Portable Leeb Hardness Tester Probes

Material Hardness

Hardness scale

Impact device

D/DC

D+15

C

G

E (imported)

DL

Steel and cast steel

HRC 

17.9～68.5

19.3～67.9

20.0～69.5

22.4～70.7

20.6～68.2

HRB 

59.6～99.6

47.7～99.9

37.0～99.9

HRA 

59.1～85.8

61.7～88.0

HB  

127～651

80～638

80～683

90～646

83～663

81～646

HV   

83～976

80～937

80～996

84～1042

80～950

HS   

32.2～99.5

33.3～99.3

31.8～102.1

35.8～102.6

30.6～96.8

Steel

HB

143～650

CWT. steel

HRC  

20.4～67.1

19.8～68.2

20.7～68.2

22.6～70.2

HV  

80～898

80～935

100～941

82～1009

Stainless steel

HRB

46.5～101.7

HB

85～655

HV

85～802

GC. iron

HRC

HB

93～334

92～326

HV

NC. iron

HRC

HB

131～387

127～364

HV

C. Alum

HB

19～164

23～210

32～168

HRB

23.8～84.6

22.7～85.0

23.8～85.5

Brass

HB

40～173

HRB

13.5～95.3

Bronze

HB

60～290

Copper

HB

45～315

No.

impact device

Hardness value of Leeb standard hardness block

Accuracy of displayed value

Repeatability of displayed value

1

D

790±40HLD 530±40HLD

±6 HLD ±10 HLD

6 HLD 10 HLD

2

DC

790±30HLDC 530±40HLDC

±6 HLDC ±10 HLDC

6 HLDC 10 HLDC

3

DL

894±40HLDL 736±40HLDL

±12 HLDL

12 HLDL

4

D+15

795±40HLD+15 544±40HLD+15

±12 HLD+15

12 HLD+15

5

G

590±40HLG 500±40HLG

±12 HLG

12 HLG

6

E

755±40HLE 508±40HLE

±12 HLE

12 HLE

7

C

851±40HLC 590±40HLC

±12 HLC

12 HLC

Types of impact device

DC(D)/DL

D+15

C

G

E(imported)

Impact energy
Mass of impact body

11mJ
5.5g/7.2g

11mJ
7.8g

2.7mJ
3.0g

90mJ
20.0g

11mJ
5.5g

Test tip hardness
Diameter of test tip
Material of test tip

1600HV
3mm
Tungsten carbide

1600HV
3mm
Tungsten carbide

1600HV
3mm
Tungsten carbide

1600HV
5mm
Tungsten carbide

5000HV
3mm
Diamond

Impact device diameter
Impact device length
Impact device weight

20mm
86(147)/ 75mm
50g

20mm
162mm
80g

20mm
141mm
75g

30mm
254mm
250g

20mm
155mm
80g

Max. hardness of sample

940HV

940HV

1000HV

650HB

1200HV

Roughness of sample surface

1.6μm

1.6μm

0.4μm

6.3μm

1.6μm

Minimum weight of sample:
Measure directly
Need support firmly
Need coupling tightly

>5kg
2~5kg
0.05~2kg

>5kg
2~5kg
0.05~2kg

>1.5kg
0.5~1.5kg
0.02~0.5kg

>15kg
5~15kg
0.5~5kg

>5kg
2~5kg
0.05~2kg

Min. thickness of sample Coupling tightly
Min. depth of layer thickness for surface

5mm
≥0.8mm

5mm
≥0.8mm

1mm
≥0.2mm

10mm
≥1.2mm

5mm
≥0.8mm

Hardness
300HV

Indentation diameter

0.54mm

0.54mm

0.38mm

1.03mm

0.54mm

Depth of indentation

24μm

24μm

12μm

53μm

24μm

Hardness
600HV

Indentation diameter

0.54mm

0.54mm

0.32mm

0.90mm

0.54mm

Depth of indentation

17μm

17μm

8μm

41μm

17μm

Hardness
800HV

Indentation diameter

0.35mm

0.35mm

0.35mm

0.35mm

Depth of indentation

10μm

10μm

7μm

10μm

D: General test.
DC : Testing hole or inner of cylinder.
DL : Test slender narrow groove or hole

D+15 : Test
groove or
reentrant
surface.

C :
Test small, light,
thin parts and
surface of hardened
layer.

G :
Test large,
thick, heavy
and rough
surface cast
steel.

E :
Test super high
hardness
Material.