Now, if we look at an M8 Large Flange Aluminium Rivnuts, you will notice the measurement is now 10.83mm which will require a 11mm Drill Bit. Available at Fastenright in Zinc Plated Steel, A2 Stainless Steel and A4 Stainless Steel as standard.

Rivet Nut Countersunk Knurled Closed End are available in diameters from M3 to M12 to suit various grip ranges. Installing these rivet nuts is simple, using a special tool with a threaded stud, or nose, that engages with the internal threads of the rivet nut and pulls upwards, deforming the unthreaded section of the rivet nut to expand under the reverse side of the material – providing a high strength permanent thread in a thin sheet material.Other variants include Flat Rivet Nuts and for a reduced-head variant of this component, take a look at Accu's Knurled Reduced Head Countersunk Rivet Nut. Stainless Steel RivNuts

Now that you've got your Rivnuts, it's important to ensure the correct sized hole is drilled to ensure a proper fit for the Rivnut to be installed.Below is an M8 Large Flange Steel Rivnut, when measured correctly it shows 13.44mm meaning we would use a 13.5mm Drill Bit. The first thing to note, all suppliers manufacture rivnuts to different specs and the hole size will vary. Rivnuts are an amazing product that can provide threads in materials too thin for tapping, or in blind holes with no access. WA Fasteners supply them in avariety of sizes and materialsto suit most applications.