Different length and diameter of steel Drill rods and their coupling is as follows:
Length (mm)
Outer diameter(OD) (mm)
1500
3000
50
42
Length (L) (mm)
Outer diameter (OD)
300
BW/L
HW/L
Diamond bits and reaming shells | Corbarrels | Casing and adaptors | Inflatable grouting packers | Goelogical drilling rigs