Flush-mounting rivnuts

[Oblarg]

Is there a "proper" way to flush-mount a rivet nut? So far I've just been lightly countersinking the hole with a larger drill-bit before setting the rivnut, which seems to work OK, but it seems a bit crude and I was wondering if there's a better way to do it.

[Teched3]

You could counterbore with an end mill. There is a style rivet nut that is knurled to "lock" it into the mounting hole, which make them a lot less prone to spin, making it difficult to remove. :)

[BenDSterling]

Normally, you wouldn't flush mount a rivet, they are designed to stick out.
But, the proper way to flush mount a rivet would be to drill a hole about 1/16" larger than the head of the rivet so that the head of the rivet would sit down in the hole. Make sure that the material you are riveting is thick enough so that this does not affect the strength of the material or the joint.
Also make sure you are using the correct type of rivet. Use flat-head rivets or countersunk rivets instead of normal rivets.

[tim-tim]

Get the right type of rivet nut, Countersunk Rivet Nuts (http://www.rivetnuts.com/countersunk-rivet-nuts.htm). Then apply countersink as you would for any other countersunk fastener.

[Oblarg]

Get the right type of rivet nut, Countersunk Rivet Nuts (http://www.rivetnuts.com/countersunk-rivet-nuts.htm). Then apply countersink as you would for any other countersunk fastener.

I did get these (well, to be specific, these (http://shop.stafast.com/threaded-inserts/inserts-for-plastic/knock-in/riv-nuts-with-countersunk-head-and-serrations), but the ones you linked look very similar), though as far as I can tell they're not really "countersunk" in any appreciable way, they just have very small heads.

[Zstack836]

Depending on the brand, the countersunk will look slightly different.

http://www.fastenright.com/Portals/0/general-product-graphics/images/technical-images/Rivet-Nut-Countersunk-Knurled-Closed-End.jpg

[Oblarg]

Depending on the brand, the countersunk will look slightly different.

http://www.fastenright.com/Portals/0/general-product-graphics/images/technical-images/Rivet-Nut-Countersunk-Knurled-Closed-End.jpg

The only ones I can find that appear to actually have what I'd call a "countersunk head" (i.e. a 90-degree conical shape) are metric thread. The ones advertised as "countersunk head" in standard appear to be identical to the "k-series" rivet nuts.

[Zstack836]

I know they exist since we have used them in the past, as for where we got them from.. that I am not sure about.

An internet search provided this document:

http://www.rivnut.com/pdf/rivnut/rivnut-countersunk-head-round-body.pdf

Looks like you can get them anywhere from 6-32 all the way up to 1/2-13. Would have to request a quote if going through this manufacturer. I looked around to try and see if there was anywhere else that could provide these but I found what you did, only metric. This is the only site that I saw provided standard hardware.

[Oblarg]

I know they exist since we have used them in the past, as for where we got them from.. that I am not sure about.

An internet search provided this document:

http://www.rivnut.com/pdf/rivnut/rivnut-countersunk-head-round-body.pdf

Looks like you can get them anywhere from 6-32 all the way up to 1/2-13. Would have to request a quote if going through this manufacturer. I looked around to try and see if there was anywhere else that could provide these but I found what you did, only metric. This is the only site that I saw provided standard hardware.

Thanks a lot for the link, I'll call them up tomorrow.