... 20 years experience in special fastener 1,Name: Deep groove ball bearing;Deep groove bearing;Ball bearing2,For the similar bearing,what ... ,4.8,5.6,6.8,8.8,9.8,10.9,12.9,etcCarbon steelGr.B,Gr.C,Gr.D ... industry is machined hardware fastener ,especially the cutting/turning parts. Deep groove ball bearing