Concave 3in Types Of Drilling Bits For Oil Wells Manganese Coal Mining

Place of Origin China
Brand Name Hainaisen
Certification API & ISO 9001
Model Number 75NA43
Minimum Order Quantity 10 pieces
Price To be negotiable
Packaging Details customized
Delivery Time 5-7 business days
Payment Terms T/T, L/C
Supply Ability 300pcs per day

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Product Details
Name Coal Mining Drill Bit PDC Bit Body Type High Manganese Steel
Primary PDC Cutter Size 1913 Number Of Blade 3
Quality High Level Process Roll Forged & Fully Ground
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concave types of drilling bits for oil wells


3in types of drilling bits for oil wells


Manganese coal mining bit

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Product Description

3inch Coal Mining Drill Bit Concave Drill Bit Water Drill Bit PDC Bit



1. The top surface of the bit is shallow with 3 small nozzles. and in the circumferential direction of the blades there are 3 big nozzles. The nozzles can rinse the bit and clean the rock debris away from the bottom of the hole quickly.Avoiding secondary fragmentation. They can also prevent the bit from being wrapped by the mud.

2. The blade gauge surface is inlaid with an alloy gauge strip, which makes the drill bit gauge wear resistant, durable, and has a long service life;

3. The blade cloth teeth are parallel and uniform, and the cutting teeth are made of 1308 composite high-performance composite sheet, which has good abrasiveness, fast drilling speed and strong impact resistance.

4. The back inclination angle of the main cutting teeth of the drill bit can be adjusted between 16° and 20°, with strong aggressiveness, high ROP and strong stability.


Size 75mm
Model number 75NA43
Body type High Manganese Steel
Number of blade 3
Primary PDC cutter size 1913
Number of nozzle 5
Diameter of nozzle 11.5
Gauge length 33
API connection 50 with stingers
Suitable formation F≤12
Application Mining&Coal&Well
Quality High Level
Package Corrugated carton
MOQ 10 Pieces
Certificate ISO 9001
Customized Size Yes

Concave 3in Types Of Drilling Bits For Oil Wells Manganese Coal Mining 0


Our drills will ship within 5 days after 50% full payment is confirmed. The drill bits will be shipped by sea or air as your request. And if you have any other questions, please contact us freely. Thanks!

Concave 3in Types Of Drilling Bits For Oil Wells Manganese Coal Mining 1

Our Principle

We adhere to the principles of high quality, high quality service, and innovation. We also insist on providing efficient products and quality services. If you are interested in our drills, please feel free to contact us. We are looking forward to cooperating with you!




1. Who are we?
We are a drill bit manufacturer started from 2013. Our main prodcuts are pdc drill bit for oil&gas, coal mining drill bit, core bit, pdc cutters and other types of pdc bits.


2. How can we guarantee the product quality?
We provide pre-production sample before mass production.
We provide final inspection before shipment.

3: How about your products?
All our activities are accredited to ISO9001: 2008, both in products and services, at the same time, mature production technology ensuring the quality satisfy international request.We have many high quality prducts (the more information).


4: What is your trade terms?
We offer EXW, FOB, CIF.


5: What is your payment terms? 
Payment terms: normally 30% deposit, balance 70% before shipment. 

Payment methods: T/T, L/C.