Penna Flame Offers a Variety of Free Resources
To Help You With Your Business!

Mobile App

Get the convenience of having Penna Flame Industries on your Apple or Android device (phone or tablet). By having Penna Flame Industries at arms length, you get the confidence of getting answers instantly.

This application provides a Hardness Conversion Chart, a Hardness Case Depth Chart, a Metric to English Converter, and a Decimal to Fraction Converter.

Penna Flame Industries is built on both quality and customer loyalty. This readily available mobile app helps you and your organization to achieve both of these key competencies and best of all, its FREE!

Key Features:    • Hardness Conversion Chart
                            • Hardness Case Depth Chart
                            • Metric to English Converter
                            • Decimal to Fraction Converter

Click on the appropriate link below to get Penna Flame's Mobile App.

Click on the image above to download your PDF copy of this extremely useful chart.

Hardness Conversion Chart

Brinell Hardness Test:

This is the oldest hardness test method frequently used today to determine the hardness of iron and steel castings and forgings that have a grain structure too coarse for Rockwell or Vickers testing. The test was invented in Sweden in 1900 by Dr. J. A. Brinell and follows ASTM E10 / ISO 6506 standards.

Rockwell Hardness Test:

Invented by Stanley P. Rockwell, this test allows the user to perform accurate hardness tests on a variety of different sized parts in just a few seconds. The Rockwell test follows ASTM E18 Metals, ISO 6508 Metals, and ASTM D785 Plastics standards.

Vickers Hardness Test:

Originally called the Diamond Pyramid Hardness test, the Vickers test was invented in 1925 in England. This test covers all testing requirements with its two distinct force ranges of micro and macro. Vickers values are generally test force independent. Vickers follows ASTM E384, ASTM E92, and ISO 6507 standards.

Hardness and Case Depth Chart

This chart is a general guide. Hardness and case depth's may vary depending on the flame hardening technique used and actual chemistry of the material.

*For modified grades of 52100 and work roll materials, please contact us at 1.800.245.5084 or 724.452.8750.


Penna Flame Industries, Inc.
1856 State Route 588 (Lordi Circle)
Zelienople, PA 16063

Toll-Free: 1.800.245.5084
Local:  724.452.8750
Fax:  724.452.0484

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