The series HD hammer developed and manufactured by Changsha heijinGang Co.,Ltd is one of the most advanced valveless high air press DTH hammer in China.
It has following advantages:
1. Deliver maximum energy to drilling bit, fast drilling speed and low air consumption due to inner structure of HD series DTH hammer designed according to newest rock drilling theory.
2. Smooth performance and long service life of HD series DTH hammer due to high quality alloy steel materials and advanced processing technology adapted.
3. Low problem rate and easy to maintenance due to simple , reliable and easy assemble and disassemble inner structure of hammer.
4. Easy to depart bit from hammer due to multi—head thread connecting chuck and cylinder of hammer.
Interchangeable with DTH bit and dill pipe manufactured by Atlas copco and Ingersoll-rand.
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Explanation of product code
For example HD55
H—Hard Hammer
D—Down- the hole drill
5—5" hammer
5— the fifth generation hammer 
