DIAMETER : 1.25INBORE : 0.375INWIDTH : 0.75INOVERALL WIDTH : 0.8125IN APPLICABLE MACHINERY : MODEL 10-48, MODEL 10-72, MODEL 10-84, A-2, AVB, 50-88, 60-88, DPW 50-88, HT 51-88, HT 60-88, LVR-1, LVR-2, LVR-3, LVR-4, LVR-6, LVR-7, LVR-8, SHR 60-20, SHR 60-20P, SHR 60-30, VP 50-88, CL-1, CL-2, Cl-3, CL-4, EL-1, EL-2, EL-3, EL-4, GL-1, GL-2, GL-3, GL-4, HL-1, HL-2, HL-3, HL-4EDGE-SWEETS PN : 734110040

Press fit Nutsfor sheet metal

I do not know the name of what I am looking for. The bolt is M12x1.5 if that matters. Any advice / places I could buy such a thing?

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I'm building an adapter plate to mount an engine to a transmission it was never designed to mate to. To do this I'm using a 1/2" thick piece of aluminum. There are a few bolts that cannot extend through the aluminum plate. I'm looking for some sort of press in fitting / nut kind of like a rivet nut but a bit more aggressive on the outside. I have currently threaded the aluminium but it is not confidence inspiring when there is ~400HP held by 4 M12 bolts.