hot-pressed diamond drill bit(double tube)

The hot-pressed diamond drill bit has high hardness abrasion resistance and toughness.

1.size OD 56mm,59mm,75mm,91mm,110mm,130mm,150mm,168mm,200mm,219mm

are generally available for stock, other standard sizes are also ordered.

2.wooden cases can be used as required.

3.

Hot-pressed Diamond Drill Bit Hardness and Rock Drillability Grades Form
Rock Drillability Grade	Bit Hardness (HRC)	Rock Classifications
1~4	15° , 20° , 22° ~25°	Silty mudstone, carbonaceous mudstone, siltstone, medium-grained sandstone, through amphibolite, lamprophyre, etc.
5	20° , 22° ~25° , 26° ~28°	Silicified siltstone, talc through amphibolite, olive marble, white marble, quartz diorite porphyry, black schist, diopside marble rock, marble and so on.
6	20° , 22° ~25° , 26° ~28	Black hornblende plagioclase gneiss, white plagioclase gneiss, quartz, dolomite marble, black marble, mica, dolomite, alteration angle along glittering rocks, amphibolite granulite, amphibolite, biotite quartz schist, angular rock, garnet diopside skarn, biotite dolomite marble, ect.
7	20° , 22° ~25° , 26° ~28	White plagioclase gneiss, quartz and dolomite marble, diopside petrochemical diorite, mixed carbide powder rocks, biotite hornblende anorthosite, pyroxenite through, dolomite marble, altered quartz diorite porphyry, quartz diorite, quartz biotite schist.
8	30° ~32° , 33° ~35°	Granite, skarn diorite, garnet skarn, quartz diorite porphyry, quartz amphibolite, biotite amphibolite rocks, mixed pegmatite, biotite granite, plagioclase diorite, mixed gneiss, tuff, rock and other mixed light particles.
9	30° ~32° , 33° ~35°	Carbide powder mixed rock, granite, plagioclase rock, mixed diorite, K-feldspar pegmatite, plagioclase migmatites, diorite, quartz diorite, porphyritic granite.
10	30° ~32° , 33° ~35°	Silicified marble rocks, skarn, mixed-plagioclase gneiss, albite porphyry, feldspar pegmatite, amphibolite rocks, felsic migmatitic amphibolite, anorthosite, granite siliceous tuff lava gravel.
11	5° ~8° , 8° ~10° , 10° , 15° , 22° ~25°	Tuff, tuff fused quartz chert, dacite, etc.
12	5° ~8° , 8° ~10° , 10° , 15° , 22° ~25°	Quartz chert, chalcedony, melting tuff, pure quartzite, etc.
Information above is for reference only, and Drill bit should be selected accordingly.

hot-pressed diamond drill bit(double tube)