Steel Balls, Steel Ball Bearings - Jeng Ker Industrial Corp.Steel Ball Manufacturer - Jeng Ker Industrial Corp., Cheau Chia Enterprise Co., Ltd.
Nominal Diameter Hardness on Spherical Surface   Nominal Diameter Hardness on Spherical Surface
inch mm Rockwell "C" scale inch mm Rockwell "C" scale
- 0.5 (62-67)
HRC on parellel fats, calculated from Vickers hardness observed
29/64 - 60.0-65.0
- 0.6 15/32 -
- 0.7 - 12 60.0-65.5
1/32 - 31/64 -
- 0.8 1/2 -
- 1 - 13
3/64 - 17/32 -
- 1.2 - 14
- 1.5 9/16 -
1/16 - - 15
5/64 - 19/32 -
- 2 5/8 -
3/32 - - 16
- 2.5 21/32 -
7/64 - - 17 61.0-66.0
- 3 11/16 -
1/8 - 54.0-59.5 - 18
- 3.5 54.5-60.5 23/32 -
9/64 - - 19
5/32 - 55.5-61.5 3/4 -
- 4 25/32 -
11/64 - 57.0-62.5 - 20
- 4.5 13/16 -
3/16 - - 21
- 5 57.0-62.5 27/32 -
- 5.5 57.5-63.0 - 22
7/32 - 7/8 -
- 5.8 - 23
15/64 - 58.0-63.5 29/32 -
- 6 15/16 -
1/4 - - 24
- 6.5 31/32 -
17/64 - - 25
- 7 1 -
9/32 - - 26
- 7.5 1/16 -
19/64 - - 28 61.0-66.5
5/16 - 59.0-64.5 1/8 -
- 8 3/16 -
- 8.5 1/4 -
11/32 - - 32
- 9 5/16 -
23/64 - - 34
- 9.5 59.5-65.0 3/8 -
3/8 - - 35
25/64 - - 36
- 10 7/16 -
13/32 - 60.0-65.0 - 38
- 11 1/2 -
7/16 - 9/16 -
- 11.5 - -