NUMA Shank DTH Drill Bit

NUMA DTH Drill Bit is widely used in Big Hole Drilling. We supply the NUMA DTH Bit diameter range from 254mm to 508mm....

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GMD could supply the NUMA series DTH Drill Bit with cemented carbide buttons have very good wear-resistant. Buttons are strong in the mining process and could meet requirements of various rocks , and the service lifetime is very long. 

Meanwhile, GMD could supply lots of grades DTH Bits, they can be chosen according have a good performance.  


Shank Type: NUMA100, NUMA120, NUMA 125

Bit Diameter: 254mm-508mm

Bit Face: Flat Face, Convex Face, Concave Face, Drop Center, Double Gauge.


Details, kindly check below:

Bit Face and Carbide Design





How to Choose Right DTH Bit Face Design?

The following shows the three face designs provided within the industry and describes their main attributes and possible drawbacks. Within each design there can be multiple options to suit your particular needs.


Face Designs




The concave bit design is an excellent all around bit, suitable for soft and hard formations. The cone shaped face design provides good stability during drilling, allowing for straighter holes while reducing equipment vibration. The carbide configuration gives added penetration in many formations.




Suitable for most drilling applications, particularly hard, abrasive rock to give a combination of speed and good service life.


Flat Face


Used for general purpose drilling, the flat face design is considered effective in very broken ground as well as hard formations and softer formations that tend to over drill.


Key Words:

NUMA DTH Drill Bit


Numa Series DTH Bits

DTH Bits for Hard Rock Drilling

NUMA Shank DTH Bit

dth drill bit



The information you may like to know before order: 

1. Q:Methods of Payment:

   A: T/T (Telegraphic Transfer) or Western Union or L/C at sight

2. Q: Handling time for an order

   A: Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.

3. Q: Shipping way

   A: Sample order: we suggest Courier express like DHL/UPS/TNT/FEDEX or by air

     Bulk order: we suggest by air or by sea.

4. Q: Quality Control

   A: We have our own experienced QC.

  There will be strict inspection and testing for every order before shipping out.

5. Q: After Services:

   A: (1). Our sales team will response for your question within 24 hours (Holidays


      (2). Technical Support will be available in any time

      (3). Free replacement will provide once the failure confirmed caused by our product quality

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