Feeler gauge

The feeler gauge ( subjects spy ) is a measurement gauge, since it embodies a defined dimension, and is used for testing a gap dimension, ie the width of a gap. It consists of a set of precisely calibrated, rarely hardened metal strips of different thickness. The individual metal strips are assembled in a fan in a compact measurement tool, in which the plate thickness required in each case can swing out. Each metal strip includes printing with thickness. A typical feeler gauge has a test range of 0.05 mm to 1.00 mm. To check, put out the strongest possible teaching into the gap and can thus determine the gap width by reading the sheet thickness.

It is used for example for setting electrical contact switches or to customize Shears on the strength of the material to be cut. In the measurement technique is tested with her, if that lies flat with a coordinate measuring object to be measured on the measuring table. In automotive engineering will, among other things required to measure the valve clearance or adjust the contact breaker gap.

In DIN 2275 dimensions, hardness, and the label of feeler gauges are standardized.

Besides feeler gauge sets, a feeler gauge strips in 5 -meter cans are made ​​.

Colloquially, the feeler gauge is referred to as a "spy " or " valve theory ". If a gap or an inside dimension with a feeler gauge or gauge blocks measured, this is referred to as " block out ".