Rivnut Tool

[GeeTwo]

Originally Posted by Fusion_Clint

Geetwo,

Help me understand your test. It seems that you are torquing the screw in the mounted rivnet to see when it will fail/stripout, is this the case?

Considering that the recommended torque for a typical 10X32 screw application is in the 30 In Lbs range, reaching from 48 to 80 In Lbs in most of the material is fairly impressive. http://www.federalscrewproducts.com/torque-chart.htm

Yes. As described several posts above, I was using a 1/2" nut and three washers against the stock so that I was pulling on the rivnut, not simply tightening against the flange.

I had already noticed that the stainless machine screws supported several times the rated torque, even a good bit over grade 8. What I found even more impressive was that all of the shear failures occurred at the same torque to within about 10% (my measuring precision with this tool at that torque). Further the torque on the threaded portion was probably quite a bit less than the torque I was applying, due to friction between the head of the screw and the large washers.