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Tricone Drill Bits

SHAREATE TOOLS LTD.

mining tricone bit is mainly used in large open-pit mining operations,

such as open-pit coal mine, copper mine, molybdenum mine, iron ore mine and other non-ferrous metal mine.

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Drill Bit Selection Chart (Selection Based on Rock Characteristics, Compressive Strength, Friability, Etc.)
  • Drill Bit Series
  • Rock Compressive Strength(Psi)
  • Rock Compressive Strength(MPa)
  • 412/415
  • 4000-7000
  • 27-48
  • 422/425
  • 5000-8000
  • 34-55
  • 432/435
  • 6000-9000
  • 41-62
  • 442/445
  • 7000-10000
  • 48—69
  • 512/515
  • 9000-15000
  • 62-103
  • 522/525
  • 12000-19000
  • 83-131
  • 532/535
  • 15000-23000
  • 103-159
  • 542/545
  • 18000-27000
  • 124-186
  • 612/615
  • 23000-30000
  • 159-207
  • 622/625
  • 26000-34000
  • 179-234
  • 632/635
  • 29000-38000
  • 200-262
  • 642/645
  • 32000-42000
  • 221-290
  • 712/715
  • 37000-44000
  • 255-303
  • 722/725
  • 40000-48000
  • 276-331
  • 732/735
  • 43000-52000
  • 296-359
  • 742/745
  • 46000-56000
  • 317-386
  • 812/815
  • 49000-58000
  • 338-400
  • 822/825
  • 52000-62000
  • 359—427
  • 832/835
  • 55000-66000
  • 379—455
  • 842/845
  • 58000-70000
  • 400—483
Nozzle Selection Chart

Drill Pipe Connection Thread Selection Chart
Bit Diameter mm 152 171 200 216 229 251 270 279 311 349
inch 6 1/4 6 3/4 7 7/8 8 1/2 9 9 7/8 10 5/8 11 12 1/4 13 3/4
API(REG) 3 1/2 3 1/2 4 1/2 4 1/2 4 1/2 6 5/8 6 5/8 6 5/8 6 5/8 6 5/8
BECO 4 1/2 4 1/2 4 1/2 6 6 6 6 6
Drill Bit Size, Thread Connection and Recommended Make-Up Torque
Bit Size API REG Thread Make-up Torque
Inch Millimetre Inch kN/m
6 1/4 158.8 3 1/2 9.5～12.2
6 3/4 171.5 3 1/2 9.5～12.2
7 7/8 200.0 4 1/2 16.3～21.7
8 1/2 215.9 4 1/2 16.3～21.7
9 228.6 4 1/2 16.3～21.7
9 7/8 250.8 6 5/8 38～43.4
10 5/8 269.9 6 5/8 38～43.4
11 279.4 6 5/8 38～43.4
12 1/4 311.2 6 5/8 38～43.4
13 3/4 349.3 6 5/8 38～43.4
Drilling Parameter Selection Chart (Weight on Bit and Rotary Speed)
IADC Weight on Bit per Inch of Bit Diameter

(lb/in)

Rotary Speed (r/min) Cutting Structure Applications

412

415

1000—2000 90—120 Conical on gage and inner rows Designed for very soft formations with low compressive strength and high friability such as shale, soft limestone, sandstone, gravel clay, soft dolomite, coal.

432

435

1000—4000 90—120 Conical/Chisel on gage, Conical inner rows Designed for very soft formations with low compressive strength and high friability such as shale, soft limestone, sandstone, gravel clay, soft dolomite, coal.

532

535

2000—5000 80—110 Conical/Chisel on gage, Conical inner rows Designed for soft formations with low compressive strength, such as shale, soft limestone, interbedded dolomite, coal.

612

615

3000—5000 60—100 Conical/Spherical on gage, Conical inner rows Designed for high compressive strength, medium hard and abrasive formations, such as limestone, sandstone, interbedded dolomite.

632

635

3000—6000 60—100 Conical/Spherical on gage, Conical inner rows Designed for high compressive strength, medium hard and abrasive formations, such as limestone, sandstone, interbedded dolomite.

732

735

4000—7000 60—90 Spherical on gage, Conical/Double spherical on inner rows Designed for high compressive strength, hard and abrasive formations, such as granite, limestone, sandstone, dolomite.

832

835

5000—8000 50—80 Spherical on gage, Double spherical on inner rows Designed for high compressive strength, hard and abrasive formations, such as magnetite quartzite, quartzite, granite.

Note: Maximum weight on bit and rotation speeds should not be applied at the same time.

Bit Failure Types and Product Selection

The common failure types for tricone bits are bearing failure, cutting structure failure, and cone body wear.

Failure types Failure image Recommendation Image
Bearing failure image066 Recommend sealed bearing image068
Broken Insert (Cutting rows) image070 Select a bit suitable for harder formation image072
Broken Insert (Gage rows) image074 Choose the feature F for drilling in soft formation to reduce cone body wear image076
Broken Insert（Coring） 8 Choose the feature F for drilling in hard formation to reduce cone body wear image080
Shirttail and lug back wear image100 Choose the feature R for strengthened shirttail and lug back protection image101
Wear on the top of lug back image085 Choose the feature R with protection on the top of lug back image101