Pick the right thread gauge: go/no-go for quick checks

The fastest way to verify a thread is with a go/no-go gauge, but grabbing any gauge from the drawer will give you false confidence. The gauge must match the thread's tolerance class and fit.

Read the thread callout. For metric, an M10x1.5-6H/6g tells you the internal thread is 6H and the external thread is 6g. Use a 6H plug gauge for the hole and a 6g ring gauge for the screw. If you use a 6H gauge on a 5H thread, you will accept parts that are too loose.

For quick checks, always start with the go gauge. It should screw on or in smoothly under light hand pressure. Then the no-go gauge should not go more than two turns. If the go fails or the no-go passes, the thread is out of spec. Do not force either gauge.

Keep gauges clean and calibrated. A damaged gauge gives misleading results. For low-volume work, a thread micrometer may be enough, but for production, dedicated go/no-go is the right tool.

#GaugeBlocks# #HandTools# #3DPrinters#