Is aluminum a worry - we like the wedges under the flange. We would look at counter boring so top was flush.
Quote:
Wedges under the flange hold installed nuts tight, so they won't move when you apply torque to a screw. Install them in a drilled hole with an air-powered tool (required, see 92894A700 and 94675A111). Made from aluminum. Thread class is 2B.
Thread 1/4"-20
Drill Size 25/64"
Material Thickness 0.165"-0.260"
Body
Diameter 0.390"
Length 0.680"
Flange
Diameter 0.500"
Thickness 0.030"
Maximum Installed Length 0.380"
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McMaster-Carr