ACM Laboratory offers a NATA accredited service for the calibration of the highest accuracy grades of gauge blocks by comparison and laser interferometer methods. The gauge blocks are measured in environmentally (temperature) controlled (20 ± 0.5 ˚C) laboratory using special equipment designed and built by ACM Laboratory metrologist.


Specification Standards

  • AS 1457
  • BS 4311

Gauge Block Grades

  • Grade 0
  • Grade 1 (Inspection)
  • Grade 2 (Workshop)

Gauge Block Types and Calibration Features

  • Rectangular gauge block sets with blocks from 0.5 to 100mm (4 inch) are examined central length, variation in length and flatness.
  • Gauge blocks (rectangular or square) > 100mm/4 inch are not calibrated to a particular standard. Central length, parallelism and flatness are measured on each block.
  • For gauge block sets ≤0.5mm (0.02 inch) or individual blocks <0.5mm (0.02 inch), these would be examined for the central length only.
  • Gauge blocks ≤0.5mm that are not of the general cross section dimensions (9 x 30 or 9 x 35mm).
  • Square (Hoke) Style Gauge Block Sets
  • Gauge block accessories, including:

Straight Edges
Scribe Point
Centre Point
Base BlockT
Inside/Outside Jaws: Type A and B
Trammel Points
Holders for cleaning, condition & function

  • Gauge Blocks Materials:

Chromium carbide

Further Information

Please contact with us to discuss your requirements and book in your order. To enable us to provide you the accurate quotation, please provide the following information: manufactory, material, grade, block shape and number of gauge blocks.


We also sell gauge blocks manufactured by Mitutoyo (Japan).