Hard Formations

T38/R38 Heat-Inserted Multi-Button Bit for Mining

• SizeT38 or R38 nominal 38 mm class (about 1.50 in); hole gauge not stated
• ConnectionSeparate T38 or R38 models

89–102 mm GT60 Thread Button Bit for Tunnel Drilling

• Size89–102 mm (3.50–4.02 in); listed 89 and 102 mm
• ConnectionGT60

90 mm N3 Low-Pressure DTH Button Bit for Mining

• Size90 mm (3.54 in); N3 impactor family
• ConnectionN3 DTH shank family

165 mm Mission60 DTH Button Bit for Water Wells

• Size165 mm (6.50 in); Mission60 hammer family
• ConnectionMission60 DTH shank family

158 mm Six-Inch High-Pressure DTH Bit for Water Wells

• Size158 mm (6.22 in); source also states six-inch class
• ConnectionHigh-pressure DTH shank not stated

Drill Bit Selection for Mining Exploration

Hard-Rock Geothermal Drilling Bit and Parameter Strategy

Selecting Drill Bits for Geothermal Drilling

How to Choose Drill Bits for Construction Drilling

Hard Formation Drill Bit Selection for Granite, Basalt, and Quartzite

Selecting Drill Bits for Hard-Rock Mining Exploration