ARP 200-8683 M10 x 1.25 Locking Flange Nut - 10 Piece
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There is a serrated edge to them.
Selected User Reviews For ARP 200-8683 M10 x 1.25 Locking Flange Nut - 10 Piece
The description makes no reference to this fact. I just did not buy them if I knew, so I wouldn't have returned them.
The same type of flange nuts can be found at the local home depot for a few dollars.
There is no way to know if these are true ARPs. In the end, they gave up and parted ways.
Quality nuts.
There is no indication of the grade of the parts, so assume the lowest grade (softest steel). It would not be advisable to use them for assemblies with high stresses.
Identified a bolt that had been suppose to hold down a coilover that was damaged. All four needed were replaced. It holds them down, is not loose, and the coilover has not fallen out.
The pitch of the thread is incorrect, as some others have noted. I use the same bolt that I bought at the hardware store.