A range of LEEB type impact devices that can be quickly interchanged to offer an expanded range of testing capabilities for the LHT-160 and LHT-200 series portable hardness tester.  

Considerations for optional impact devices may include non-standard hardness, thickness of the sample.  Accessibility to the test area and surface roughness may also be factors of interest when selecting optional impact devices.

The standard supply is a D-Type Impact device which is suitable for most general metal hardness testing.

Below are a list of the different type of impact devices and their application:

D Type -  This is the standard supply and is used in 90% of applications.  It is a good general use device and works on material that is greater than 5mm of thickness, up to approx. 68.5 HRC.

C Type - For small and light weight samples from above 1mm of thickness (depending on the material).  They are also better for testing materials with surface hardened layers as the C-type applies a lower impact force when testing.

DC Type - Designed for applications where there is reduced height accessibility.  It is much shorter than the standard unit at about 85mm total length; but with all the functionality of the standard D-type impact device. 

DL Type - Long nose type is designed to gain access in areas that other gauges cannot.  Places like ring grooves, gear teeth, long channels, holes and recesses are some of the areas that this unit is perfect for.

G Type - This unit is designed for rough, heavy objects such as raw castings.  It has a heavy duty device that allows for Brinell testing an uneven, unpolished surface often found at foundries. Use for cast steel and iron.

E Type - New type impact device which uses a synthetic diamond tip for super hard material up to 70.7 HRC.

If you are uncertain on with device would suit your application best, please contact us to discuss.


Impact Device D/DC/DL G C E
Impacting Energy 11mJ 90mJ 2.7mJ 11mJ
Mass of Impact body 5.5/5.5/7.2gm 20gm 3.0gm 5.5gm
Diameter 20/20/6mm 30mm 20mm 20mm
Length 147/86/202mm 255mm 141mm 155mm
Weight 75/50/60gm 250gm 75gm 80gm
Max. Hardness of workpiece 940/940/950HV 650HV 1000HV 1200HV
Surface Roughness of workpiece ≤1.6µm ≤6.3µm ≤0.4µm ≤1.6µm
Min weight of workpiece (direct) >5Kg >15Kg >1.5Kg >5Kg
Min weight of workpiece (support) 2~5Kg 5~15Kg 0.5~1.5Kg 2~5Kg
Min weight of workpiece (coupled) 0.05~2Kg 0.5~5Kg 0.02~0.5Kg 0.05~2Kg
Min thickness of workpiece (coupled) 5mm 10mm 1mm 5mm
Min thickness of hardened layer 0.8mm 1.2mm 0.2mm 0.8mm
Hardness of spherical test tip 1600HV 5000HV
Material of spherical test tip Tungsten Carbide Diamond


SKU LHT-ImpactDevices

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