Drill Bit Selection and Lip Surface Shape

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Drill Bit Selection Reference Table

Stratigraphic Classification

Rock Formation Name

Abrasiveness

Drill Bit Series

HRC 55

HRC 45-50

HRC 40-45

HRC 35-40

HRC 30-35

HRC 25-30

HRC 20-25

HRC 15-20

HRC 10-15

HRC 5-10

HRC 0-0-5

Soft

Mudstone, shale, very soft sandstone, peat rock, argillaceous rock, volcanic rock, tuff, etc.

Strong

●

Medium

●

Weak

●

Medium Hard

Limestone, rhyolite, andesite, marble, hard sandstone, limonite, white mica, schist, etc.

Strong

●

Medium

●

Weak

●

Hard

Basalt, gneiss, granodiorite, hornfels, pegmatite, diabase.

Strong

●

Medium

●

Weak

●

Hard

Hard granite, conglomerate, quartzite, hard slate, rhyolite, etc.

Strong

●

Medium

●

Weak

●

Diamond Bit Lip Shape

Lip Surface Shape		Applicable rock strata and performance characteristics
Full Round		Higher diamond content in the bit face.higher penetration rate.and suitable for drilling hard rocks.
Semi-round		Even diamond distribution in the bit face,suitable for drilling medium-hard and hard rocks.or a little broken and loose formations.
Fiat		For impregnated diamond bit oniy,suitable for drilling hard abrasive rocks.
Bottom Discharge Design		Suitable for drilling sedimentary or metamorphic formations containing more powder mineraiw with high core recovery percentage,and no excessive core washout.
Stepped		Suitable for dr drilling medium-hard,broken or interbedded formations, hoie deviation can be prevented.
Tapered		Suitable for drilling soft and medium-hard formations with high penetration rate.
Serrated Profile		Suitable for drilling hard dense formations with high penetration rate.
Staggered Concentric Profile		Suitabie for drilling hard dense formations with high penetration rate under low bit weight.
GearWheel		Suitabie for drilling hard dense formations with high penetration rate.

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