Chrome steel balls Specification

Chrome Steel 52100 is a universal material for many applications. Chrome steel balls have an excellent surface quality and high load bearing. TRD produces balls that through statistical process control, assures tolerance accuracy, fine surface finish and a consistent high quality. Our chrome steel balls are available in fractional, decimal and millimeter sizes.

The specification of bearing steel ball:

Diameter (d)

Diameter (d)

Inch

Millimeter

Inch

Millimeter

 
2
 
8.5
3/32
2.381
11/32
8.731
 
2.5
 
9
 
3
23/64
9.132
 
3.1
3/8
9.525
1/8
3.175
13/32
10.319
 
3.5
15/32
11.006
5/32
3.969
7/12
11.113
 
4
31/64
12.303
 
4.5
1/2
12.70
3/16
4.763
9/16
14.28
 
5
9/32
15.81
 
5.5
5/8
15.875
7/32
5.556
11/16
17.463
15/64
5.953
 
18
 
6
23/32
18.256
1/4
6.35
3/4
19.05
 
6.5
25/32
19.844
 
7
 
20
9/32
7.144
27/32
21.431
 
7.5
7/8
22.225
5/16
7.938
31/32
24.606
 
8
1
25.4
5/8
15.8750
1 3/4
44.4500
21/32
16.6688
 
45.0000
11/16
17.4625
1 7/8
47.6250
23/32
18.2562
 
50.0000
3/4
19.0500
2    
50.8000
13/16
20.6375
2 1/8
53.9750
7/8
22.2250
 
55.0000
29/32
23.0188
2 1/4
57.1500
15/16
23.8125
 
60.0000
1     
25.400 
2 3/8
60.3250
1 1/16
26.9875
2 1/2
63.5000
1 1/8
28.5750
 
65.0000
 
30     
2 3/4
69.8500
1 3/16
30.1625
 
70.0000
1 1/4
31.7500
 
75.0000
 
32     
3    
76.2000
1 5/16
33.3375
 
80.0000
 
34     
3 1/2
88.9000
1 3/8
34.9250
 
90.0000
 
35     
 
100.0000
Grade of tolerance and technology requirement
Grade Ball diameter variation Spherical deviation Ball surface roughness Ball diameter variation Basic diameter tolerance
Vdws ?Sph Ra Vdwl Tdn
Not exceed not over
um
10 0.25 0.25 0.025 0.5 *
16 0.4 0.4 0.032 0.8 *
20 0.5 0.5 0.05 1 *
28 0.7 0.7 0.05 1.5 *
40 1.0 1.0 0.08 2 *
60 1.5 1.5 0.10 3 *
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
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