SPECIMEN GAUGE MARKING PUNCHES

Gauge-point punches are used to punch mark a metallic specimen with a set gauge length before testing so that specimen elongation can be measured either during or after the test. Punches are available for a range of common gauge lengths in both manual and automatic styles.

Principle of Operation

Manual gauge-point punches require a strike with a hammer to punch mark the specimen. Standard punches consist of either a single set of punch points or a combination of two different sets of punch points. The punches are checked at the factory to provide punch marks at a predetermined, fixed gauge length.