we could produce long spiral drilling bit in various outer diameters and different pitches subject to demand of customers.

Technical Parameters of Spiral Drill Rod

Outer Diameter of Drilling Tool (mm)	Diameter of Drill Pipe (mm)	Pitch  (mm)	Thickness of Screw Piece (mm)	Connecting party
400	180	330	16	150*150
500	180	330	16	150*150
600	219	400	20	150*150
800	219	500	20	200*200
1000	219	500	20	200*200
1200	219	600	20	200*200
1500	219	600	20	200*200

NOTE: we could produce long spiral drilling bit in various outer diameters and different pitches subject to customers’demand.

Long spiral drill bit