The threaded hole(s) / drilling hole(s) can be machined by conventional drilling and tapping methods on the AISI 201 / 304 stainless steel ball, brass ball, soft / mild steel ball. There are blind hole, through hole, single hole, dual holes, triple holes, parallel holes
As for drilling hole(s) on steel ball, the ball can be solid as well as hollow. But only the solid ball can be threaded, the specifications are the Coarse Thread ( M3-M30 ) and Fine Thread ( M3-MF48 ). You should know the exact size of threaded steel ball when inquiring, or send us your sample to check the specifications.