Locking Nut ZLD 376 01 96A Y62419A01 NEW
You will notice that Milwaukee brand drills have a compact design for tight spaces.
FKD Precision Ball Screw Lock Nut FKN 40 x 1.5 M8 R2-UC
A nice touch here is U-blox's compatibility with older industrial equipment.