4 Inch Air-Powered Mining Tools Rock Drilling Bits for deep well/foundation & pile/water well/blasting hole/quarry
Shank: Wooke40/DHD340/ SD4/QL40/Mission40/BR4

Hole range: Ø105-ø130mm
Commonly used diameter: Ø108, ø115, ø121, ø127, ø130 mm
Application field: blasting hole, geothermal hole.

Face design: flat, convex, concave

Inserts design: spherical, ballistic, convex

Features:  

1.Reliable quality, long service life,  rare abnormal breakage during service life.

 2.Good flushing effect to ensure high drilling rate

3.Strict quality warranty and compensation rules

Bit face shape selection:
1. Drop Center Bit
For high penetration rates in soft to medium hard and fissured rock formations. Low to medium air pressures. Maximum hole deviation control.
2. Concave Face
The all-round application bit face specifically for medium hard and homogenerous rock formations. Good hole deviation control and good flushing capacity.
3. Convex Face
For high penetration rates in soft to medium-hard with low to medium air pressures. It is the most resistance to steel wash, and may reduce the load and wear on the gauge buttons, but poor hole deviation control.
4. Double Gauge Face
This kind of face shape is suitable for fast penetration rates in medium to hard rock formations. Designed for high air pressures and good resistance to steel wash step gauge bit.
5. Flat Face Bit
This kind of face shape is suitable for hard to very hard and abrasive rock formations in applications with high air pressures. Good penetration rates an resistance to steel wash.