DTH drill bits 4inch

 DTH button bits 4” 

How to choose the right button bits?

ROSCHEN has a comprehensive range of DTH drill bits to match all conceivable applications. Each bit is made from quality alloy steel, and has been precision machined to produce a perfect body, heat treated to the required hardness, given surface compression for fatigue resistance, and fitted with precision buttons manufactured in-house. These are designed for specific applications for all rock types, hardness's and condition. Bit life and rate of penetration are the most important criteria in selecting the right bit for a particular application.

 

How to select Bit Face Shape?

 

NO.1  Concave Face

The all-round application bit face specifically for medium hard and homogeneous rock formations.

Good hole deviation control and good flushing capacity.

 

NO.2 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.

NO.3 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.

 

NO.4 Flat Face

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 can resistance to steel wash.

 

 

NO. 5 Drop Center

For high penetration rates in soft to medium hard and fissured rock formations.  Low

 to medium air pressures. Maximum hole deviation control.

 

NO.6 Pineapple Face

The Pineapple Bit can be dressed with ballistic buttons for use in soft to medium hard formations where fractured rock can be expected, or can be supplied with spherical buttons for hard and abrasive formations. 

Specifications: