Contact info

Name: Linda
Tel: +86-13305389275
Fax: +86-538-5685009
Mobile: +86-13305389275
E-mail: info@steelball0.com
Add: Maozhuang steel ball Zone, ningyang, shandong China.
MSN: chinasteelball@homail.com
Skype: linda82721
MSN: chinasteelball@homail.com SKYPE: linda82721
Home> information--Steel ball precision grade standard

information--Steel ball precision grade standard

 Standards & Tolerances(ISO 3290-1998)


Grade
Variation of
ball diameter
VDws Max.
Deviation from
sherica from
tDw Max.
Surface
roughness
Ra Max.
Lot diameter
Variation
VDwl Max.
G3
0.08
0.08
0.010
0.10
G5
0.13
0.13
0.014
0.25
G10
0.25
0.25
0.020
0.5
G16
0.4
0.4
0.025
0.8
G20
0.5
0.5
0.032
1
G24
0.6
0.6
0.040
1.2
G28
0.7
0.7
0.050
1.4
G40
1
1
0.060
2
G60
1.5
1.5
0.080
3
G100
2.5
2.5
0.100
5
G200
5
5
0.150
10
G500
12.5
12.5
 
25
G1000
25
25
 
50
Unit:um
 
 
 
 
Standards & Tolerances(ISO 3290-1998)


 

Symbols

Ball diameter variation 
VDws=Dw max.-Dw min.
Lot diameter variation
VDwl=Dw max.-Dw min.
Deviation from
spherical form
Ball mean diameter
Dwm=Dw max.+Dw min.
2
Lot mean diameter
Dwml=Dwm=Dw max.+Dwm min.
2
tDw=rc-rp



 
Standards & Tolerances(ISO 3290-1998)


 

ANSI/AFBM Std 10-1989(Revision of 1983)


Ball Grade
Allowable Ball Diamtter Variation
Allowable Deviation From Spherical Form
Maximum Surface Roughness Arithmetic Average
Allowable lot Diameter Variation
Nominal Ball Diameter Tolerance
Allowable Ball Guage Deviation
Contaier Marking Increment
 
VDWS(um)

△Rw(um)
Ra(um)
VDWL(um)
(um)
△S
 
3
0.08
0.08
0.012
0.13
*
+0.75 -0.75
0.25
5
0.13
0.13
0.02
0.25
*
+1.25 -1.00
0.25
10
0.25
0.25
0.025
0.5
*
+1.25 -1.00
0.25
16
0.4
0.4
0.025
0.8
*
+1.25 -1.00
0.25
24
0.6
0.6
0.05
1.2
*
+2.50 -2.50
0.25
48
1.2
1.2
0.08
2.4
*
*
1.25
100
2.5
2.5
0.125
5

±12.5
*
 
200
5
5
0.2
10

±25
*
 
500
13
13
*
25

±50
*
 
1000
25
25
*
50

±125
 
 

Rockwell Hardness

 


MATERIAL
Rockwell Hardness
Carbon Steel
AISI1010/1015
HRC 60
Chrome Steel
AISI52100
HRC 60-66
Stainless Steel
(Corrosion Resisting Hardened Steel)
AISI440
HRC 58-65
AISI420
HRC 52min
Stainless Steel
(Corrosion Resisting Unhardened Steel)
MAGNETIC
ASI 304/316
HRC 25-39
NON MAGNETIC
ASI 304/316
NA

 



tml>