55 SiMoVA roller and ball, this product mainly used for oil drill, drill ore in parts.

SMALLEST AND BIGGEST DIAMETER (AND LENGTH):

Size: Φ 6mm-25mm

Length:10mm-45mm

Precision grade: 0-0.005mm

Chemical composition details:(similiar AISI S2)

 C: 0.52-0.55     SI: 0.90-1.20    Mn: 0.30-0.50    P: ≤0.030    S: ≤0.030   Mo: 0.30-0.60    V: ≤0.50 

ROLLER FOR DRILLING TOOLS