You can quickly determine if a 3-inch high-pressure air hammer is a suitable choice by answering the following questions:

• Target rock formation: Is it medium-hard to very hard rock (such as granite, basalt)?

• Drilling requirements: Is high drilling efficiency and speed required?

• Project conditions: Is it feasible to equip a high-power air compressor (>30kW) and handle high noise levels?

• Drilling depth: Is the groundwater level within 200 meters?

• Hole diameter range: Is the target borehole diameter within the common range of 90mm to 445mm?

If the answer to most of the above questions is "yes," then the 3-inch DTH hammer would be a good choice.

Detail

Technical specifications

Model	ND35A	ND45A	ND55A	ND65A	ND75A	ND85A
Length(Lessbit)	886mm	986mm	1122mm	1210mm	1225mm	1354mm
Weight (Lessbit)	24.2kg	40.5kg	70kg	106kg	143.5kg	193
Outer Diameter	Φ82mm	Φ99mm	Φ126mm	Φ148mm	Φ165mm	Φ185mm
Hole Range	Φ90-115mm	Φ110-135mm	Φ136-155mm	Φ158-203mm	Φ178-216mm	Φ198-254mm
Connection Thread	API2 3/8"REG	API2 3/8"REG	API2 3/8"REG	API3 1/2"REG	API3 1/2"REG	API4 1/2"REG
Working Pressure	1.0-1.7MPa	1.0-2.2MPa	1.0-2.5MPa	1.2-2.5MPa	1.5-2.8MPa	1.5-3.3MPa
Recommended rotation speed	30-50 r/min	30-60 r/min	30-60 r/min	30-60 r/min	30-60 r/min	30-60r/min
Air consumption	4m³/min (1.0MPa)	5m³/min (1.0MPa)	7m³/min (1.0MPa)	16m³/min (1.8MPa)	21m³/min (1.8MPa)	25m³/min (1.8MPa)
Air consumption	6.5m³/min (1.5MPa)	9m³/min (1.8MPa)	13m³/min (1.5MPa)	23m³/min (2.4MPa)	28m³/min (2.4MPa)	34m³/min (2.4MPa)

Parts	Weight (kg)
Top Sub	4.5	8.1	14	21.5	31.2	38.5
"O" Ring	0.01	0.01	0.01	0.01	0.01	0.02
Disc Spring	/	/	/	0.34	0.5	/
Check Valve	0.13	0.3	0.6	0.56	0.65	0.65
Spring	0.02	0.04	0.06	0.05	0.09	0.1
Valve Seat	0.76	1.5	2.15	4.3	5.5	6.2
Inner Cylinder	1.45	2.1	3.3	4.2	5.5	7.4
Piston	4.8	8.4	15.5	23	34.5	44.5
Piston Case	9.5	15	24.2	36.5	47	69.5
Guided Sleeve	0.9	1	2.64	6.3	5.65	6.1
Check Ring	/	/	/	0.02	0.02	/
Retainer Ring	0.15	0.2	0.5	1	/	1.2
"O" Ring	0.01	0.01	0.01	0.01	1.3	0.01
Drive Chuck	1.9	3.6	7	8.2	11.5	19.3

Why choose us

Based on parameters provided by the customer, such as geological conditions, target depth, boreholediameter, and budget, we provide optimal equipment selection recommendations and detailedequipment performance data.
Provide a complete and transparent equipment configuration list and quotation, with no hidden fees.
Honestly inform customers of the equipment's performance limits and precautions under differentoperating conditions, without exaggeration.
Clear contract terms, clearly defining the rights and responsibilities of both parties, deliverystandards, acceptance methods, and payment schedules.

Collaboration Cases

Our factory not only focuses on product manufacturing, but also has established a comprehensive global service network. We have localized service teams in major markets in Africa and Asia, providing timely technical support, installation guidance, and after-sales service to ensure customer satisfaction.