The standard conditions for measuring with a hexagonal plug gauge are a temperature of 20 ℃ and a measuring force of zero.

The hexagonal plug gauge used to inspect the large solid dimensions of workpieces (i.e. small holes and large shafts) is called a through gauge.

The gauge used to check the small solid size of the workpiece (i.e. the hole is large and the shaft is small) with a hexagonal plug gauge is called a stop gauge.

The gauges that comply with the size judgment principle (i.e. Taylor's principle) are as follows:

The measuring surface of the gauge should be a complete surface corresponding to the shape of the hole or shaft (usually referred to as a full gauge), with dimensions equal to the large solid dimensions of the workpiece and a length equal to the fitting length.

The measuring surface of the gauge should be point like, and the size between the two measuring surfaces should be equal to the small solid size of the workpiece.

When it is inconvenient or difficult to apply a gauge that complies with the Taylor principle in certain situations, a gauge that deviates from the Taylor principle can be used while ensuring that the shape error of the inspected workpiece does not affect the fitting properties.

Use a gauge that meets this standard to inspect the workpiece. If the pass gauge can pass but the stop gauge cannot pass, the workpiece should be considered a qualified product.

When the manufacturer inspects the workpiece, the operator should use a new or less worn gauge; The inspection department should use the same form of gauge as the operator, which has been worn out a lot.

Hexagonal plug gauges are used to measure the size, distance, and depth of holes, and can be used as standardized inspection tools for holes. They are widely used in various high-precision and cutting-edge technologies such as electronic boards, circuit boards, molds, and mechanical manufacturing.