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It's has had a lot of use. I've traveled with this bike quite a lot and things like crashing with saddle bags on probably cause some pretty wonky forces. I didn't actually check but it's entirely possible my failing eyesight and lack of coffee actually put the line over 5Nm.
I found a spare clamp I can use until the replacement turns up. Another option might be that I've not seated it properly when swapping the post and it got tightened on an angle - doesn't look that way though.
Oh, during Brimstone I was bashing the bike onto a wooden post in an attempt to get the Di2 battery out. That's probably not in most seat clamps normal life cycle! :D
No idea what the industrial standard is, but I’m surprised 1Nm above stated torque limit caused a seat post clamp to fail. It’s one of the parts that gets hamfisted the most on a bike.