The DLC coating has the following advantages: High hardness, extremely wear resistance. Low friction coefficient. Corrosion resistance
Plug gauges: GO is coated, NO-GO is not. Ring gauges: GO is coated, NO-GO is not
The following thread ring gauges and plug gauges are available with DLC coating. Metric fine thread ring gauges and plug gauges(4632, 4642 series). Metric thread ring gauges and plug gauges(4631, 4641 series). American standard thread ring gauges and plug gauges(4633, 4643 series). Whitworth pipe thread ring gauge and plug gages(4635, 4645 series). PG thread gauges(4637 series)