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Hardness Tester

HT-7: Portable Hardness Tester

HT-7 is a hardness tester which uses an impact body with a tungsten carbide tip, which is impelled by a spring onto the metal surface. The ratio of rebound velocity to the impact velocity is proportional to the hardness of the sample. The instrument converts this into a hardness value in various scales.

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Technical Details
HT-7
Application Areas In situ hardness measurement of:
  • Dies and moulds
  • Large and heavy work pieces
  • Shafts
  • Bearings
  • Lab measurements on special forms
  • Identification of materials by measuring strength of material
Range See Table 1
Strength of material See Table 2
Impact Device Tungsten Carbide ball
Measuring Area (Aperture)
Accuracy
Operating Temperature 10° C to 50° C
Battery 4 penlite cells (50-60 hours)
Dimensions
H x W x D (in mm)
150 H x 80 W x 45 D
Weight (with battery) 365 grams
Range & Material Table 1
HRC HRB HB HV HSD
Steel 18-68.5 60-99.5 93-651 83-976 32-99.5
C.W. Tool Steel 20-67 80-898
Cast Aluminium 30-159
Grey Cast Iron 93-334
Nodular Cast Iron 131-387
W.P Iron HL ONLY
Brass 14-95 40-173
Bronze 60-290
Copper 45-315
Strength of Material Table 2
Code. No. Sample Material LD Ob(Mpa)
1 Carbon Steel 350 – 710 374 – 1670
2 Cr – Steel 500 – 730 707 – 1829
3 CrV – Steel 500 – 750 704 – 1980
4 CrNi – Steel 500 – 749 763 – 1999
5 CrMo – Steel 500 – 730 721 – 1813
6 CrNiMo – Steel 540 – 730 844 – 1869
7 CrMnSi – Steel 500 – 750 755 – 1993
8 Super Strength Steel 630 – 740 1180 – 1936
9 Stainless Steel 500 – 710 730 – 1676
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