There's been a lot of threads lately on Spuhrs with issues, I believe all the previous ones had to do with the ring cap itself cracking on the top. This is the first one with the mount itself cracking. Bit of a worrying development, and I wonder if it's an issue with a bad lot of steel.Yours is the 3rd or 4th thread in as many weeks referencing cracks in Spuhr mounts. So I would say yes, it happens.
If anything putting oil on the screws would make it more likely to crack if using the same torque value. It would increase clamping force for a given torque.I saw 4 of them break exactly like that last year at various matches.
None of them were noted hard impacts on the scope or mount itself, and all claimed they were torqued properly... Not sure if it was a bad batch of metal or what.
I have started putting a dab of oil on the screws when torquing mine as of late but not sure if that makes any difference.
This. I learned this the hard way working on diesel engines/turbos. To get the same tension on a bolt you need less torque w lubed threads than without. I assume this will vary with the type of lube. Typical reduction seems to be 25-30% for lubed threads vs dry. See here:If anything putting oil on the screws would make it more likely to crack if using the same torque value. It would increase clamping force for a given torque.