Inspection Grade 1

Manufactured to ISO3650 (DIN861) from high quality alloy steel

Each block is heat treated for high wear resistance

Surface hardness >63HRC

Flat mirror surface finish for high dimensional stability and excellent wringing qualities.

Suitable for calibrating micrometers & calipers
The individual Gauge Block sizes in the set have been selected to check the accuracy of the micrometer spindle and measuring faces at 5 different rotational positions between 0–25mm ensuring accuracy of the screw and parallelism of the contact faces BS870
Supplied complete in fitted wooden box.

Supplied with a UKAS Calibration Certificate