Small Hole Range Size Drilling Bits IR DHD3.5 90mm Down The Hole Bits

Our Products:
With professional manufacturing experience in DTH hammer production, our factory can supply you with high
pressure and medium to low pressure DTH hammers. It strictly matches with API standard and other Chinese industry standards.It is durable for being produced with advanced craftwork and good material.
Products Description
DHD3.5 DTH Hammer Bits

Features
1. Simple and reasonable design, Low problem rate, long life.
2. Strict quality controlling, selected high quality special steels and carbide.
3. Produced by CNC machines, low air consumption, smooth drilling, Maximum impact power, High penetration rate.


Products Photos:




How to Chose the Right Products
Choosing the right hammer is determined by drill machines (mainly compressor output), drilling hole size and type of rock formation.Ideally, the size of the hammer should match the required hole dimension as closely as possible, leaving just enough space for compressed air to flush cuttings and clean the hole.

The optimum range of hole size for blast-hole drilling with DTH method is 90~254 mm (3-1/2"~ 10") with 3.5 ~ 8" hammers.Smaller blast holes are generally drilled with top-hammer tools, while larger holes typically with rotary drilling tools.In other applications, like foundation drilling, DTH hammers can be used in hole size up to 1,000 mm (39-3/8").

Usually, the smallest hole diameter a DTH hammer can drill is its nominal size, for example, a 4"hammer would drill a 4" (100/102 mm) hole.The limiting factor is the outside diameter of the hammer, because, as hole diameter reduces, airflow is restricted.Maximum hole size for production drilling is the nominal hammer size plus 1"for 5" and smaller hammers and plus 2 for 6" and bigger hammers, for example, for a 4" hammer the maximum hole size is 5" (127/130mm) while for a 8"hammer the maximum hole size is 10" (254mm).

FAQ:
Why choose us?
1) We have more than 20 years of researching,developing, manufacturing and exporting
high quality rock drilling equipments and penumatic tools to the global market.
2) High quality compatible with , Atlas Copco, Ingersoll Rand etc...
3) Reasonable price
4) Excellent service.
5. Which port do you shipping from?
We usually ship container from Shanghai port.Guangzhou,ShenZhen port is available too.
6. Can you accept OEM & ODM ?
Yes, both of them are acceptable.
7. What is your minimum order quantity?
Our MOQ are 1pc or 1 complete set, the price may rely on the order quantity.
8. What is your payment term?
We can accept L/C, D/A, D/P, T/T, , MoneyGram.
9. How about the delivery time?
It depends,generally it takes about 15-25.If have stocks,Usually only 5-10 days if in stock.

Quality warranty:
Our hammers are made of high quality steel and all spares are inspected strictly before shipping. We have quickly responses for your complaint and suggestion.
Package:
Using ply-wooden cases and pallet for exporting to protect products and avoid the damagement during transportation. Also we can customize package according to your special requests.
Transportation:
By air, By Express or By sea according to your requests