Standard 技术标准
- Deutsche Norm DIN5401-2002
- 形状及び表面粗さの許容限界値
- 等級及びゲージ
- 硬さ
- American Standard 10A-2001
- 中国标准 GB308-2002
- American Standard for carbon layer of low carbon steel ball
- Bearing ball crushing standard
- Crushing load of carbon steel ball
