NO.

Type

Material

Hardness 
Test Range

Sample Size(mm)

1

W-20

Aluminium Alloy

25~110 HRE
58~131 HV

Thickness 0.6-6
Inner diameter <10

2

W-20a

Thickness 0.6-13
Inner diameter <10

3

W-20b

Thickness 0.6-8
Inner diameter >6

4

W-B75

Hard or Semi-hard Brass,
Super Hard Aluminium Alloy

63~105 HRF

Thickness 0.6-6
Inner diameter >10

5

W-B75b

Thickness 0.6-8
Inner diameter >6

6

W-BB75

Soft Brass,Red copper

18~100 HRE

Thickness 0.6-6
Inner diameter >10

7

W-BB75b

Thickness 0.6-8
Inner diameter >6

8

W-B92

Cold Rolled steel,
Stainless steel

50~92 HRB

Thickness 0.6-8
Inner diameter >10