Want to put flat casters on the bottom of my metal 2 draw file cabinet.
Could use flat head machine screws with nuts but they mustn't be too long
To protrude too far into the bottom of the cabinet
See pictures. Any ideas ?

Flat head sheet metal, maybe #12 should work but nutted machine is safest. Why not put the bolt down and the nut on the bottom?

Very good advice

When using machine screw and nut be sure to use a lock washer to prevent it form getting loose.

Chuck

Very good

Hello, In my experience in this situation I would use nuts & bolts, preferably nylock nuts so that they never work loose. I hope this is helpful to you. Chow kellyseye

Thanks a million

You are welcome. Chow kellyseye