Hunan New Diamond Construction Machinery Co., Ltd.
Hunan New Diamond Construction Machinery Co., Ltd.

Hunan New Diamond Construction Machinery Co., Ltd.

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Rock Drill Accessories Borewell Hammer

Rock Drill Accessories Borewell Hammer

  • Rock Drill Accessories Borewell Hammer
Rock Drill Accessories Borewell Hammer
Product Details:
Place of Origin: Hunan, China (Mainland)
Brand Name: New Diamond
Certification: ISO9001:2008
Model Number: NM series Hammer
Payment & Shipping Terms:
Minimum Order Quantity: Negotiable
Price: Negotiable
Packaging Details: Carton packaging and wooden box packing
Delivery Time: 5-8 work days
Payment Terms: L/C, T/T, Western Union
Supply Ability: According to order quantity
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Detailed Product Description
Length(Without Bit): 1005mm-1338mm External Diameter: Ø99mm-Ø185mm
Hole Range: Ø110-Ø254mm Bit Shank: NM4/NM5/NM6/NM8
Machine Type: Drilling Equipment Working Pressure: 1.2-3.0Mpa
High Light:

downhole drilling tools


dth drilling tools


Rock Drill Accessories Borewell Hammer


DTH hammers are used for blast hole drilling and water well drilling project.Working with DTH drilling pipe and DTH drill bit, mainly applied in Mining,Marble quarry or well drilling and other construction projects.

Down the hole rock tools (drilling tools) are rock drilling equipment which takes compressed air as power source to partially transfer impact power into drilling holes. An air distributing device in a top hammer controls a piston to move back and forth. An impact device arranged in the front of the top hammer transfers the impact powderto a down-the-hole bit to crush rocks.


A, using the raw material of super coarse grain hard alloy, the alloy has been sintered under pressure to improve the hardness and toughness of the bit.

B, unique design, improve drilling speed, use significantly improve life.

C, select advanced steel to ensure that the overall performance of the bit is consistent.

D, after sale guarantee, to replace the bad goods package.



Widely used in mines, quarries, earthworks and other engineering drilling blasting hole, guardrail hole, mountain reinforcement, anchorage and other engineering holes, geothermal exploration hole, Well bore and other fields.



NM Series High Air Pressure DTH Hammers Without Foot Valve

Technical Data

Length(Without Bit) NM4A NM5A NM6A NM8A
1005mm 1110mm 1161mm 1338mm
Weight(Without Bit) 40.00kg 68.50kg 90.00kg 176.00kg
External Diameter Ø99mm Ø126mm

Ø142mm Ø144mm

Ø146mm Ø148mm

Bit Shank NM4 NM5 NM6 NM8
Hole Range Ø110-Ø135mm Ø155-Ø190mm Ø155-Ø203mm Ø195-Ø254mm
Connection Thread API2 3”/8REG

API2 3”/8REG

API3 1”/2REG

API2 7”/8REG

API3 1”/2REG

API2 7”/8REG

2 7”/8 IF

API4 1”/2REG
Working Pressure 1.2-2.0Mpa 1.3-2.3Mpa 1.5-2.5Mpa 1.5-3.0Mpa
Impact Rate at 17 Bar 30HZ 28HZ 25HZ 22HZ
Recommended Rotation Speed 25-40r/min 20-35r/min 20-30r/min 15-25r/min
Air Consumption














Feature Advantage

1 Price commitment: in order to ensure the high reliability of products, high-quality brand products are selected for raw material selection. Under the same competitive conditions, the products will be provided to customers at a favorable price without reducing the technical performance of products.

2 Quality commitment: the manufacture and inspection of the products have quality records and testing data, and the performance of the products can stand the customer's inspection.


3 Customer service: in order to create new Jingang brand, enhance corporate reputation and set up corporate image, we serve customers with the principle of "preferential price, considerate service and reliable product quality".


The appearance of the picture is different from that of the actual product, and the actual product is the standard.

Rock Drill Accessories Borewell Hammer 0



Rock Drill Accessories Borewell Hammer 1

NM Series High Air Pressure DTH Hammers Without Foot Valve
Item Description Weight(kg)
1,Top Sub 6.50 13.70 20.00 34.00
2,“O” Ring Of Top Sub 0.10 0.015 0.015 0.015
3,Breakout Ring - - - 0.30
4,Chenck Valve 0.35 0.70 0.70 1.20
5,Spring 0.05 0.10 0.10 0.10
6,Air Distributor 1.50 2.00 3.50 6.00
7,Internal Cylinder 2.10 2.80 4.20 6.50
8,Piston 8.50 15.00 23.00 42.50
9,External Cylinder 14.80 24.00 26.00 61.00
10,Guided Sleeve 1.80 2.60 4.80 5.30
11,“O” Ring Of Stop Ring 0.005 0.01 0.01 0.01
12,Stop Ring 0.30 0.70 0.80 1.50
13,Breakout Ring - - - 0.30
14,Drive Chuck 3.80 6.50 4.20 17.30
15,Drill Bit 6.60 13.50 23.00 31.00

Contact Details
Hunan New Diamond Construction Machinery Co., Ltd.

Contact Person: Rick.liao

Tel: +8618692219720

Send your inquiry directly to us
Hunan New Diamond Construction Machinery Co., Ltd.
PinJiang Industry Park,PingJiang county,YueYang City,Hunan,China.
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