Making sense of 6g 6h thread gauges in the shop
If you're working with metric fasteners, you've probably run into 6g 6h thread gauges while checking for a proper fit. It's one of those things that seems straightforward enough on paper, but once you're out on the shop floor trying to figure out why a bolt isn't catching or why a tapped hole feels "sloppy," those little letters and numbers start to matter a lot more. ...