MU-642HW Mounting Hardward for Plastic Boxes
Price: $1.90

Hardware to mount circuit board inside the plastic box.
Four of each:
(1) Recessed Bumper with mounting hole
(2) 1/4" by 1/2" Nylon Spacer
(3) #4-40 Phillip Head Pan 1" Bolt
(5) #4-40 Nut
(6) #4 Flat Washer