The Rockwelll hardness test method was developed right here in Hartford, Connecticut, by Stanley P. Rockwell around 1920.  While the testers of today look and function very differently from their counterparts, the test method is still the same.  Using a penetrator and a known weight load combination, which comprises a scale, the hardness of materials is determined by the depth of penetration.

 

Testers come in three different variations:

 

  • Standard - Applies loads of 150 kg, 100 kg, and 60 kg.  Typically used to check HRC, HRA and HRBw

  • Superficial - Applies loads of 15 kg, 30 kg, and 45 kg.  Most common scales include HR15N, HR30N and HR15Tw

  • Twin - As the name implies, these testers are capable of checking all 30 Rockwell Scales

 

Model:

Manufacturer:

Type:

Vertical Capacity:

Throat Depth:

Weight:

True Blue II

United

Closed Loop Load Cell Twin Tester

5.5 inches stock, 9.5 available on request

Available in 10, 14, 18, 20 and 36 inch capacities

From 185 lbs to 210 lbs, depending on model

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Throat Depth:

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Veristron

Newage Hardness Testing

Standard or Superficial High Speed Production Tester

7.8 inches (N Base) or 8.8 inches (T Base)

8.2 inches (N Base), or 16 to 36 inches (T Base)

From 185 lbs to 210 lbs, depending on model

Model:

Manufacturer:

Type:

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Throat Depth:

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Indentron

Newage Hardness Testing

Standard, Superficial or Twin configurations

5.875 inches

10 or 15 inches

220 lbs

Model:

Manufacturer:

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Throat Depth:

Weight:

CLC 200R

Clark

Load Cell Twin Tester

6.7 inches

10 inches

220 lbs

Model:

Manufacturer:

Type:

Vertical Capacity:

Throat Depth:

Weight:

CR Series

Clark

6 inches

7.5 or 11.5 inches

160 lbs

Standard, Superficial or Twin configurations

Model:

CR-1eA Series

Manufacturer:

Clark

Type:

Standard

Vertical Capacity:

7.5 or 11.5 inches

Throat Depth:

6 inches

Weight:

165 lbs

Model:

Manufacturer:

Type:

Vertical Capacity:

Throat Depth:

Weight:

CR-8 Series

Clark

6 inches

8 inches

135 lbs

Standard or Superficial

Model:

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Type:

Vertical Capacity:

Throat Depth:

Weight:

HR150A

HR150A

5 inches

7.5 inches

120 lbs

Standard

United Service Company Inc   43 Cody Street   West Hartford   CT   06110

T: 860.667.4403   F: 860.665.1142   info@unitedservicecompanyinc.com