Designed for use in calibrating all portable, bench and production Brinell Hardness Testers. Contains five master Brinell impressions. Made from de-carb free tool steel. Meets ASTM E-10 specifications. Aluminum test blocks available for lower hardness ranges


  • Can be used for Brinell Calibrations HB 200 through HB 500
  • Each test block contains 5 master Brinell impressions, certified in accordance to ASTM E-10 on equipment calibrated and traceable to NIST.
  • The arithmetic mean of these 5 impressions is inscribed on the block both in BHN Hardness and diameter in millimeters.
  • To insure uniformity of testing, the master impressions are made by a Brinell tester with oil dampened dead-weight electronically controlled cycle.
  • Calibrations of master impressions are made with state-of-the-art calibration equipment.
  • The special grain free polished surface is designed for easy, error-free reading.


  • KING REFERENCE Test Block meets ASTM E-10.
  • All test measurement equipment is calibrated and traceable to NIST.
  • Test block dimensions (12″ square test surface): Length 6″ (15.24 cm), Width 2″ (5.08 cm), Thickness 5/8″ (1.59 cm)
  • Material: De-Carb free tool steel.
  • Brinell Calibrations: HB 200 – HB 500 (3000 kg).

Blocks are available in varying hardnesses between 200-500 in approximate increments of 20HB