Bits for underground drilling

   

Model -17

2+3 gauge buttons, 2 front buttons

One front and two side flushing holes.

Model -27

2+3 gauge buttons, 2 front buttons

With its large gauge buttons, model -27 is ideal for medium-hard to hard abrasive rock. Available with spherical or ballistic (-67) buttons.

Model -34

3+3 gauge buttons, 2 front buttons

Model -34 offers very good penetration. Ideal for most rock formations including hard rock. Available with spherical or ballistic (-67) buttons.

Model -37

2+2+2 gauge buttons, 3 front buttons

With 9 buttons and superb flushing, model -37 bits offer very good penetration. Ideal for most rock formations including hard rock with heavy frontal wear on the bit. Available with spherical or ballistic (-67) buttons.

Model -27-30

Guide bit. Square skirt

Ideal where hole deviation is a problem. Longer service life, better penetration rate and longer grinding intervals compared to a cross-type bit, which is normally used to avoid hole deviations. Suitable for most rock formations including hard rock. Available with spherical or ballistic (-67) buttons.

Model -37-30

Guide bit. Square skirt

Ideal where hole deviation is a problem. Longer service life, better penetration rate and longer grinding intervals compared to a cross-type bit, which is normally used to avoid hole deviations. Suitable for most rock formations including hard rock. Available with spherical or ballistic (-67) buttons.

Model -39

2+2+2 gauge buttons, 3 smaller front buttons

With its larger gauge buttons, model -39 is ideal for abrasive rock. Available with spherical or ballistic (-67) buttons.

Model -41

2+3 gauge buttons, 2 front buttons

For medium-hard to hard rock formations. Available with spherical or ballistic (-67) buttons. Inclined front.

Model -42

Reaming bit. Dome-shaped front

Model -42 is an alternative to traditional reaming equipment. Use in a pre-drilled pilot hole. Tried and tested with excellent results.

Model -56

2+2 gauge buttons, 2 smaller front buttons

Traditionally used in hard rock formations, model -56 delivers excellent penetration rate. Available only with spherical buttons.

Cross-type bit

4 chisel inserts in cross formation

Traditional insert bit for extremely abrasive rock formations. Ideal for soft formations that cause "snakeskin" problems for carbide. Produces straight holes but has lower penetration than button bits.