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Good point; I recognize there are a lot of custom fasteners (particularly
frame hardware) but in the case of stem bolts particularly (tightened to ~5nm-
7nm generally) if it isn't marked I generally replace to be sure.
Occasionally (but rarely) the spec is listed on the stem makers website but
not stamped on the hardware.
Another exception would be Ti hardware where the manufacturer lists the grade
(RaceBolts for example) but it isn't on the bolts.
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