high strength DTH hammer bits button drill bit for well and mining drilling

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Product Description

8'' (inch) Atlas Copco DTH Button Bits

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.

Carbide button shape selection:

1. Domed/Round Button

2. Parabolic/Semi-Ballistic Buttons

3. Ballistic Button

4. Sharp Button

5. Flat Button

8" Rock Drilling Bits

Drill Bit	Bit Dia. (mm)		Air Holes No.	Gauge Buttons	Front Buttons
Drill Bit	mm	inch	Air Holes No.	Gauge Buttons	Front Buttons
ND85(DHD380,COP84)	203	8	2	10*Φ18	10*Φ16
	216	8 1/2	2	10*Φ18	12*Φ16
	241	9 1/2	2	12*Φ18	18*Φ16
	254	10	3	12*Φ18	21*Φ16
	305	12	4	12*Φ18	29*Φ16
SD8	203	8	2	10*Φ18	10*Φ16
	216	8 1/2	2	10*Φ18	12*Φ16
	241	9 1/2	2	12*Φ18	18*Φ16
	254	10	3	12*Φ18	21*Φ16
	305	12	4	12*Φ18	29*Φ16
QL80	203	8	2	10*Φ18	10*Φ16
	216	8 1/2	2	10*Φ18	12*Φ16
	241	9 1/2	2	12*Φ18	18*Φ16
	254	10	3	12*Φ18	21*Φ16
	305	12	4	12*Φ18	29*Φ16
Mission 80	203	8	2	10*Φ18	10*Φ16
	216	8 1/2	2	10*Φ18	12*Φ16
	241	9 1/2	2	12*Φ18	18*Φ16
	254	10	3	12*Φ18	21*Φ16
	305	12	4	12*Φ18	29*Φ16

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high strength DTH hammer bits button drill bit for well and mining drilling

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