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Tricone Bits
8 1/2in IADC 127 (215.9mm)
IADC:127
ID:215.9
Design Specifications
IADC Code 127
Type Steel tooth
Number of cones 3
Number of nozzles 3
Bearing type Rubber
Seal type Slide
Center water hole NO
Tooth shape NO
Thread Connection 4 1/2" API REG Pin
Type of reinforcement Alloy teeth
Weight 45Kg
package Wooden box
Operating Parameters
Bit Pressure: 0.4 ~ 0.85 KN
Rotary Speed: 60 ~ 180 r/min
Pumping Pressure: 8 ~ 18 Mpa
Sediment Concentration: < 0.5%

The above parameters are only for reference. Optimized parameters are determined by drilling process and lithology of formations on site.

8 1/2inch IADC 127 mining drill bit or air rock drill or oil drill head

8 1/2inch IADC 127 mining drill bit or air rock drill or oil drill head

tricone bit nozzle and assembled size       

Bit  diameterNozzle outer diameterassembled lengthNozzle exit diameter (inner diameter)
inmmmmmmmm
3 1/2~5 1/288.9~139.720.317.54~10
5 5/8~7 3/8142.9~187.323.619.05~16
7 1/2~8 1/4190.5~209.629.821.07~18
8 3/8~14 5/8212.7~371.533.027.08~20
≥14 3/4≥374.640.927.010~22
Note: the assembled lenght is length from nozzle inlet to retaining ring groove

Applicable formations:

Soft and soft sticky-Highly drillable formations such as clay, marl, gumbo and unconsolidated sands.

O-ring sealed journal bearing

Journal bearing structure with head bearing hardfaced and cone bearing silver plated to improve load capacity and anti-galling ability of the bearing. More wear and high-temperature resistant highly saturated Buna-N rubber O-ring is used to improve reliability. Larger O-ring section reduces pressure on the seal, and the boss at outer end of the seal is also helpful for reliability of the seal.Surface of the thrust bearing couple are specially treated for decreasing friction and increasing rigidness, load capacity of the bit and anti-galling ability of the bearing are consequently improved.

Cutting structure

Hardfaced gage and tooth surfaces.

Hardfacing on shirttail

This feature can provide better protection for seal and bearing to extend the bit’s service life.

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