Bit type

Normal WOB
KN/mm
(bit dia.)

Rotary
Speed
(rpm)

Cutting structure
Main features

Applicable formation

S412

0.70

120-60

The insert bit conical spherical compacts in inner row and in outer row

Soft with low compressive strength and high drillability, such as shale, soft limeStone(Juparana Classic.), soft sandStone(Juparana Classic.), rudaceous clay, soft dolomite, salt bed and coal bed, etc.

S432

0.70-1.00

100-60

The insert bit, wedge compacts in inner row and in out row

Medium hard with high compressive strength, such as shale, soft limeStone(Juparana Classic.), dolomite with stringers and coal bed, etc.

S532

0.70-1.00

100-60

Wedge compacts in inner row, dull wedge or wedge compacts in outer row

Soft formation with low compressive strength, such as shale, soft limeStone(Juparana Classic.), dolomite with stringers and coal bed, etc.

S612

0.70-1.00

100-60

Conical spherical compacts in inner row, dull wedge compacts in outer row

Medium hard with high compressive strength and thick & hard stringers, such as hard shale, limeStone(Juparana Classic.), sandStone(Juparana Classic.), dolomite and coal bed, etc.

S632

0.8-1.00

100-60

Conical spherical compacts in inner row, dull wedge compacts in outer row

Medium hard with high compressive strength and high abrasiveness, such as limeStone(Juparana Classic.), sandStone(Juparana Classic.), dolomite and chert, etc.

S732

0.80-1.00

90-60

Conical spherical or bullet shape compacts in inner row, dull wedge compacts in outer row

Hard formation with high compressive strength and high abrasiveness, such as Granite(Labrador Antico), limeStone(Juparana Classic.), sandy shale, dolomite and chert, etc.

S832

1.10-1,30

90-60

Bullet shape or ball-nose compacts in inner row, dull wedge compacts in outer row

Hard formation with high compressive strength and high abrasiveness, such as magnetic quartzite and Granite(Labrador Antico), etc.