Wilson-Hardness > Products > Portable Testers > Portable Digital Hardness Testers

Materials versus range for impact device D (HLD 200-900)


Material	HRC	HRB	HRA	HB	HV	HS
Steel & cast steel	20-68	60-100	59-86	80-650	80-940	32-100
Coldwork tool steel	20-68				80-940
Stainless steel	20-62	46-100		80-650	80-800
Grey cast iron				90-380
Nodular cast iron				90-380
Aluminium alloy				20-160
Brass				40-170
Bronze				60-290
Copper				45-315

The ranges are stipulated by the application limits of the relevant static procedure

Technical Specifications


Hardness Scales	HL(X), HRC, HRB, HV, HB, HS
Tensile strength UTS range (steel only)	From 370 to 2000 (10⁶ N/mm²)
Display dimensions	128 x 64 LCD with back light function
Display functions	Hardness scale, Hardness value, Limits, Times,Average, Impact direction, Type device, Memory
Accuracy	Within ± 0.5% (at HRD = 800) on solid parts
Statistics	Average value
Memory	500 average readings, date
Output	RS232
Impact device	Any type
Workpiece max. hardness value	940HV
Work piece radius (convex/concave)	Rmin = 50 mm (with support ring Rmin = 10 mm)
Work piece minimum weight	1.5 kg on solid support (0.1 kg with couplant paste)
Work piece min. thickness when coupled	3 mm
Work piece min. case hardened depth	0.8 mm
Power	2 x AA battery 1.5V (low bat. warning)
Operating temperature	5 to 50º C
Overall dimensions (H x W x D)	132 mm x 76 mm x 31 mm
Weight	345 g

Impact Device D

Universal Standard unit. Perfect for the majority of hardness testing assignments.

Impact Device DC

Extremely short impact device. Spring loaded with a special loading stick. Otherwise as for type D. Ideal in very confined spaces, e.g. in holes, cylinders or for internal measurements on assembled machines.

Impact Device D+15

Particularly slim front section and with measuring coil moved back. For hardness measurements in grooves and on recessed surfaces.

Impact Device DL

Needle front section diameter 4.2 mm, length 50 mm. Perfect for measurements in extremely confined spaces.

Impact Device C

Reduced impact energy (approximately ¼ of that for type D). Ideal for surface hardened components, coatings, thin walled or impact sensitive components (small measuring indentations).

Impact Device G

Enlarged test tip, increased impact energy (approximately 9 times that of type D). Low demands on measuring surface finish. For measurements in the Brinel range only (max. 650 HB). Ideal for Solid components, e.g. heavy castings and forgings.

Impact Device E

Synthetic diamond test tip (approximately 5000 HV). For measurements in the extremely high hardness range (always in excess of 50 HRC/650 HV). Tool steels with high carbide content inclusions. For measurements up to 1200 HV.

Support rings

On curved surfaces having a radius of under 30mm, effective positioning on the component is facilitated by the use of support rings. This ring can be screwed on front of the impact device.

Set of 7 rings:
Convex: 10-15mm, 14.5-30mm, 25-50mm
Concave: 11-13mm, 12.5-17mm, 16.5-30mm
Universal: one model

Printer

Thermal printer for M295

M295 Portable Hardness Tester