Impact Devices for mitech hardness testers

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Impact devices

7 Types of imapct devices are available for all mitech portable hardness testers and their special applications.

	Impact Device D Universal standard unit, for majority of hardness testing
	Imapct Device DC Extrmely short impact device,spring loaded with a special stick. Used in very confined spaces, e.g. in holes,cylinders or for internal measurements on assembled machines.
	Impact Devices C Reduced impact energe, appoximately 1/4 of D type. Applications: surface hardened components, coatings, thin walled or impact sensitive components (small measuring identation).
	Impact Device D+15 Particularly slim front section and with measuring coil moved back; Hardness measurements on grooves and on recessed surfaces.
	Impact Device DL Needle front section, diameter 4.2 mm, length 50 mm, measurements on extremly confined spaces.
	Imapct Device E Synthetic diamond test tip (approximately 5000 HV), For measurements on extremly high hardness range (always in excess of 50 HRC/ 650 HV), tool steels with high carbide content inclusions. For measurements up to 1200 HV.
	Impact Device G Enlarged test tip, increased impact energy (approximately 9 times that of type D), low demands for measuring surface, for measurements in Brinell only (Max. 650 HB). Applications: solid components, e.g. heavy castings and forgings.

Measuring range of impact devices

Material	Method	Impact device
Material	Method	D/DC	D+15	C	G	E	DL
Steel and cast steel	HRC	20～68.5	19.3～67.9	20.0～69.5		22.4～70.7	20.6～68.2
	HRB	38.4～99.6			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
Cold work tool steel	HRC	20.4～67.1	19.8～68.2	20.7～68.2		22.6～70.2
Cold work tool steel	HV	80～898	80～935	100～941		82～1009
Stainless steel	HRB	46.5～101.7
	HB	85～655
	HV	85～802
Grey cast iron	HRC
	HB	93～334			92～326
	HV
Nodular cast iron	HRC
	HB	131～387			127～364
	HV
Cast aluminium alloys	HB	19～164		23～210	32～168
Cast aluminium alloys	HRB	23.8～84.6		22.7～85.0	23.8～85.5
BRASS(copper-zinc alloys)	HB	40～173
BRASS(copper-zinc alloys)	HRB	13.5～95.3
BRONZE(copper-aluminium/tin alloys)	HB	60～290
Wrought copper alloys	HB	45～315
Available type of impact device		DC: Test hole or hollow cylindrical	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 steel	E: Test super high hardness material	DL: Test slender narrow groove or hole

Specifications of impact devices

Type of impact device

DC(D)/DL

D+15

C

G

E

Impacting 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:

Dia. Test tip:

Material of test tip:

1600HV

3mm

Tungsten carbide

1600HV

3mm

Tungsten carbide

1600HV

3mm

Tungsten carbide

1600HV

5mm

Tungsten carbide

5000HV

3mm

synthetic 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

Mean roughness value of sample surface Ra:

1.6μm

1.6μm

0.4μm

6.3μm

1.6μm

Min. 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. layer thickness for surface hardening

5mm

≥0.8mm

5mm

≥0.8mm

1mm

≥0.2mm

10mm

≥1.2mm

5mm

≥0.8mm

Support rings
suppor rings

No.	Type	Remarks
1	Z10-15	For testing cylindrical outside surface R10～R15
2	Z14.5-30	For testing cylindrical outside surface R14.5～R30
3	Z25-50	For testing cylindrical outside surface R25～R50
4	HZ11-13	For testing cylindrical inside surface R11～R13
5	HZ12.5-17	For testing cylindrical inside surface R12.5～R17
6	HZ16.5-30	For testing cylindrical inside surface R16.5～R30
7	K10-15	For testing spherical outside surface SR10～SR15
8	K14.5-30	For testing spherical outside surface SR14.5～SR30
9	HK11-13	For testing spherical inside surface SR11～SR13
10	HK12.5-17	For testing spherical inside surface SR12.5～SR17
11	HK16.5-30	For testing spherical inside surface SR16.5～SR30
12	UN	For testing cylindrical outside surface, radius adjustable R10～∞

MITECH INSTRUMENT CO.,LTD
Address:Room 1405,YiHai Plaza,16# TsingHua Road,Haidian District,Beijing,China
Telephone: 86-10-51284068 Fax:86-10-51733675
Email: lufy@mitech-world.com
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