Thread Check Inc. supplies a complete range of Hex Plug Gages per ANSI/ASME B107.17M. Hex plug gages per ASME B107.17M are used to inspect wrench opening and spark plug wrench opening for inch and metric sizes. The size range in inches covers 1/8 to 3.0" and 2.0mm to 75mm in metric. The standard covers hex gage designs and square gage designs. Gages are manufactured from oil hardened tool steel with a minimum HRC of 60 HRC. Thread Check Inc. can also build custom hex plug gages per customer specifications.