7° Tapered Drill Bits

7° Tapered Drill Bit is a kind of drill bit that is used in conjunction with the down-the-hole impactor. It has the characteristics of straight drilling, fast drilling and deep hole drilling. And it is widely used in mining, quarry, hydropower engineering, and drilling water wells.
分类：
 Carbide Button Choose Guide
Product Spherical Button Ballistic Button Ogive Button
Applicable types Regular type Retrac type Regular type Retrac type Especially suitable for pneumatic rock driller
Hard Rock ★ ★ ★ ★
Medium Hard Rock ★ ★ ★ ★
Soft Rock ★
Abrasive Rock ★ ★ ★ ★
Non-Abrasive Rock ★ ★
Homogeneous Rock ★ ★ ★
Fissure Rock ★

Remarks:Other specification bits are available according to customer’s requirements.

 Physical Performance
Items Measured Data
GF20B GF20G
D(g/cm3) 14.94 14.97
HC(Oe) 143 140
σs 9.1 8.8
Ms/% 95 92
TRS(MPa) 3300 3362
POROSITY A02B00C00 A02B00C00
ETA Phase None None
Grain size(μm) 2.5 3
MAX 20 14
Structure Patches None None
KIC None None
HRA 90.3 90.4
HV30 1440 1440

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