Length    (Less bit)	Weight  (Less bit)	External diameter	Bit Shank	Hole Range		Connection Thread
1102mm	68.00kg	Φ125mm	HD55C DHD350Q	Φ135-Φ155		API2 3/8”Reg   API3 1/2”Reg
Working Pressure	Impact rate at 1.7Mpa	Recommended rotation speed		Air consumption
				1.0Mpa	1.8Mpa		2.4Mpa
1.0-2.5Mpa	28HZ	20-35r/min		8m³/min	14m³/min		19m³/min

Item Description	Weight (kg)	Part Number
1. Top Sub 2. “O” Ring of Top Sub 3. Check Valve 4. Spring 5. Air Distributor 6. Internal Cylinder 7. Piston 8. External Cylinder 9. Guided Sleeve 10. “o” Ring of Stop Ring 11. Stop Ring 12. Drive Chuck 13. Drill Bit	13.70 0.015 0.70 0.10 2.00 2.80 15.00 25.00 3.20 0.01 0.50 4.00 15.90	ND55CA01 ND55CA02 ND55CA03 ND55CA04 ND55CA05 ND55CA06 ND55CA07 ND55CA08 ND55CA09 ND55CA10 ND55CA11 ND55CA12 ND55CA13

It is a kind of high air pressure DTH Hammer without footvalve, our newest design. It is also one of the most advanced DTH Hammers in the world.
It has the following advantages:
1. Out of the trouble of foot valve fracture and expansion and contraction.
2. Lower energy consumption and higher impact frequency. The drilling speed is 15%-30% higher than the one with foot valve.
3. Simple structure, reliable parts, long life, easy and cheap maintenance.
4. Lower air and oil consumption. The oil consumption is about 10% lower than the one with foot valve.