The square nuts are cheap and provide a strong mounting point. They require you to install the tensioner clip before being slid into the slot. These are suitable for M8 screws.
|Manufacturer Part Number||2.12.10.M8|
|T-Slot Profile Size||PG40|
This nut slides into the groove of a PG40 T-slot profile to create a mounting place for metal or plastic plating, or any other object with mounting holes. Here's a list of compatible profiles: