IADC745 Roller Cone Bit Attached To The Drill String For Blast Hole Drilling

Click here for catalogueTCI DRILL BIT.pdf

Description of drill bit

Hard to Very-Hard Formation

Application : For use in moderately abrasive consolidated formations with compressive strength ranging between 140 – 485 Mpa such as hard limestone, quartzite, granodiorite, and medium grade metamorphic formations

Cutting structure: These bits are characterized by closely spaced conical or spherical inserts with medium to low projection. This configuration promotes good penetration rates in hard, consolidated and very abrasive formations. Smaller carbide inserts are provided on the gage and inner rows or hard metal is deposited in the nose area to contain shell erosion and improve performance.

• Compression Strength: 60,000 – 100,000 psi
• Drilling Speeds: 50 – 90 rpm
• Jet Circulation: All sizes
• Weight on Bit (WOB): 4,000 – 7,500 lbs/in of bit diamete

Roller cone bit consists of a bit body with three moveable conical rollers equipped with cemented carbide inserts.

The idea is the crush the rock by rolling the inserts against the rock with appropriate rotation speed and feed force.

Three types of cemented carbide inserts are used for roller type bits being Chisel, Conical, and Hemispherical.

Carbide inserts are distributed over the three rollers in such a manner that the entire bottom of the hole is worked on when the drill bit is rotated. Roller bits for hard and abrasive rock generally have spherical cemented carbide inserts closely spaced.

Roller bits for softer rock may have the chisel and conical carbide teeth or quality milled steel teeth as the cutters.

A roller bit will utilize nozzles from which the compressed air escapes to lift the cuttings from the bottom of the hole.

All bits the above are manufactured according to strict standards, set forth by the American Petroleum Institute (API).

And classified according to characteristics set forth by the International Association of Drilling Contractors (IADC).

How to read an IADC Code properlyHow To Read IADC 1.pdf

Main Products We Provide

We mainly provide Tricone Bits(TCI Drill Bits) for open pit mining.

a). Type: Tungsten Carbide Insert (TCI)

b). Formation Application: Soft to Hard Formation

c). Size Available: 7 7/8''~26''

d). Popular IADC Code: IADC545,645,725,735,745,825,835

Don’t see the bit you are looking for? Give us a call, we can customize any bit to fit your unique circumstances.