Steel Tooth Bit Milled tooth bit tricone bit?SG Series?

SG Series Bit Diameter（Inch）

Thread（API REG）

3 7/8?、4 3/8?、4 1/2?、4 5/8?、5 1/4?、6?、6 3/8?、6 1/2?

3 1/2?

7 1/2?、8 1/2?、

4 1/2?

IADC CODE

Applicable Formations

Recommended Drilling Parameters

WOB (kn/mm)

（bit dia）

Speed r/mm

**7

soft formation with low compressive strength and high drillability，such as softshale、clay、salt,etc

0.***0.*0

**0~*0

**7、**1

soft formation with low compressive strength and high drillability，such as softshale、clay、salt,soft limestone ,etc.

0.***0.*0

**0~*0

**7、**1

soft to medium soft formation or a hard interlayer with low compressive strength,such as anhydrite、soft limestone、sandstone,etc

0.*5~0.*0

**0~*0

**7、**7、**1

medium hard formation ,thick hard interlayer with High compressive strength,such as Hard shale、Limestone、sandstone、dolostone,etc

0.*5~1.*5

**0~*0

**7、**7

soft formation with low compressive strength and high drillability，such as softshale、clay、salt,soft limestone ,etc.

0.*5~1.*0