Hardness Value of Industrial Hard Chrome Plating

Hardness Values

Industrial hard chrome can be deposited in a rather broad range of hardness depending upon plating bath parameters. Average hardness is in the range of 66 to 70 Rockwell C scale.

A deposit of over 0.001-inch thick is essential before chromium will assume its true hardness characteristics when used over unhardened basis metals. Over a hardened base, however, the thickness is not necessary because of the substantial backing provided.

Comparison of Hardness Values 
Material Moh’s Value Knoop Value Rockwell C Scale
Cadmium 2.0 37 -
Zinc 2.5 119 -
Copper 3.0 163 -
Nickel 3.8 225 20
Iron 4.2 270 26
Induction Hardened Steel Chrome 6.8 775 62
Chrome 9.0 946 69
Diamond 10.0 7,000 -


4 Chrome Plating Processes by Electro-Coatings

Click to view our Chrome Comparison table and
learn more about our 
4 Chrome Plating Processes.

Properties and Benefits of Industrial Hard Chrome Plating

  • Wear & abrasion resistance
  • Lubricity
  • Hard­ness
  • Durability
  • Adhesion & bonding
  • Low coefficient of friction in metal parts
  • Prevents seizing & galling 
  • Restores the dimensions of undersized parts
  • Extends equipment in-service life, reducing costly downtime

The data and Information presented are based on our experience to date. The material is intended as a guide for use at your discretion. ACME Holdings or its operating divisions assume no liability in connection with this material.