Clark CRM-12/CTM-12 Rockwell Type Hardness Tester

Clark CRM-12/CTM-12 Rockwell Type Hardness Tester

Clark CRM-12 / CTM-12 Rockwell Type Hardness Testers


These new dial “Rockwell type” motorized hardness testers have all the great features of our previous models but at a new lower price. These units are equipped with a built-in dial indicator that is both accurate and easy to read. They are ideal for the lab yet built tough enough to stand up to any plant conditions.


  • Easy to read, accurate dial indicator
  • Performs 15 (CRM-12) or 30 (CTM-12) different Rockwell-type scales
  • Motorized system with automatic loading and removal of major loads
  • One piece, heavy-duty cast housing
  • Built-in dial-a-weight system
  • Certified and ready to use


Item CRM-12 (Standard) CTM-12 (Standard & Superficial)
Minor Load: 10 kgf (98.07N) 10 kgf (98.07N) & 3Kg (29.42N)
Test Load:
  • 60 kgf (588.4N)
  • 100 kgf (980.7N)
  • 150 kgf (471N)
  • 15 kgf (147.1N)
  • 30 kgf (294.2N)
  • 45 kgf (441.3N)
  • 60 kgf (588.4N)
  • 100 kgf (980.7N)
  • 150 kgf (471N)
Load Control: Automatic (Application-hold-release)
Dwell Time: Selectable 1 - 99 seconds
Scales: A, B, C, D, E, F, G, H, K, L, M, P, R, S, V A, B, C, D, E, F, G, H, K, L, M, P, R, S, V, 15N, 30N, 45N, 15T, 30T, 45T, 15W, 30W, 45W, 15X, 30X, 45X, 15Y, 30Y, 45Y
Max. Specimen Height: 12" (305mm) 11" (280mm)
Max. Specimen Depth: 6" (155mm)
Dimensions: 8.5" x 18" x 30.5" (216 x 457 x 775mm), Approx. 200 lbs. (90 kgf)
Power Supply: Single Phase 120 VAC

Standard Accessories Include:

CRM-12 (Standard) CTM-12 (Standard & Superficial)
Hardness Standard: HRC, HRBW HRC, HRBW, HR30N, HR30TW
Diamond Indenter: C C, N
Carbide Ball Indenter: 1/16"
Flat Anvil: 2.5" (60mm) Flat, 1.5" (40mm) V-Anvil
Leveling Legs, Machine Cover, Accessory Box, Conversion Chart, Power Cord, User Manual.

Product Literature

Description Part # Saved Price Select Option Add to
CRM-12 Rockwell Type Hardness Tester HT-CR-CRM-12 Request Pricing
CTM-12 Rockwell Type Hardness Tester HT-CR-CTM-12 Request Pricing