TDD,born for drilling. 

TDD group have been focusing on DTH drilling for 16 years. We are specialized in manufacturing various DTH drilling hammers、matched drilling bits、drilling rigs and drilling pipes for water wells、mines and oil industries.

TDD has been promoting productivity in drilling industry, SPM ensure the safety and stability of drilling engineering, and provide professional, efficient and reliable whole drilling solutions. 

TDD have made tremendous development at the basic of high-quality, low price, good service since its establishment. All friends both at home and abroad are warmly welcomed to come here to establish and develop business relationship with us. 

TDD Symmetric overburden  DTH drill bit is made of a hard alloy blade and steel. It is widely used in the protection of water well drilling .

 technical parameter:

Product advantages:

1. The follow-up reaming drilling tool is composed of a central bit, a reaming block and a rod stabilizer. In the drilling operation, the reaming block expands large enough holes to allow the casing to dive after it, and the dust is blown away from the casing at the same time. 

2. When the drilling reaches a certain depth, the reaming block will be rotated and recovered when the drilling tool is lifted or slightly reversed, and the drilling tool can be removed from the casing. 

3. Pull the casing up and spray the concrete slurry or other fillers at the bottom of the hole. 

4. The conventional DTH bit can be put into the bottom of the hole from the casing and continue to drill, and the DTH bit equipment can be used to drill to the desired depth.